CN103061333B - Split screw pile and welding method thereof - Google Patents
Split screw pile and welding method thereof Download PDFInfo
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- CN103061333B CN103061333B CN201310005075.4A CN201310005075A CN103061333B CN 103061333 B CN103061333 B CN 103061333B CN 201310005075 A CN201310005075 A CN 201310005075A CN 103061333 B CN103061333 B CN 103061333B
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- 238000003466 welding Methods 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000004140 cleaning Methods 0.000 claims abstract description 5
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 36
- 229910000679 solder Inorganic materials 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 15
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 13
- 239000010962 carbon steel Substances 0.000 claims description 13
- 238000010891 electric arc Methods 0.000 claims description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 12
- 241000826860 Trapezium Species 0.000 claims description 8
- 229910000870 Weathering steel Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 238000003032 molecular docking Methods 0.000 claims description 8
- 239000011229 interlayer Substances 0.000 claims description 6
- 239000003351 stiffener Substances 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- 239000011810 insulating material Substances 0.000 claims description 4
- 238000010583 slow cooling Methods 0.000 claims description 4
- 241000293001 Oxytropis besseyi Species 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000011218 segmentation Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 210000001503 joint Anatomy 0.000 abstract 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 abstract 1
- 229910052721 tungsten Inorganic materials 0.000 abstract 1
- 239000010937 tungsten Substances 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 18
- 239000010959 steel Substances 0.000 description 18
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 229910052739 hydrogen Inorganic materials 0.000 description 6
- 239000001257 hydrogen Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 208000037656 Respiratory Sounds Diseases 0.000 description 3
- 238000005275 alloying Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 229910001562 pearlite Inorganic materials 0.000 description 3
- 238000007778 shielded metal arc welding Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/56—Screw piles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
- B23K33/004—Filling of continuous seams
- B23K33/006—Filling of continuous seams for cylindrical workpieces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a split screw pile and a welding method thereof. The split screw pile comprises a pile body and a submerging tip, which are split. The submerging tip comprises a sharp end and a truncated-cone-shaped tail. An insert part of the submerging tip is inserted into a socket hole of the pile body so that a circular welding groove is formed between a slant part of the submerging tip and an open end of the pile body. The pile body is welded to the circular welding groove of the submerging tip to form an integrated structure. The welding method of the split screw pile includes the steps of firstly, performing connector butt welding; secondly, cleaning before welding; thirdly, preheating; fourthly, welding, namely performing manual gas tungsten arc welding to complete bottoming by nickel-base welding wires ERNiCrMo-3, and performing manual arc welding to complete filling and capping; and fifthly, thermally treating after welding. Therefore, the effective welding between the Q235B pile body and the 12Cr1MoV submerging tip is achieved, butt joint of connectors is simple and reliable, operating efficiency is improved, effective welding area is increased, weld strength is increased and processing and production costs are lowered.
Description
Technical field
The present invention relates to a kind of spiral ground pile, be specifically related to a kind of split type spiral ground pile and welding method thereof.
Background technology
In engineering construction, the range of application of pile is comparatively large, and it is widely used in the middle of the Building class such as photovoltaic, wind energy industry.Pile is the connection agent structure for being connected ground that building generally adopts with steel frame construction industry.Existing spiral ground pile all adopts integral structure, and pile body is tubular structure, and pile body periphery is connected with helical blade, and pile body front end is sharp structure.Whole spiral ground pile can only be applicable to the soil of single characteristic, when running into other characteristic soil, this type of spiral ground pile just loses use value, limit the scope of application of pile on the one hand, on the other hand when adopting the existing spiral ground pile frozen soil geology very high to hardness to construct, needing spiral ground pile entirety to adopt superhard material, there is the high problem with wasting resource of cost.As Chinese Patent Application No. " 201110194483.X " discloses a kind of prefabricated rotary drilling compound pile and construction method thereof, comprise pile body and pile top, described pile top is taper, described pile body external surface is provided with its horizontal slice acutangulate blade, described blade is at least a slice, described blade is helical form, flaabellum shape or colter shape, it axially distributes along it continuously or intermittently at pile body external surface, on described pile body external surface, interval arranges spiral plate, described spiral plate is arranged within the scope of pile body external surface 360 degree continuously or intermittently, pile body is connected with pile top by flange or solder design.But this spiral ground pile adopts the welding method of routine, when the frozen soil geology very high to hardness is constructed, needs are overall adopts superhard material (as 12Cr1MoV), there is the high problem with wasting resource of cost.
In order to solve the problem, inventor proposes to be the pile body of Q235 carbon steel and material by material to be that the pile top of 12Cr1MoV steel is welded, to reach the object reduced costs first.But the groove type due to the welding point of routine is generally V-type or U-shaped groove, need all to carry out retaining wall on slope to pile body and pile top, there is processing and docking trouble, efficient weld area is little, weld strength is poor and the inefficient shortcoming of welding job.Meanwhile, 12Cr1MoV steel belongs to pearlite heatproof steel, due to phosphorus content and alloying element more, easily there is hardened structure in weld dimensions, plasticity, toughness are reduced, weldability be deteriorated, when weldment rigidity and joint stress larger time, easily crack.Because the chemical component difference of 12Cr1MoV steel and Q235B carbon steel is very large, therefore their welding belongs to different steel weld, reliable welding point to be obtained under the condition of melting welding, there is many problems: 1, due to both thermal conductivities and the difference of specific heat capacity, make both fusings asynchronous, molten bath formed and corrupt split bad, cause weld seam crystallization condition to degenerate, Weld Performance and cob webbing.2, both linear expansion coeffcients are different, and cause them being formed in the cooling procedure after being welded to connect, the amount of contraction of weld seam both sides is different, causes welding point to occur complicated high-stress state, and then accelerates the generation of crackle.3, there is the problem of welding dilution and formation transition zone.
In summary it can be seen, adopt the structure of traditional welding point and welding procedure to carry out these two kinds of dissimilar steel welding effective welding that can not realize between these two kinds of dissimilar steel, therefore need the structure of Welded Joints and welding procedure to improve.
Summary of the invention
For the deficiencies in the prior art, first object of the present invention is to provide a kind of split type spiral ground pile, this spiral ground pile bores ground tip by Q235B carbon steel pile body and 12Cr1MoV heat resisting steel and is welded into overall structure, docking during welding between joint is simple and reliable, increase work efficiency, increase efficient weld area, improve the weld strength after welding, the effective welding between these two kinds of dissimilar steel can be realized, reduce processing and cost of production.
Second object of the present invention is the welding method in order to provide a kind of split type spiral ground pile, and this welding method can prevent the generation of commissure crackle; Decrease Carbon diffusion; Alleviate intercrystalline corrosion, achieve the effective welding between Q235B carbon steel pile body and 12Cr1MoV heat resisting steel brill ground tip.
For realizing above-mentioned first object, the present invention adopts following technical scheme:
A kind of split type spiral ground pile, comprise sharp cone and the conical brill ground tip of split setting, described pile body outer race is provided with the helical blade of helically shoestring; It is characterized in that: described brill ground tip comprises point and truncated cone-shaped afterbody; Described truncated cone-shaped afterbody comprises the inclined plane part that the Plug Division that coordinates with pile body internal face and diameter are greater than described Plug Division; Described Plug Division of boring ground tip is interspersed in the sleeve joint hole of pile body, makes to form annular solder groove between the inclined plane part of brill ground tip and the open end of pile body, and the axial cross section of described annular solder groove is right-angled triangle or right-angled trapezium; Described pile body is welded into overall structure with brill ground tip at annular solder groove place.
Described pile body is the pile body adopting Q235B carbon steel material, the chemical composition (%) of Q235B carbon steel: C:0.12 ~ 0.20, Si :≤0.30, Mn:0.30 ~ 0.70, S :≤0.045, P :≤0.045, Cr: allow residual content≤0.030, Ni: allow residual content≤0.030, Cu: allow residual content≤0.030.
The described ground tip that bores is the brill ground tip adopting 12Cr1MoV weathering steel material, the chemical composition (%) of 12Cr1MoV weathering steel: C:0.07 ~ 0.15, Si:0.18 ~ 0.37, Mn:0.41 ~ 0.70, Cr:0.90 ~ 1.20, Mo:0.25 ~ 0.35, V:0.15 ~ 0.30.
Realizing one embodiment of the present invention is: the section area of described annular solder groove is more than or equal to 8mm2.
Realizing one embodiment of the present invention is: described pile body end is provided with for the flange arrangement fixing with outer body structure or tight fixed bolt structure.
Realizing one embodiment of the present invention is: described pile body rearward end is provided with arc stiffener and runs through the through hole of stiffener and pile body.
Realizing one embodiment of the present invention is: described point comprises the cut formula pointed cone of front end and the cutting edge of both sides.
Realizing one embodiment of the present invention is: described point is also provided with circular row water hole.
Realizing one embodiment of the present invention is: described helical blade is endless spiral or segmentation helical blade.
For realizing above-mentioned second object, the present invention adopts following technical scheme:
A welding method for split type spiral ground pile, is characterized in that carrying out according to the following steps:
1) joint docking: the Plug Division of boring ground tip is interspersed in the sleeve joint hole of pile body, make to form annular solder groove between the inclined plane part of brill ground tip and the open end of pile body, the axial cross section of described annular solder groove is right-angled triangle or right-angled trapezium; Wherein, described pile body is the pile body adopting Q235B carbon steel material, and described brill ground tip is the brill ground tip adopting 12Cr1MoV weathering steel material;
2) preweld cleaning: greasy dirt and the filth on the surface of pile body and brill ground tip butt welding part are removed;
3) preheating: by pile body with bore ground tip 150 ~ 180 DEG C are preheated to welding position; Preheating is the important measures of pearlite heatproof steel welding, and preheating can be slowed down the cooling velocity of weld dimensions, is conducive to avoiding producing hardened structure, contributes to the effusion of the hydrogen of weld zone, prevent weld crack.Due to the carbon content of 12Cr1MoV steel and the content of alloying element higher, so select preheat temperature 150 ~ 180 DEG C;
4) weld: by pile body with bore ground tip and be in and horizontally rotate position and weld, select nickel-based welding wire ERNiCrMo-3, adopt GTAW (TIG) bottoming, manual electric arc welding (SMAW) filling, capping; Interlayer temperature controls at 180 ~ 200 DEG C; In whole welding process, interlayer temperature should be kept to be not less than preheat temperature;
4-1) GTAW (TIG) bottoming: adopt mass percentage to be respectively the Ar of the 80% and He of 20% as protection gas, controlling gas flow is 8 L/Min; Electric power polarity is: straight polarity direct current, and electric current is 100A, and voltage is 12V;
4-2) manual electric arc welding is filled: electric power polarity is: straight polarity direct current, and electric current is 120A, and voltage is 15V;
4-3) manual electric arc welding capping: electric power polarity is: straight polarity direct current, electric current is 120A, and voltage is 15V;
5) postweld head treatment: after welding terminates, adopts heat insulating material butt welded seam immediately and carries out covering and heat insulating near weld metal zone, making joint Slow cooling.Subsequently, then weldment entirety is heated to 760 DEG C, constant temperature, after 30 minutes, is cooled to room temperature.Postwelding carries out hidden lino removal, can eliminate or reduce the hardened structure that influence area occurs, increases plasticity and toughness, effectively reduces welding residual stress, be conducive to the effusion of diffusible hydrogen simultaneously, thus reduces cold crack tendency.
Beneficial effect of the present invention is:
1, the structure of Welded Joints of the present invention is improved, and brill ground tip is provided with truncated cone-shaped afterbody; Be interspersed in the sleeve joint hole of pile body by the Plug Division of boring ground tip, can make to form annular solder groove between the inclined plane part of brill ground tip and the open end of pile body, the docking between joint is simple and reliable, increases work efficiency; Axial cross section due to described annular solder groove is right-angled triangle or right-angled trapezium, compared with traditional groove type, can increase efficient weld area, improves the weld strength after welding, can realize the effective welding between these two kinds of dissimilar steel.Meanwhile, the present invention only needs to carry out retaining wall on slope to brill ground pointed portion, thus reduces processing and cost of production.
2, the present invention improves welding procedure, first, the present invention by pile body with bore ground tip 150 ~ 180 DEG C are preheated to welding position, can be slowed down the cooling velocity of weld dimensions, be conducive to avoiding producing hardened structure, contribute to the effusion of the hydrogen of weld zone, prevent weld crack.Secondly, the present invention selects nickel-based welding wire ERNiCrMo-3, adopt GTAW (TIG) bottoming, manual electric arc welding (SMAW) is filled, capping, and adopt Ar-He-CO2 mixed gas GTAW backing welding, namely production joint uses 80%Ar+20%He, utilize Ar gas arc stability soft, He pneumoelectric arc calorific value is large and concentrate, and increases the feature of fusion penetration, eliminates the generation of the lack of inter-run fusion defect in the welding of this dissimilar steel production joint.Finally invention has been postweld head treatment, can eliminate or reduce the hardened structure that influence area occurs, increase plasticity and toughness, effectively reduce welding residual stress, be conducive to the effusion of diffusible hydrogen simultaneously, thus reduce cold crack tendency.
In sum, the present invention is improved by the structure of Welded Joints and welding procedure, can prevent the generation of commissure crackle; Decrease Carbon diffusion; Alleviate intercrystalline corrosion, achieve the effective welding between Q235B carbon steel pile body and 12Cr1MoV heat resisting steel brill ground tip, the breaking strength of joint is up to 735 MPa, and the mechanical property in welding line joint region is better than mother metal; Display is observed in metallographic structure, and joint microstructure is fine and close, and crystal grain is tiny; Joint fracture SEM is observed and is shown, fracture zone dimple is large and dark, in ductile rupture feature, in joint there are no being mingled with, the defect such as pore and micro-crack.Meanwhile, docking when the present invention also has a welding between joint is simple and reliable, improves operating efficiency, adds efficient weld area, improve the weld strength after welding, reduces the advantage of processing and cost of production.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of split type spiral ground pile of the present invention.
Fig. 2 is pile body of the present invention and structural representation during brill ground tip employing welding connecting mode.
Fig. 3 is the partial enlarged drawing of weld A in Fig. 2.
Detailed description of the invention
Specific embodiment:
Below, by reference to the accompanying drawings and detailed description of the invention, the present invention is described further:
With reference to Fig. 1-Fig. 3, the split type spiral ground pile described in the present embodiment, comprise sharp cone 2 and the conical brill ground tip 1 of split setting, the external surface of the body 201 of described pile body 2 is arranged with the helical blade 202 of helically shoestring; Described brill ground tip 1 comprises point 102 and truncated cone-shaped afterbody 101; Described truncated cone-shaped afterbody 101 comprises the inclined plane part 101b that the Plug Division 101a that coordinates with pile body 2 internal face and diameter are greater than described Plug Division; The described Plug Division 101a boring ground tip is interspersed in the sleeve joint hole of pile body 2, make to form annular solder groove 3 between the inclined plane part 101b of brill ground tip 1 and the open end 203 of pile body 2, the axial cross section of described annular solder groove 3 is right-angled triangle or right-angled trapezium; Described pile body is welded into overall structure with brill ground tip at annular solder groove place.
In the present embodiment:
Described pile body 2 is the pile body adopting Q235B carbon steel material, the chemical composition (%) of Q235B carbon steel: C:0.12 ~ 0.20, Si :≤0.30, Mn:0.30 ~ 0.70, S :≤0.045, P :≤0.045, Cr: allow residual content≤0.030, Ni: allow residual content≤0.030, Cu: allow residual content≤0.030.
The described ground tip 1 that bores is the brill ground tip adopting 12Cr1MoV weathering steel material, the chemical composition (%) of 12Cr1MoV weathering steel: C:0.07 ~ 0.15, Si:0.18 ~ 0.37, Mn:0.41 ~ 0.70, Cr:0.90 ~ 1.20, Mo:0.25 ~ 0.35, V:0.15 ~ 0.30.
The section area of described annular solder groove 3 is more than or equal to 8mm2.Described pile body 2 end is provided with for the flange arrangement fixing with outer body structure or tight fixed bolt structure 204.Described pile body rearward end is provided with arc stiffener and runs through the through hole of stiffener and pile body.Described point comprises the cut formula pointed cone of front end and the cutting edge of both sides.Described point 102 is also provided with circular row water hole 102a.Described helical blade is endless spiral or segmentation helical blade.
A welding method for split type spiral ground pile, carry out according to the following steps:
1) joint docking: the Plug Division of boring ground tip is interspersed in the sleeve joint hole of pile body, make to form annular solder groove between the inclined plane part of brill ground tip and the open end of pile body, the axial cross section of described annular solder groove is right-angled triangle or right-angled trapezium; Wherein, described pile body is the pile body adopting Q235B carbon steel material, and described brill ground tip is the brill ground tip adopting 12Cr1MoV weathering steel material;
2) preweld cleaning: greasy dirt and the filth on the surface of pile body and brill ground tip butt welding part are removed;
3) preheating: by pile body with bore ground tip 150 ~ 180 DEG C are preheated to welding position; Preheating is the important measures of pearlite heatproof steel welding, and preheating can be slowed down the cooling velocity of weld dimensions, is conducive to avoiding producing hardened structure, contributes to the effusion of the hydrogen of weld zone, prevent weld crack.Due to the carbon content of 12Cr1MoV steel and the content of alloying element higher, so select preheat temperature 150 ~ 180 DEG C;
4) weld: by pile body with bore ground tip and be in and horizontally rotate position and weld, select nickel-based welding wire ERNiCrMo-3, adopt GTAW (TIG) bottoming, manual electric arc welding (SMAW) filling, capping; Interlayer temperature controls at 180 ~ 200 DEG C; In whole welding process, interlayer temperature should be kept to be not less than preheat temperature;
4-1) GTAW (TIG) bottoming: adopt mass percentage to be respectively the Ar of the 80% and He of 20% as protection gas, controlling gas flow is 8 L/Min; Electric power polarity is: straight polarity direct current, and electric current is 100A, and voltage is 12V;
4-2) manual electric arc welding is filled: electric power polarity is: straight polarity direct current, and electric current is 120A, and voltage is 15V;
4-3) manual electric arc welding capping: electric power polarity is: straight polarity direct current, electric current is 120A, and voltage is 15V;
5) postweld head treatment: after welding terminates, adopts heat insulating material butt welded seam immediately and carries out covering and heat insulating near weld metal zone, making joint Slow cooling. and subsequently, then weldment entirety is heated to 760 DEG C, constant temperature, after 30 minutes, is cooled to room temperature.Postwelding carries out hidden lino removal, can eliminate or reduce the hardened structure that influence area occurs, increases plasticity and toughness, effectively reduces welding residual stress, be conducive to the effusion of diffusible hydrogen simultaneously, thus reduces cold crack tendency.
Carry out test specimen welding according to said welding method, test specimen, after visual inspection, magnetic powder inspection and x-ray inspection are qualified, test specimen intercept mechanical property sample, metal lographic examination sample is tested.Assay is in table 1 and table 2.
Table 1 joint mechanical property
Table 2 metallographic structure
Result shows, tension failure region occurs in mother metal side, and the breaking strength of joint is up to 735 MPa, and the mechanical property in welding line joint region is better than mother metal; Display is observed in metallographic structure, and joint microstructure is fine and close, and crystal grain is tiny; Joint fracture SEM is observed and is shown, fracture zone dimple is large and dark, in ductile rupture feature, in joint there are no being mingled with, the defect such as pore and micro-crack.
For a person skilled in the art, according to technical scheme described above and design, other various corresponding change and distortion can be made, and all these change and distortion all should belong within the protection domain of the claims in the present invention.
Claims (8)
1.
a kind of split type spiral ground pile, comprise sharp cone and the conical brill ground tip of split setting, described pile body outer race is provided with the helical blade of helically shoestring; It is characterized in that: described brill ground tip comprises point and truncated cone-shaped afterbody; Described truncated cone-shaped afterbody comprises the inclined plane part that the Plug Division that coordinates with pile body internal face and diameter are greater than described Plug Division; Described Plug Division of boring ground tip is interspersed in the sleeve joint hole of pile body, makes to form annular solder groove between the inclined plane part of brill ground tip and the open end of pile body, and the axial cross section of described annular solder groove is right-angled triangle or right-angled trapezium; Described pile body is welded into overall structure with brill ground tip at annular solder groove place;
the welding method of split type spiral ground pile, carry out according to the following steps:
1) joint docking: the Plug Division of boring ground tip is interspersed in the sleeve joint hole of pile body, make to form annular solder groove between the inclined plane part of brill ground tip and the open end of pile body, the axial cross section of described annular solder groove is right-angled triangle or right-angled trapezium; Wherein, described pile body is the pile body adopting Q235B carbon steel material, and described brill ground tip is the brill ground tip adopting 12Cr1MoV weathering steel material;
2) preweld cleaning: greasy dirt and the filth on the surface of pile body and brill ground tip butt welding part are removed;
3) preheating: by pile body with bore ground tip 150 ~ 180 DEG C are preheated to welding position;
4) weld: by pile body with bore ground tip and be in and horizontally rotate position and weld, select nickel-based welding wire ERNiCrMo-3, the bottoming of employing GTAW, manual electric arc welding filling, capping; Interlayer temperature controls at 180 ~ 200 DEG C;
4-1) GTAW bottoming: adopt mass percentage to be respectively the Ar of the 80% and He of 20% as protection gas, controlling gas flow is 8 L/Min; Electric power polarity is: straight polarity direct current, and electric current is 100A, and voltage is 12V;
4-2) manual electric arc welding is filled: electric power polarity is: straight polarity direct current, and electric current is 120A, and voltage is 15V;
4-3) manual electric arc welding capping: electric power polarity is: straight polarity direct current, electric current is 120A, and voltage is 15V;
5) postweld head treatment: after welding terminates, adopts heat insulating material butt welded seam immediately and carries out covering and heat insulating near weld metal zone, making joint Slow cooling; Subsequently, then weldment entirety is heated to 760 DEG C, constant temperature, after 30 minutes, is cooled to room temperature.
2.
the split type spiral ground pile of one according to claim 1, is characterized in that: the section area of described annular solder groove is more than or equal to 8mm2.
3.
the split type spiral ground pile of one according to claim 1, is characterized in that: described pile body end is provided with for the flange arrangement fixing with outer body structure or tight fixed bolt structure.
4.
the split type spiral ground pile of one according to claim 1, is characterized in that: described pile body rearward end is provided with arc stiffener and runs through the through hole of stiffener and pile body.
5.
the split type spiral ground pile of one according to claim 1, is characterized in that: described point comprises the cut formula pointed cone of front end and the cutting edge of both sides.
6.
the split type spiral ground pile of one according to claim 1, is characterized in that: described point is also provided with circular row water hole.
7.
the split type spiral ground pile of one according to claim 1, is characterized in that: described helical blade is endless spiral or segmentation helical blade.
8.
the welding method of a kind of split type spiral ground pile according to claim 1, is characterized in that carrying out according to the following steps:
1) joint docking: the Plug Division of boring ground tip is interspersed in the sleeve joint hole of pile body, make to form annular solder groove between the inclined plane part of brill ground tip and the open end of pile body, the axial cross section of described annular solder groove is right-angled triangle or right-angled trapezium; Wherein, described pile body is the pile body adopting Q235B carbon steel material, and described brill ground tip is the brill ground tip adopting 12Cr1MoV weathering steel material;
2) preweld cleaning: greasy dirt and the filth on the surface of pile body and brill ground tip butt welding part are removed;
3) preheating: by pile body with bore ground tip 150 ~ 180 DEG C are preheated to welding position;
4) weld: by pile body with bore ground tip and be in and horizontally rotate position and weld, select nickel-based welding wire ERNiCrMo-3, the bottoming of employing GTAW, manual electric arc welding filling, capping; Interlayer temperature controls at 180 ~ 200 DEG C;
4-1) GTAW bottoming: adopt mass percentage to be respectively the Ar of the 80% and He of 20% as protection gas, controlling gas flow is 8 L/Min; Electric power polarity is: straight polarity direct current, and electric current is 100A, and voltage is 12V;
4-2) manual electric arc welding is filled: electric power polarity is: straight polarity direct current, and electric current is 120A, and voltage is 15V;
4-3) manual electric arc welding capping: electric power polarity is: straight polarity direct current, electric current is 120A, and voltage is 15V;
5) postweld head treatment: after welding terminates, adopts heat insulating material butt welded seam immediately and carries out covering and heat insulating near weld metal zone, making joint Slow cooling; Subsequently, then weldment entirety is heated to 760 DEG C, constant temperature, after 30 minutes, is cooled to room temperature.
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| CN201310005075.4A CN103061333B (en) | 2013-01-07 | 2013-01-07 | Split screw pile and welding method thereof |
| PCT/CN2013/070520 WO2014106358A1 (en) | 2013-01-07 | 2013-01-16 | Split screw pile and welding method thereof |
| JP2014555063A JP2015507109A (en) | 2013-01-07 | 2013-01-16 | Separate spiral pile and its welding method |
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| KR101784275B1 (en) * | 2016-02-11 | 2017-10-11 | 한국기술교육대학교 산학협력단 | Method for welding alloy steel and carbon steel |
| EP3466589A1 (en) * | 2017-10-09 | 2019-04-10 | HILTI Aktiengesellschaft | Fixing method |
| JP6797096B2 (en) * | 2017-10-23 | 2020-12-09 | りんかい日産建設株式会社 | Tapered steel pipe pile and its drawing method |
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| CN108817610A (en) * | 2018-09-07 | 2018-11-16 | 中国能源建设集团安徽电力建设第工程有限公司 | A kind of 12Cr1MoVG path Thick Wall Tube Welding method |
| US11536001B2 (en) * | 2019-02-05 | 2022-12-27 | Ojjo, Inc. | Truss foundations with improved corrosion resistance and related systems, methods and machines |
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| JP7002607B2 (en) * | 2020-07-06 | 2022-01-20 | りんかい日産建設株式会社 | Tapered steel pipe pile and its extraction method |
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| WO2014106358A1 (en) | 2014-07-10 |
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