CN101722351A - Method for controlling quality of linerless single-sided welding double-sided molding backing weld seam - Google Patents
Method for controlling quality of linerless single-sided welding double-sided molding backing weld seam Download PDFInfo
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- CN101722351A CN101722351A CN200810201872A CN200810201872A CN101722351A CN 101722351 A CN101722351 A CN 101722351A CN 200810201872 A CN200810201872 A CN 200810201872A CN 200810201872 A CN200810201872 A CN 200810201872A CN 101722351 A CN101722351 A CN 101722351A
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- 238000003466 welding Methods 0.000 title claims abstract description 121
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000000465 moulding Methods 0.000 title claims abstract description 16
- 150000001875 compounds Chemical class 0.000 claims abstract description 4
- 238000003908 quality control method Methods 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 description 16
- 229910000831 Steel Inorganic materials 0.000 description 14
- 239000010959 steel Substances 0.000 description 14
- 238000007789 sealing Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 230000008520 organization Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 229910000851 Alloy steel Inorganic materials 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The invention discloses a method for controlling quality of a linerless single-sided welding double-sided molding backing weld seam. The method comprises the steps that: a welding groove design adopts a compound V-shaped groove, namely a lower V-shaped groove is formed by deviating the groove root face outwards from the groove root face, and an upper V-shaped groove is formed by deviating the groove root face outsides from the lower V-shaped groove; one side of the lower V-shaped groove forms an angle beta of between 30 and 40 DEG with the axis of the groove; one side of the upper V-shaped groove forms the angle alpha of between 13 and 15 DEG with the axis of the groove; the height (m) of the lower V-shaped groove is determined according to the thickness of a plate; a welding voltage is between 20 and 24 V; a welding speed is between 0.2 and 0.3 m/min; and a welding current is between 115 and 165 A. The method not only reduces cost addition caused by the addition of a molding liner, but also reduces the requirement of welding on a groove size and an assembly clearance, thereby solving the problem of single-sided welding double-sided molding backing weld under conditions of different groove sizes and assembly clearances.
Description
Technical field
The present invention relates to solder technology; be particularly related to the linerless single-sided welding double-sided molding backing weld seam method of quality control; it is that a kind of back side need not to add any assistant formation liner and the welding technique that can realize single face welding and double face shaping consumable electrode gas-arc backing welding under different bevel for welding sizes, assembly clearance condition, can be widely used in the consumable electrode gas-arc bottoming welding of steel plate or steel pipe.
Background technology
Current, when steel plate and steel pipe welding, single face welding and double face shaping bottoming welding process application is extensive, relates to fields such as boiler and pressure vessel manufacturing, pipeline installation welding, shipbuilding, machine-building, construction steel structure.Compare with two-sided welding, single face welding and double face shaping bottoming welding procedure has been saved the operation of weldment upset and back side cleaning root of weld, and labor strength is low, the welding efficiency height, and especially in the occasion that can't carry out welding by both sides, its advantage is more obvious.
Yet the single face welding and double face shaping bottoming welding procedure of current widespread usage has two big characteristics:
The first, in order to guarantee the back of weld Forming Quality, paste various special-purpose liners at the bevel for welding back side, as copper lining, ceramic substrate, welding flux backing etc., for example Chinese patent application CN200610122611.9 discloses a kind of CO that utilizes back side ceramic substrate
2Gas protected single-sided welding and double-sided forming process then discloses single face welding and double face shaping submerged arc welding technology and the device that solder flux is added at a kind of back side as Chinese patent application CN200710022737.3.This two class all belongs to the forced shaping welding of the single welding back side, and the selection of cushion device and interpolation have increased the complexity of production cost and device, and workman's workload also significantly increases simultaneously;
The second, in single face welding and double face free forming bottoming welding commonly used, usually bevel for welding size (bevel angle, root face), assembly clearance there is very strict requirement, under the situation of above-mentioned fixed size, utilize the stable weld procedure specification of a cover to weld, guarantee the back of weld Forming Quality.For example: the open pressure pipeline girth welding backing welding of using, when adopting the gas metal-arc welding single face welding and double face shaping, about 30 ° of bevel angle, the about 1.6mm of root face size, assembly clearance 1.5～2.0mm.For guarantee groove size and assembly clearance accurately, the job site need be equipped with special-purpose groove processing machine and pipeline to mouthpart, and is very high to the configuration requirement that welds public auxilliary facility, increased welding cost virtually, makes welding operation complicated simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of linerless single-sided welding double-sided molding backing weld seam method of quality control; need not to add any assistant formation liner at the back side of steel plate and steel pipe and can be in different bevel for welding sizes; realize the welding technique of single face welding and double face shaping consumable electrode gas-arc backing welding under the assembly clearance condition; both having reduced the cost that brings because add the moulding liner increases; reduced the requirement of welding again, thereby solved the problem of single face welding and double face shaping bottoming welding under different groove sizes and the assembly clearance condition groove size and assembly clearance.
For achieving the above object, technical scheme of the present invention is:
A kind of linerless single-sided welding double-sided molding backing weld seam method of quality control adopts compound double V-groove with bevel for welding design, promptly root face, form down double V-groove, descend the outside deviation of double V-groove to form double V-groove certainly from the outside deviation of root face; Following double V-groove one side becomes 30 °～40 ° angle β with the groove central axis; Last double V-groove one side becomes 13 °～15 ° angle α with the groove central axis; Following double V-groove height (m) value size is decided with thickness of slab; Weldingvoltage is 20～24V, speed of welding 0.2～0.3m/min, welding current 115～165A; Root face size (R) 1.0～2.4mm; Welding assembly gap (G) is 0～3.6mm, and wherein, bevel for welding root face size (R) increases, and welding current then increases accordingly, and if the welding assembly gap increases, welding current then needs corresponding reduction.
Further, welding is selected pure CO for use with protective gas
2, flow is 15～20L/min.
The present invention utilizes steel plate or steel pipe to carry out single face welding and double face shaping bottoming welding, adopt different bevel for welding root face size and assembly clearance, guarantee the Forming Quality of back side backing weld seam by suitable adjustment weld procedure specification, therefrom can obtain to guarantee the optimum organization of root face size, assembly clearance and the weld procedure specification of best sealing run Forming Quality.
Utilize the dc inversion source of welding current to carry out consumable electrode gas-arc bottoming welding, the welding wire automatic feed, welding gun hand-manipulated is finished welding process.In view of the characteristics that semi-automatic gas shielded arc welding connects, the adjustment of weld procedure specification only limits to welding current, and weldingvoltage and speed of welding control are within the specific limits.
Compound double V-groove is adopted in the design of bevel for welding form, wherein, when the bigger following V-type angle Selection of backing weld seam back side Forming Quality influence is 30 °～40 °, helps the adjustment of weld procedure specification.If this angle is excessive, then burn at back of weld easily; If too little, back side incomplete penetration defect then appears easily.M value size is decided with thickness of slab.
Welding is selected pure CO for use with protective gas
2, flow is 15～20L/min, selects the low-alloy high-strength steel gas shield solid core welding wire of Φ 1.2mm for use.The about 20mm of dry extension of electrode degree.Before the welding bevel for welding and both sides 30mm thereof are cleaned out, comprised corrosion, greasy dirt, moisture etc., guarantee that nothing welding defective and welding joint mechanical property are good.Utilize the strict control of standard-sized patch assembly clearance when steel plate and steel pipe assembling.
Do not having to find under different groove sizes, assembly clearance condition, to carry out the technology that linerless single-sided welding double-sided molding backing weld connects in the disclosed technology.
Beneficial effect of the present invention
The invention provides that a kind of back side that is applicable to steel plate and steel pipe need not to add any assistant formation liner and can be in different bevel for welding sizes; realize the welding technique of single face welding and double face shaping consumable electrode gas-arc backing welding under the assembly clearance condition; and provided the bevel for welding root face size that can guarantee best sealing run Forming Quality; the optimum organization of assembly clearance and weld procedure specification; the production cost that brings because add the moulding liner and the increase of workload had both been reduced in actual applications; reduced the requirement of welding process again to groove size and assembly clearance; and solved the problem of the bottoming of single face welding and double face shaping under different groove sizes and assembly clearance condition welding; the adaptability of environmental condition is strong, and it is convenient to use.
Description of drawings
Fig. 1 is a bevel for welding form design diagram of the present invention;
Fig. 2 can guarantee the optimum organization and the variation rule curve thereof of root face size, assembly clearance and the weld procedure specification of best sealing run Forming Quality for the present invention.
The specific embodiment
The specific embodiment of the present invention is as follows:
Select three kinds of dissimilar common low-alloy steel respectively for use, according to bevel shown in Figure 1, bevel for welding root face size R is processed as 1.6mm, and assembly clearance G is 2.4mm, and adopts weld procedure specification corresponding with it in the table 1, and welding is selected pure CO for use with protective gas
2, flow is 15～20L/min.The about 20mm of dry extension of electrode degree.Can select desirable weld procedure specification easily according to bevel for welding root face size and assembling situation by Fig. 2, guarantee the back side Forming Quality of single face welding and double face shaping backing weld seam.
Table 1 is depicted as the optimum organization that part can guarantee root face size, assembly clearance and the weld procedure specification of best sealing run Forming Quality.When weldingvoltage, speed of welding and bevel for welding angle within the specific limits fixedly the time, the mainly variation of mating bevel for welding root face size and assembly clearance by the adjustment of welding current, and can access the good single face welding and double face shaping backing weld seam of back side moulding.Bevel for welding root face size increases, and welding current needs corresponding increasing, and if the welding assembly gap increases, welding current then needs corresponding reduction.
Figure 2 shows that the optimum organization and the variation rule curve thereof of root face size, assembly clearance and the weld procedure specification that can guarantee best sealing run Forming Quality.Groove size and welding procedure combination that utilization is positioned on the curve can obtain the good weld seam of back side Forming Quality, and the technology beyond the curve then is difficult to guarantee.Single face welding and double face shaping sealing run Forming Quality is mainly weighed by following quantitative and qualitative index.Weld reinforcement, weld width, face of weld uniformity coefficient, weld seam and mother metal edge transition situation etc.Wherein, the above two are quantitative target, and weld reinforcement requires to surpass 2mm, and weld width requires to surpass groove original width 4mm, and promptly the every side mother metal of groove fusing amount can not be more than 2mm; Both are macroscopical qualitative index for the back, and it is even, attractive in appearance to require face of weld to sprawl, and defectives such as obvious necking down and undercut can not be arranged, and weld seam and the transition of mother metal edge-smoothing can not have tangible transition shoulder and sharp corners etc.Groove state on the curve shown in Figure 2 and process combination can satisfy the requirement of above-mentioned sealing run Forming Quality.
Table 2 is depicted as three kinds of dissimilar common low-alloy steel linerless single-sided welding double-sided molding gas shield bottoming welding examples.Implementation result is as shown in table 3.
Table 1 part root face size, assembly clearance and welding procedure combination
Three kinds of common low-alloy steel linerless single-sided welding double-sided molding gas shield bottoming welding examples of table 2
Three kinds of common low-alloy steel single face welding and double face shaping gas shield bottoming welding implementation results of table 3
Claims (2)
1. linerless single-sided welding double-sided molding backing weld seam method of quality control adopts compound double V-groove with the bevel for welding design, promptly root face, form down double V-groove, descend the outside deviation of double V-groove to form double V-groove certainly from the outside deviation of root face; Following double V-groove one side becomes 30 °～40 ° angle β with the groove central axis; Last double V-groove one side becomes 13 °～15 ° angle α with the groove central axis; Following double V-groove height (m) value size is decided with thickness of slab; Weldingvoltage is 20～24V, speed of welding 0.2～0.3m/min, welding current 115～165A; Root face size (R) 1.0～2.4mm; Welding assembly gap (G) is 0～3.6mm, and wherein, bevel for welding root face size (R) increases, and welding current then increases accordingly, and if the welding assembly gap increases, welding current then needs corresponding reduction.
2. linerless single-sided welding double-sided molding backing weld seam method of quality control as claimed in claim 1 is characterized in that, welding is selected pure CO for use with protective gas
2, flow is 15～20L/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810201872A CN101722351A (en) | 2008-10-28 | 2008-10-28 | Method for controlling quality of linerless single-sided welding double-sided molding backing weld seam |
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| CN200810201872A CN101722351A (en) | 2008-10-28 | 2008-10-28 | Method for controlling quality of linerless single-sided welding double-sided molding backing weld seam |
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| CN101722351A true CN101722351A (en) | 2010-06-09 |
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| CN102430893A (en) * | 2011-09-15 | 2012-05-02 | 东方电气集团东方电机有限公司 | Method for manufacturing small-inner-diameter hollow main shaft |
| CN103240515A (en) * | 2013-05-24 | 2013-08-14 | 西安石油大学 | Quality control method for high-frequency resistance welded pipe welding area |
| CN105014187A (en) * | 2015-07-07 | 2015-11-04 | 中国化学工程第四建设有限公司 | Single-side welding and double-side forming method for ceramic gasket of rubber lined tank |
| CN105031831A (en) * | 2015-07-14 | 2015-11-11 | 常州宝菱重工机械有限公司 | Medical proton instrument therapy cabin rotating ring |
| CN105171202A (en) * | 2015-10-15 | 2015-12-23 | 上海中远川崎重工钢结构有限公司 | Method for welding of one-sided welding and double-sided forming welding seam through solid-core carbon dioxide gas shielded arc welding |
| CN105445434A (en) * | 2015-12-22 | 2016-03-30 | 宝山钢铁股份有限公司 | Pipeline steel pipe on-site girth welding evaluation method |
| CN105643066A (en) * | 2016-03-31 | 2016-06-08 | 广船国际有限公司 | Thick-plate single-side welding method |
| CN107975642A (en) * | 2017-12-28 | 2018-05-01 | 哈尔滨锅炉厂有限责任公司 | Boiler and the adapter of pressure container cylinder emplacement type heavy caliber thick wall and connection method |
| CN108890092A (en) * | 2018-07-18 | 2018-11-27 | 攀钢集团工程技术有限公司 | The method of consumable electrode MAG weldering welding tube sheet single face welding and double face shaping |
| CN109530879A (en) * | 2018-12-25 | 2019-03-29 | 渤海造船厂集团有限公司 | Robot single-side welding double-side forming full penetration vertical position welding weld groove |
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2008
- 2008-10-28 CN CN200810201872A patent/CN101722351A/en active Pending
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| CN102430893A (en) * | 2011-09-15 | 2012-05-02 | 东方电气集团东方电机有限公司 | Method for manufacturing small-inner-diameter hollow main shaft |
| CN103240515A (en) * | 2013-05-24 | 2013-08-14 | 西安石油大学 | Quality control method for high-frequency resistance welded pipe welding area |
| CN105014187A (en) * | 2015-07-07 | 2015-11-04 | 中国化学工程第四建设有限公司 | Single-side welding and double-side forming method for ceramic gasket of rubber lined tank |
| CN105031831A (en) * | 2015-07-14 | 2015-11-11 | 常州宝菱重工机械有限公司 | Medical proton instrument therapy cabin rotating ring |
| CN105031831B (en) * | 2015-07-14 | 2017-12-05 | 常州宝菱重工机械有限公司 | The rotating ring of medical proton instrument treatment tank |
| CN105171202A (en) * | 2015-10-15 | 2015-12-23 | 上海中远川崎重工钢结构有限公司 | Method for welding of one-sided welding and double-sided forming welding seam through solid-core carbon dioxide gas shielded arc welding |
| CN105445434A (en) * | 2015-12-22 | 2016-03-30 | 宝山钢铁股份有限公司 | Pipeline steel pipe on-site girth welding evaluation method |
| CN105643066A (en) * | 2016-03-31 | 2016-06-08 | 广船国际有限公司 | Thick-plate single-side welding method |
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| CN115106673A (en) * | 2021-03-22 | 2022-09-27 | 宝山钢铁股份有限公司 | Method for evaluating weldability of high-strength pipeline steel by single-side welding and double-side forming |
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Application publication date: 20100609 |