CN109909645A - A method for controlling residual stress and deformation of single-sided filling welded joints of thick plates - Google Patents
A method for controlling residual stress and deformation of single-sided filling welded joints of thick plates Download PDFInfo
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- CN109909645A CN109909645A CN201811616715.4A CN201811616715A CN109909645A CN 109909645 A CN109909645 A CN 109909645A CN 201811616715 A CN201811616715 A CN 201811616715A CN 109909645 A CN109909645 A CN 109909645A
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Abstract
The invention discloses a kind of slab single sides to fill welding point residual stress deformation control method, the following steps are included: 1) finished edge on two plates to be welded, wherein the bottom of groove is backing run, backing run with a thickness of t2, two plate to be welded with a thickness of t1；2) it polishes the area to be welded surface of two plates to be welded, then is immersed in acetone and is cleaned by ultrasonic, then dry up spare；3) two plates to be welded are accommodated by fixture；4) accumulation weldering is carried out along two plate thickness directions to be welded by wire-feed motor and soldering apparatus from bottom to top, realize the vertical-growth of weld seam through-thickness, until entire connector is filled and is finished, it completes slab single side and fills welding point residual stress Deformation control, this method can substantially reduce the deformation after welding, reduce the residual stress of component.
Description
Technical field
The invention belongs to welding technology fields, are related to a kind of slab single side filling welding point residual stress Deformation control side
Method.
Background technique
The welding of slab is petrochemical industry, must can not in the large scale equipment building course in the fields such as space flight and aviation and military project
Few critical process.The thickness of these facility components is generally all in 20mm or more, and structure size is big, can only be added by segmentation
Molding is connected after work.In recent years, application of the multiple tracks fusing landfilling area in thick plates receives significant attention.The fusing of slab multiple tracks
Landfilling area has high quality, high efficiency and high-precision advantage.Research at present about slab multiple tracks fusing landfilling area is most of
Concentrate on welding parameter optimization all to reduce stomata, crackle, the welding defects such as side incomplete fusion.But post welding distortion is big, connector
Residual stress height is the main problem of slab multiple tracks fusing landfilling area.Residual stress in welding point to the integrality of workpiece not
Benefit, the brittle break for increasing workpiece are inclined to and reduce workpiece strength and fatigue life, substantially reduce the military service performance of workpiece.Than
Such as, certain model engine mainly uses TIG welding procedure, welding using D406A super-high strength steel as its case material at present
In process, the residual deformation tendency of the super-high strength steel solid engines shell of the saddle-shaped seam containing large scale is larger, and
Deformation rule is complicated, postwelding is difficult to orthopedic, is easy to cause dimension overproof even scrap of the product.It precisely predicts and reduces welding remnants
Stress and deformation are particularly significant for the component for obtaining high quality, and the method in some researchs using FEM calculation has obtained pre-
The numerical model of connector angular deformation is surveyed, but there is presently no the methods for proposing control post welding distortion and residual stress.
Summary of the invention
It is an object of the invention to overcome the above-mentioned prior art, a kind of slab single side filling welding point is provided
Residual stress deformation control method, this method can substantially reduce the deformation after welding, reduce the residual stress of component.
In order to achieve the above objectives, slab single side of the present invention fills welding point residual stress deformation control method packet
Include following steps:
1) finished edge on two plates to be welded, wherein the bottom of groove be backing run, backing run with a thickness of
T2, two plate to be welded with a thickness of t1；
2) it polishes the area to be welded surface of two plates to be welded, then is immersed in acetone and is cleaned by ultrasonic, so
After dry up it is spare；
3) two plates to be welded are accommodated by fixture；
4) accumulation weldering is carried out along two plate thickness directions to be welded by wire-feed motor and welding robot from bottom to top, realizes weldering
It is residual to complete slab single side filling welding point until entire connector is filled and finished for the vertical-growth for stitching through-thickness
Residue stress Deformation control.
The thickness of plate to be welded is less than the length of weld seam.
Groove is U-shaped groove, Y type groove or double V-groove.
The material of plate to be welded is carbon steel, stainless steel, high-strength steel, aluminium alloy or titanium alloy.
Silk filling fusion welding method be wire filling laser welding, laser-arc hybrid welding process, electron beam landfilling area, plasma beam landfilling area,
Fill silk argon arc welding or stick electrode arc welding.
The invention has the following advantages:
Slab single side filling welding point residual stress deformation control method of the present invention passes through when specific operation
Wire-feed motor and soldering apparatus carry out accumulation weldering along two plate thickness directions to be welded from bottom to top, realize hanging down for weld seam through-thickness
Growing straight is long, convenient and simple for operation to reduce the residual stress and deformation of connector.
Detailed description of the invention
Fig. 1 a is conventional flush system welding sequence schematic diagram；
Fig. 1 b is welding sequence schematic diagram of the present invention；
Fig. 2 is the operational flowchart of embodiment one；
Fig. 3 is the scale diagrams of one light plate groove of embodiment；
Fig. 4 is the influence diagram of welding sequence butt joint residual deformation in embodiment one；
Fig. 5 is the influence diagram of welding sequence butt joint angular deformation amount in embodiment one；
Fig. 6 is the influence diagram of welding sequence butt joint residual stress in the embodiment of the present invention one；
Fig. 7 a is cross section grid dividing figure in the embodiment of the present invention two；
Fig. 7 b is the schematic diagram of welding sequence in embodiment two；
Fig. 7 c is the schematic diagram that position is repaired in embodiment two；
Fig. 8 a is influence of the welding sequence of conventional flush system welding in the embodiment of the present invention two to residual stress distribution；
The influence of welding sequence of the invention to residual stress distribution in Fig. 8 b embodiment of the present invention two.
Specific embodiment
The invention will be described in further detail with reference to the accompanying drawing:
Slab single side of the present invention filling welding point residual stress deformation control method the following steps are included:
1) finished edge on two plates to be welded, wherein the bottom of groove be backing run, backing run with a thickness of
T2, two plate to be welded with a thickness of t1；
2) it polishes the area to be welded surface of two plates to be welded, then is immersed in acetone and is cleaned by ultrasonic, so
After dry up it is spare；
3) two plates to be welded are accommodated by fixture；
4) accumulation weldering is carried out along two plate thickness directions to be welded by wire-feed motor and welding robot from bottom to top, realizes weldering
It is residual to complete slab single side filling welding point until entire connector is filled and finished for the vertical-growth for stitching through-thickness
Residue stress Deformation control.
The thickness of plate to be welded is less than the length of weld seam；Groove is U-shaped groove, Y type groove or double V-groove；To welding plate
The material of material is carbon steel, stainless steel, high-strength steel, aluminium alloy or titanium alloy；Fusion welding method can be wire filling laser welding, laser-arc
Combined Welding, electron beam landfilling area, plasma beam landfilling area, fill silk argon arc welding or stick electrode arc welding etc..
Embodiment one
By 20mm for thick, 90mm long D406A high strength steel plate multiple tracks wire filling laser welding.It routinely tiles involved in the present embodiment
Two kinds of welding sequences of formula (weld seam horizontal growth) and staged (present invention), as shown in Fig. 1 a and Fig. 1 b.The present embodiment passes through examination
The method combined is tested and calculates to illustrate to melt the residual of landfilling area connector to slab is reduced using weld seam vertical-growth welding sequence
The influence of residue stress and deformation, detailed process are as shown in Figure 2.
Multiple tracks wire filling laser welding is carried out on 20mm thickness D406A high strength steel plate using normal welding sequence first, measurement connects
Head residual stress and deformation, key step is such as are as follows: the groove of small size, slope are pre-machined out for the plate with a thickness of 20mm
Mouth-shaped is as shown in figure 3, there are the backing runs with a thickness of 2mm for bottom；It is polished with sand paper workpiece area to be welded surface,
Workpiece area to be welded, is then dipped in acetone and is cleaned by ultrasonic, so far workpiece waits for by the metal particle and dust for wiping surface
The removal of the impurity such as welding zone field surface oxidation film finishes, and workpiece is dried up spare；Workpiece is assembled into preparation welding in place；Start wire feed
Machine and laser welder, layer-by-layer filler pass from lower to upper, fills until entire connector and finishes in the horizontal direction.Final realization is more
Road flush system filler wire welding, then measure connector angular deformation.
Two dimensional plane strain thermo-elastic-plastic finite element mould is established in the cross section of the connector obtained according to test in ANSYS
Type calculates residual deformation when carrying out 20mm thickness D406A super-high strength steel laser filler wire welding using conventional formula welding sequence.
Compare the calculated result and test result of fusion zone size and residual deformation, the results showed that fusion zone size is coincide good
Good, the relative error of the deflection of thickness direction is about 6.43%.Illustrate that test result and calculated result are kissed in error range
It closes good, that is to say, that remnants of the finite element model to the connector welded using staged welding sequence can be used
Stress and deformation carry out simulation calculating.
With reference to Fig. 4, when being welded using the sequence of staged (weld seam vertical-growth), workpiece total deformation is normal compared to general
Rule flush system welding is obviously reduced, with reference to Fig. 5, the maximum angular of conventional flush system welding and staged (weld seam vertical-growth) welding
Deflection is respectively 1.55mm and 0.15mm, the maximum angular of connector when being welded using the sequence of staged (weld seam vertical-growth)
Deflection is the 9.7% of flush system welding, and welding can be significantly reduced using the sequence welding of staged (weld seam vertical-growth)
Deformation, with reference to Fig. 6.The equivalent stress maximum value of conventional connector is 1419.65MPa, the stress from the longitudinal section of test plate (panel) center
Distribution it is found that conventional flush system connector interlayer there are higher residual stress, maximum interlayer stress value is about 1419.65MPa, and
Using the connector maximum residual stress value of staged (weld seam vertical-growth) sequence be reduced to 1026.79MPa and
1144.52MPa has respectively reduced about 392.86MPa and 275.13MPa than conventional flush system.In summary, for 20mm thickness
Welding can be significantly reduced using staged (weld seam vertical-growth) welding sequence in D406A super-high strength steel laser filler wire welding head
Residual deformation and stress.
Embodiment two
By taking the reparation of OD1219 × 18.4mm specification X80 tube body butt girth welding seam as an example, repairing weldering regional depth is 12mm, wide
Degree is 15mm, length 200mm.(weld seam is vertical for routine flush system involved in the present embodiment (weld seam horizontal growth) and staged
Growth) two kinds of welding sequences repair X80 tube body root bead position, use ANSYS finite element software, the mode of INDIRECT COUPLING
Thermal-structural analysis is completed, common flush system welding sequence and stress field of the invention are respectively obtained, it can from Fig. 8 a and Fig. 8 b
It arrives, X80 pipe ring weld seam is repaired using the staged welding sequence based on weld seam vertical-growth, makes weld seam vertical-growth,
The maximum equivalent of postwelding weld seam is reduced by about 49MPa, and maximum axial stress is reduced by about 96MPa, and the area surface of the region of high stress
Product substantially reduces.
Claims (5)
1. a kind of slab single side fills welding point residual stress deformation control method, which comprises the following steps:
1) finished edge on two plates to be welded, wherein the bottom of groove is backing run, backing run with a thickness of t2,
Two plate to be welded with a thickness of t1；
2) it polishes the area to be welded surface of two plates to be welded, then is immersed in acetone and is cleaned by ultrasonic, then blow
It does spare；
3) two plates to be welded are accommodated by fixture；
4) accumulation weldering is carried out along two plate thickness directions to be welded by wire-feed motor and welding robot from bottom to top, realizes weld seam edge
The vertical-growth of thickness direction is completed slab single side filling welding point remnants and is answered until entire connector is filled and finished
Power Deformation control.
2. slab single side according to claim 1 fills welding point residual stress deformation control method, which is characterized in that
The thickness of plate to be welded is less than the length of weld seam.
3. slab single side according to claim 1 fills welding point residual stress deformation control method, which is characterized in that
Groove is U-shaped groove, Y type groove or double V-groove.
4. slab single side according to claim 1 fills welding point residual stress deformation control method, which is characterized in that
The material of plate to be welded is carbon steel, stainless steel, high-strength steel, aluminium alloy or titanium alloy.
5. slab single side according to claim 1 fills welding point residual stress deformation control method, which is characterized in that
Silk filling fusion welding method is wire filling laser welding, laser-arc hybrid welding process, electron beam landfilling area, plasma beam landfilling area, fill silk argon arc
Weldering or stick electrode arc welding.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811616715.4A CN109909645B (en) | 2018-12-27 | 2018-12-27 | A method for controlling residual stress and deformation of single-sided filling welded joints of thick plates |
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|---|---|---|---|
| CN201811616715.4A CN109909645B (en) | 2018-12-27 | 2018-12-27 | A method for controlling residual stress and deformation of single-sided filling welded joints of thick plates |
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| CN109909645B CN109909645B (en) | 2020-08-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111069745A (en) * | 2019-12-28 | 2020-04-28 | 天津航天长征火箭制造有限公司 | Welding method suitable for thick plate aluminum alloy |
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| US4187410A (en) * | 1977-03-10 | 1980-02-05 | Vsesojuzny Nauchno-Issledovatelsky, Proektno-Konstruktorsky i Tekhnologichesky Institut Elektrosvarochnogo Oborudova | Method of multi-pass narrow groove arc welding |
| JPH01218781A (en) * | 1988-02-26 | 1989-08-31 | Toyo Seikan Kaisha Ltd | Butt welding method by laser beam |
| CN103008895A (en) * | 2012-12-15 | 2013-04-03 | 华中科技大学 | Narrow gap multi-pass laser welding method for thick plate |
| CN106112263A (en) * | 2016-07-29 | 2016-11-16 | 西安交通大学 | Using T2 red copper as the titanium steel composite board laser of transition zone silk filling butt welding method |
| CN106735897A (en) * | 2016-12-28 | 2017-05-31 | 西南交通大学 | The device and method of simulation slab narrow gap laser filling wire welding and real-time monitoring |
-
2018
- 2018-12-27 CN CN201811616715.4A patent/CN109909645B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4187410A (en) * | 1977-03-10 | 1980-02-05 | Vsesojuzny Nauchno-Issledovatelsky, Proektno-Konstruktorsky i Tekhnologichesky Institut Elektrosvarochnogo Oborudova | Method of multi-pass narrow groove arc welding |
| JPH01218781A (en) * | 1988-02-26 | 1989-08-31 | Toyo Seikan Kaisha Ltd | Butt welding method by laser beam |
| CN103008895A (en) * | 2012-12-15 | 2013-04-03 | 华中科技大学 | Narrow gap multi-pass laser welding method for thick plate |
| CN106112263A (en) * | 2016-07-29 | 2016-11-16 | 西安交通大学 | Using T2 red copper as the titanium steel composite board laser of transition zone silk filling butt welding method |
| CN106735897A (en) * | 2016-12-28 | 2017-05-31 | 西南交通大学 | The device and method of simulation slab narrow gap laser filling wire welding and real-time monitoring |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111069745A (en) * | 2019-12-28 | 2020-04-28 | 天津航天长征火箭制造有限公司 | Welding method suitable for thick plate aluminum alloy |
| CN111069745B (en) * | 2019-12-28 | 2022-03-25 | 天津航天长征火箭制造有限公司 | Welding method suitable for thick plate aluminum alloy |
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