CN115647535A - Double-side double-arc welding method for complex curved surface component of special vehicle - Google Patents
Double-side double-arc welding method for complex curved surface component of special vehicle Download PDFInfo
- Publication number
- CN115647535A CN115647535A CN202211425437.0A CN202211425437A CN115647535A CN 115647535 A CN115647535 A CN 115647535A CN 202211425437 A CN202211425437 A CN 202211425437A CN 115647535 A CN115647535 A CN 115647535A
- Authority
- CN
- China
- Prior art keywords
- welding
- double
- bottom plate
- arc
- sided
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention provides a double-side double-arc welding method for a complex curved surface component of a special vehicle, which comprises the steps of processing a welding groove of a single bottom plate; assembling a plurality of single bottom plates; pressing the assembled U-shaped bottom plate by using a tool, and performing positioning spot welding; and performing double-sided double-arc welding on the spot-welded U-shaped bottom plate. The invention can ensure the penetration of the root part of the welding seam of the bottom plate, has high welding strength, reduces welding defects, ensures uniform molding of the surface of the welding seam and improves the integral surface quality of a product; the welding deformation of the product can be greatly reduced by simultaneously welding the front side and the back side, the integral welding deformation (transverse, longitudinal and torsional deformation) is less than or equal to 4mm, the stress state of a joint is improved, the generation of welding cracks is effectively avoided, and the procedure of correcting after welding is reduced; the time for completing double-sided double arc welding of a single welding line is less than or equal to 10min, the whole U-shaped bottom plate (4 welding lines) can be welded within 40min, and compared with the original process, the double-sided double arc welding process can reduce the workload of workers and greatly reduce the labor intensity.
Description
Technical Field
The invention belongs to the technical field of welding and manufacturing, and particularly relates to a double-face double-arc welding method for a U-shaped bottom plate of a large complex curved surface component of a special vehicle.
Background
The U-shaped bottom plate is an important part of the body of the special vehicle, is the basis for welding and manufacturing the body of the special vehicle, determines the rigidity of the whole body, directly influences the safety and reliability of the vehicle by various indexes and performance of the U-shaped bottom plate, and plays a significant role in playing the overall performance of the vehicle.
The production of U type bottom plate adopts the manual tailor-welding process of polylith singlepiece bottom plate butt joint at present, and the singlepiece bottom plate shape is fillet die mould structure, because has certain dimensional error behind the die mould, causes to assemble before the welding and is difficult to guarantee to align completely, and welding seam length all is more than two meters in addition, and has many butt joint long welding seams, and the postweld deflection is great and uncontrollable, is difficult to regard as the location basis of later stage automobile body combination. If the welding seam of the bottom plate has a problem or the deformation of the bottom plate is overlarge due to welding, the quality problems such as the out-of-tolerance of the precision of a subsequent set of finished vehicles and the size of the finished vehicles can be directly caused. Therefore, how to improve the welding quality stability and reduce the deformation of the U-shaped bottom plate of the large-sized complex curved surface component by using an advanced welding means is a major direction of special vehicle welding research.
Disclosure of Invention
Technical problem to be solved
The invention provides a double-side double-arc welding method for a complex curved surface component of a special vehicle, which aims to solve the technical problems of unstable welding quality and large welding deformation of a U-shaped bottom plate, thereby improving the comprehensive mechanical property of a welding seam of the U-shaped bottom plate and improving the overall mechanical property of the vehicle.
(II) technical scheme
In order to solve the technical problem, the invention provides a double-sided double-arc welding method for a complex curved surface component of a special vehicle, wherein the complex curved surface component is a U-shaped bottom plate, and the double-sided double-arc welding method comprises the following steps:
s1, processing a welding groove of a single bottom plate;
s2, assembling a plurality of single bottom plates;
s3, pressing the assembled U-shaped bottom plate by using a tool, and performing positioning spot welding;
s4, performing double-sided double arc welding on the spot-welded U-shaped bottom plate: adopting consumable electrode active gas to protect electric arc welding, adopting a combination of flat welding and overhead welding at a welding position, and carrying out double-side welding with double power supplies, wherein two electric arcs are mutually independent in the welding process; the front welding current is 160-220A, the back welding current is 120-180A, the welding voltage is 18-28V, the front arc and the back arc are staggered by about 50mm during welding, the advancing directions of the two arcs are consistent during welding, and a certain distance is always kept.
Furthermore, the single bottom plate is made of high-strength steel, the width of the single bottom plate is 1900-2400 mm, the thickness of the single bottom plate is 6mm, and the tensile strength of the single bottom plate is 800-1400 MPa.
Further, in the step S1, the groove is processed into a double-sided groove, the angle of the groove is 45 degrees, and the truncated edge of the groove is 2mm.
Further, in the step S2, the gap and the staggered edge of the single bottom plate are ensured to meet the welding requirement during assembly, wherein the gap of the plane position of the bottom plate is less than or equal to 1mm, and the staggered edge is less than or equal to 2mm; the gap between the vertical edges of the bottom plate is less than or equal to 2mm, the misalignment is less than or equal to 2mm, and the total gap and the misalignment are less than or equal to 3mm.
Further, in step S3, the tack welding positions are selected from the top of the vertical edge of the bottom plate, the arc edge of the bottom plate, and the plane position of the bottom plate.
Further, in step S3, the interval between the adjacent spot welding positions is 300 to 500mm.
Further, in step S4, the welding wire used for welding has a diameter of 1.2mm, the protective gas has a volume percentage of 90% Ar gas +10% CO 2 The flow rate of the protective gas of the mixed gas is 15-25L/min.
(III) advantageous effects
The invention provides a double-side double-arc welding method for a complex curved surface component of a special vehicle, which comprises the steps of processing a welding groove of a single bottom plate; assembling a plurality of single bottom plates; pressing the assembled U-shaped bottom plate by using a tool, and performing positioning spot welding; and performing double-sided double-arc welding on the spot-welded U-shaped bottom plate. The invention can ensure the penetration of the root part of the welding seam of the bottom plate, has high welding strength, reduces the welding defects, ensures the uniform forming of the surface of the welding seam and improves the integral surface quality of the product; the welding deformation of the product can be greatly reduced by simultaneously welding the front side and the back side, the integral welding deformation (transverse, longitudinal and torsional deformation) is less than or equal to 4mm, the stress state of a joint is improved, the generation of welding cracks is effectively avoided, and the procedure of correcting after welding is reduced; the time for completing double-sided double arc welding of a single welding line is less than or equal to 10min, the whole U-shaped bottom plate (4 welding lines) can be welded within 40min, and compared with the original process, the double-sided double arc welding process can reduce the workload of workers and greatly reduce the labor intensity.
Drawings
FIG. 1 is a schematic view of a welding groove of a single bottom plate in an embodiment of the invention;
fig. 2a is a top view, fig. 2b is a front view, and fig. 2c is a side view of a welded U-shaped bottom plate according to an embodiment of the present invention.
Detailed Description
In order to make the objects, contents and advantages of the present invention more apparent, the following detailed description of the present invention will be made in conjunction with the accompanying drawings and examples.
The embodiment provides a double-sided double-arc welding method for a complex curved surface component of a special vehicle, which specifically comprises the following steps:
s1, processing a welding groove of a single base plate, wherein the groove is processed into a double-sided groove, the angle of the groove is 45 degrees, and the truncated edge of the groove is 2mm; before welding, oil stain, rust and sundries on two sides of the groove are cleaned, as shown in figure 1. The single bottom plate is made of high-strength steel, the width of the single bottom plate is 1900-2400 mm, the thickness of the single bottom plate is 6mm, and the tensile strength of the single bottom plate is 800-1400 MPa.
S2, assembling the single bottom plates, wherein the gaps and the staggered edges of the single bottom plates meet the welding requirements during assembling, the gaps are not more than 1mm in the plane position of the bottom plates, and the staggered edges are not more than 2mm; the gap between the vertical edges of the bottom plate is less than or equal to 2mm, the misalignment is less than or equal to 2mm, and the total gap and the misalignment are less than or equal to 3mm.
S3, pressing the assembled U-shaped bottom plate by using a tool, and performing positioning spot welding, wherein the positioning spot welding positions are selected from the top end of the vertical edge 1 of the bottom plate, the arc edge 2 of the bottom plate and the plane position 3, and the interval between the adjacent spot welding positions is 300-500 mm.
S4, performing double-sided double arc welding on the spot-welded U-shaped bottom plate:
adopting consumable electrode active gas protection arc welding, and adopting a combination of flat welding and overhead welding at the welding position. The 6-axis welding robot and the digital welding machine are used for dual-power double-side welding, two electric arcs are mutually independent in the welding process, and welding process parameters can be independently adjusted. The front welding current is 160-220A, the back welding current is 120-180A, the welding voltage is 18-28V, the front arc and the back arc are staggered by about 50mm during welding, the advancing directions of the two arcs are consistent during welding, and a certain distance is always kept. Welding wire diameter 1.2mm, protective gas 90% by volume Ar gas +10% by volume CO 2 The flow rate of the mixed gas is 15-25L/min until the front and back welding seams are fully welded.
And S5, cooling to normal temperature after welding is finished, checking whether the appearance of the welding line is qualified or not, and submitting the sample piece to inspection after the appearance is qualified. Cutting the welding seam of the base plate sample, detecting the defects of the welding seam by adopting an X-ray detection mode, and judging whether the welding seam has welding defects such as cracks, slag inclusion, incomplete fusion and the like. After detection, the quality of the welding seam reaches the level I, and the welding seam has good performance.
The special vehicle U-shaped bottom plate is formed by splicing and welding 5 single bottom plates, the structure of the special vehicle U-shaped bottom plate is shown in figures 2a-2c, the length range of the U-shaped bottom plate is 4300-6500 mm, and the special vehicle U-shaped bottom plate is provided with a first bottom plate welding line 4, a second bottom plate welding line 5, a third bottom plate welding line 6 and a fourth bottom plate welding line 7.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
1. The double-sided double-arc welding method for the complex curved surface component of the special vehicle is characterized in that the complex curved surface component is a U-shaped bottom plate, and the double-sided double-arc welding method comprises the following steps:
s1, processing a welding groove of a single bottom plate;
s2, assembling a plurality of single bottom plates;
s3, pressing the assembled U-shaped bottom plate by using a tool, and performing positioning spot welding;
s4, performing double-sided double arc welding on the spot-welded U-shaped bottom plate: adopting consumable electrode active gas shielded arc welding, adopting a combination of flat welding and overhead welding at a welding position, and carrying out double-sided welding with double power supplies, wherein the two electric arcs are mutually independent in the welding process; the front welding current is 160-220A, the back welding current is 120-180A, the welding voltage is 18-28V, the front arc and the back arc are staggered by about 50mm during welding, the advancing directions of the two arcs are consistent during welding, and a certain distance is always kept.
2. The double-sided double arc welding method according to claim 1, wherein the single base plate is made of high-strength steel, has a width of 1900 to 2400mm, a thickness of 6mm, and a tensile strength of 800 to 1400MPa.
3. The double-sided double arc welding method according to claim 1, wherein the bevel is machined to a double-sided bevel in step S1, the bevel angle is 45 °, and the bevel blunt edge is 2mm.
4. The double-sided double arc welding method according to claim 1, wherein in step S2, the gap and the misalignment of the single bottom plate are ensured to meet the welding requirements during assembly, wherein the gap at the plane position of the bottom plate is less than or equal to 1mm, and the misalignment is less than or equal to 2mm; the gap between the vertical edges of the bottom plate is less than or equal to 2mm, the misalignment is less than or equal to 2mm, and the total gap plus misalignment is less than or equal to 3mm.
5. The double-sided double arc welding method according to claim 1, wherein in the step S3, tack welding positions are selected from the top of the vertical side of the base plate, the arc side of the base plate, and a flat position.
6. The double-sided double arc welding method according to claim 1, wherein in the step S3, adjacent spot welding positions are spaced 300 to 500mm apart.
7. The double-sided double arc welding method according to claim 1, wherein the welding wire used in the welding is 1.2mm in diameter, the protective gas is 90% by volume Ar gas +10% by volume CO in step S4 2 The flow rate of the protective gas of the mixed gas is 15-25L/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211425437.0A CN115647535A (en) | 2022-11-14 | 2022-11-14 | Double-side double-arc welding method for complex curved surface component of special vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211425437.0A CN115647535A (en) | 2022-11-14 | 2022-11-14 | Double-side double-arc welding method for complex curved surface component of special vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115647535A true CN115647535A (en) | 2023-01-31 |
Family
ID=85021673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211425437.0A Pending CN115647535A (en) | 2022-11-14 | 2022-11-14 | Double-side double-arc welding method for complex curved surface component of special vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115647535A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116451045A (en) * | 2023-06-14 | 2023-07-18 | 苏芯物联技术(南京)有限公司 | Welding process steady-state current calculation method |
-
2022
- 2022-11-14 CN CN202211425437.0A patent/CN115647535A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116451045A (en) * | 2023-06-14 | 2023-07-18 | 苏芯物联技术(南京)有限公司 | Welding process steady-state current calculation method |
| CN116451045B (en) * | 2023-06-14 | 2023-08-22 | 苏芯物联技术(南京)有限公司 | Welding process steady-state current calculation method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104874929B (en) | Welding technique of industrial pure-Ti sheets with thickness of 11-30 mm | |
| CN105665933A (en) | Laser-arc hybrid welding method for Invar die steel | |
| CN111069745B (en) | Welding method suitable for thick plate aluminum alloy | |
| CN103252557B (en) | Welding method achieving medium thick plate backing welding without back gouging | |
| CN104959725A (en) | Electron beam welding deformation control method of large variable-thickness component | |
| CN112296494B (en) | Welding flux copper gasket method submerged-arc welding method for jointed boards with different thicknesses | |
| CN102294545B (en) | Laser penetration welding seam formation control method for Hass alloy conductive roller | |
| CN103480966A (en) | Austenite stainless steel lap-over laser welding method | |
| CN104493342A (en) | Medium thickness plate X-shaped bevel welding technology without back chipping | |
| EP2695694A1 (en) | Method of welding of elements for the power industry, particulary of sealed wall panels of power boilers using MIG/MAG and laser welding | |
| CN108941913A (en) | A kind of efficient laser-MAG compound welding method of slab marine high strength steel | |
| CN115647535A (en) | Double-side double-arc welding method for complex curved surface component of special vehicle | |
| KR20140133935A (en) | Laser-arc hybrid welding method | |
| CN106378518A (en) | TIG welding method used for large-diameter thin-wall stainless steel cylinder workpiece circular seam | |
| CN104759739A (en) | Compound welding process of railway vehicle box beam | |
| CN105364430B (en) | The method for laser welding that a kind of thin plate edge joint synchronously rolls | |
| CN111702302A (en) | Welding process of lightweight aluminum alloy vehicle door | |
| KR20100074890A (en) | Hybrid welding method | |
| CN114248000B (en) | Welding method and system | |
| CN111360408B (en) | Laser GMAW composite welding method for H04MnNi2Ti steel sandwich structure | |
| CN110919183A (en) | Laser-arc composite efficient welding method for thick plate high-strength steel and welding clamp thereof | |
| CN216758558U (en) | High-impact-value electroslag welding T-shaped joint | |
| CN116551131B (en) | Back chipping-free welding method | |
| CN110614438A (en) | Laser-arc hybrid welding method for high-strength steel in butt joint gap | |
| CN212714518U (en) | Bridge deck stiffening structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |