CN113681115B - Process for assembling and welding brake pad supporting and hanging seat and framework of bogie of motor train unit with circumferential weld seam - Google Patents
Process for assembling and welding brake pad supporting and hanging seat and framework of bogie of motor train unit with circumferential weld seam Download PDFInfo
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- CN113681115B CN113681115B CN202111141295.0A CN202111141295A CN113681115B CN 113681115 B CN113681115 B CN 113681115B CN 202111141295 A CN202111141295 A CN 202111141295A CN 113681115 B CN113681115 B CN 113681115B
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- 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
- B23K9/0026—Arc welding or cutting specially adapted for particular articles or work
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- 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
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Abstract
The process for assembling and welding the brake pad supporting and hanging seat and the framework of the periphery welding seam type motor train unit bogie relates to the technical field of welding of railway vehicle bogies, and the assembling and welding process is characterized in that grooves similar to welding seam grooves are formed in non-welding seam area base metal connected with welding seams or the end portions of vertical bars of the brake pad supporting and hanging seat, welded starting and closing arc points are arranged in the grooves during welding, welded metal in the grooves does not need to be removed after welding, and the surfaces of the grooves are polished. The invention ensures that the butt weld of the upper edge of the brake pad supporting and hanging seat and the upper cover plate of the side beam is fully melted through, and welds the brake pad supporting and hanging seat studs, the vertical plates of the side beam and the upper cover plate continuously, so that the arc withdrawing point of the weld is positioned at the end part of the brake pad supporting and hanging seat studs or extends to the base metal of the brake pad supporting and hanging seat, the one-time cross inspection qualification rate of the weld is improved, the butt weld of the upper edge of the brake pad supporting and hanging seat and the upper cover plate of the side beam is easy to melt through, and the weld quality of the brake pad supporting and hanging seat and the reliability of a framework are improved; the additional arrangement of the process vent hole is beneficial to implementation of welding of the bottom layer and implementation of repair of welding seams.
Description
Technical Field
The invention relates to the technical field of welding of railway vehicle bogies, in particular to a process for assembling and welding a brake lining lifting seat and a framework of a periphery welding seam type motor train unit bogie.
Background
As shown in figure 1, a brake pad supporting and hanging seat 1 of a motor train unit bogie is welded on a side beam 2 of a bogie frame to form a cavity structure with a circumferential welding line; the brake lining support hanging seat 1 is used for mounting a brake clamp of a motor train unit and belongs to safety-related key parts. The welding process generally comprises the steps of arranging an arc striking plate and an arc retracting plate at two ends of a welding seam, cutting the arc striking plate and the arc retracting plate after welding, but a cavity structure with a circumferential welding seam is formed between the brake pad supporting and hanging seat 1 and the side beam 2, so that the arc striking plate and the arc retracting plate cannot be additionally arranged on the structure. In the prior art, the brake pad supporting and hanging seat 1 of most projects adopts a structure that the upper edge of the brake pad supporting and hanging seat is butted with the upper cover plate of the side beam, the vertical ribs of the brake pad supporting and hanging seat and the vertical plates of the side beam form a T-shaped joint, all welding seams are non-penetration welding seams, and the joint points of the vertical ribs of the brake pad supporting and hanging seat, the vertical plates of the side beam and the upper cover plate of the side beam are usually arc starting and arc ending points of the welding seams, so that welding defects are easily generated in the welding process, and the welding quality cannot be guaranteed. Under the action of fatigue loads, the above-mentioned welding seam has the risk of cracking, seriously affecting the reliability of the frame.
Disclosure of Invention
The invention provides a process for assembling and welding a brake pad supporting and hanging seat and a frame of a motor train unit bogie with circumferential weld seams, and aims to solve the technical problems that in the existing assembling and welding process, the intersection point of a brake pad supporting and hanging seat vertical rib, a side beam vertical plate and a side beam upper cover plate is used as an arc starting point and an arc ending point of a weld seam, so that welding defects are easy to generate, the welding quality cannot be guaranteed, the weld seam has a cracking risk, and the reliability of the frame is seriously affected.
The technical scheme adopted by the invention for solving the technical problem is as follows:
the process for assembling and welding the brake pad supporting and hanging seat and the framework of the bogie of the motor train unit with circumferential weld seams is characterized by comprising the following steps of:
step one, preparing a brake pad supporting and hanging seat before welding: when the brake pad is assembled, the butt welding seam a formed by the upper edge of the brake pad supporting and hanging seat and the upper cover plate of the side beam is controlled according to the root gap of 1-4 mm and the misalignment of not more than 1 mm; performing tack welding and cleaning on points A and B at two ends of the butt welding line a and points C and D at the end parts of the brake pad supporting and hanging seat studs; the bottom of the brake pad supporting and hanging seat is provided with a process exhaust hole;
welding backing weld of a butt weld a at a position PA, connecting a point A at one end of the butt weld a to a point B at the other end, presetting grooves similar to weld grooves at the positions of the point A and the point B, and taking the grooves as arc starting points during welding;
step three, adjusting the position of the brake pad supporting and hanging seat welded in the step two, welding a T-shaped butt weld b formed by the brake pad supporting and hanging seat stud and the side beam vertical plate and a T-shaped butt weld d formed by the brake pad supporting and hanging seat stud and the side beam upper cover plate at the position PA, continuously welding the T-shaped butt weld b and the T-shaped butt weld d, continuously welding the position E of the end part of the brake pad supporting and hanging seat stud to the position F of the base metal of the brake pad supporting and hanging seat, presetting grooves similar to weld groove grooves at the positions of the E point and the F point, and taking the grooves as arc starting and ending points during welding;
step four, overturning the brake lining lifting seat welded in the step three, completing welding of the vertical ribs of the brake lining lifting seat on the other side according to the same method in the step three, and performing welding of multilayer welding seams in a staggered mode by the vertical ribs of the brake lining lifting seat on the two sides;
fifthly, adjusting the position of the brake pad supporting and hanging seat welded in the fourth step, completing welding of a T-shaped butt weld e formed by the brake pad supporting and hanging seat stud and the side beam vertical plate at the PB position, and continuously welding from one end of the T-shaped butt weld e to the other end;
step six, overturning the brake pad supporting and hanging seat welded in the step five to enable the butt weld a to be located at the position PA, and completing welding of a filling layer and a cover layer of the butt weld a, wherein the welding direction of each layer of weld is opposite to that of the previous layer;
step seven, after the butt weld a is qualified through flaw detection, polishing an arc starting section of a point A and an arc closing section of a point B at the end part of the butt weld a, and welding and plugging the process exhaust hole;
and step eight, grinding grooves with depths not less than 5mm internally tangent at the points C and D at the end parts of the vertical ribs of the brake pad supporting and hanging seat to form end socket welding seams f, and welding the end socket welding seams f to further finish the assembly welding process of the brake pad supporting and hanging seat and the framework.
The invention has the beneficial effects that: according to the assembly welding process, grooves similar to weld grooves are formed in non-welding seam area base metal connected with welding seams or the ends of brake pad lifting seat studs, welding starting and closing points are arranged in the grooves during welding, welding metal in the grooves does not need to be removed after welding, and the surfaces of the grooves are polished. The invention ensures that the butt weld joint of the upper edge of the brake pad supporting hanging seat and the upper cover plate of the side beam is completely melted through, and welds the brake pad supporting hanging seat stud, the vertical plate of the side beam and the upper cover plate continuously, so that the arc withdrawing point positions of the brake pad supporting hanging seat stud are positioned at the end part of the brake pad supporting hanging seat stud or extend to the base metal of the brake pad supporting hanging seat, the welding defects of the brake pad supporting hanging seat of the motor train unit can be greatly reduced, the one-time cross inspection qualification rate of the weld joint is improved, the butt weld joint of the upper edge of the brake pad supporting hanging seat and the upper cover plate of the side beam is easy to melt through, and the weld joint quality of the brake pad supporting hanging seat and the reliability of a framework are improved; the additional arrangement of the process vent hole is beneficial to implementation of welding of the bottom layer and implementation of repair of welding seams.
Drawings
FIG. 1 is a schematic structural view of a welding position of a brake pad supporting and hanging seat and a frame of a motor train unit bogie.
FIG. 2 is a schematic structural view of a brake pad supporting and hanging seat of a bogie of the motor train unit.
FIG. 3 is a schematic view of a welding structure of a butt welding line a in the process of assembly welding of a brake pad supporting and hanging seat and a frame of a circle welding line type motor train unit bogie of the invention.
FIG. 4 is a schematic view of a welding structure of a T-shaped butt weld b in the process of assembly welding of a brake pad supporting and hanging seat and a frame of a circle weld type motor train unit bogie of the invention.
FIG. 5 is a schematic view of a welding structure of a T-shaped butt weld e in the process of assembly welding of a brake pad supporting and hanging seat and a frame of the motor train unit bogie with circumferential weld according to the invention.
FIG. 6 is a schematic view of a welding structure of a head welding seam f in the process of assembly welding of a brake pad supporting and hanging seat and a frame of the motor train unit bogie with circumferential welding seams.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention discloses a process for assembling and welding a brake pad supporting and hanging seat and a framework of a circumferential weld type motor train unit bogie, which optimizes the preparation before welding, the positioning welding position, the welding position and the sequence of the brake pad supporting and hanging seat, and comprises the following steps: setting the assembly clearance and the misalignment range of the brake pad supporting and hanging seat, additionally arranging a process vent hole, selecting the two ends of a butt welding line and the end part of a T-shaped welding line as positioning welding positions, welding other welding lines except a fillet welding line at a PB position at a PA position, setting the arc starting point position of the welding line at the end part of a vertical rib of the brake pad supporting and hanging seat or extending to a base metal of the brake pad supporting and hanging seat and the like, and achieving the purposes of reducing welding defects and improving the quality of the welding line.
As shown in fig. 2 to 6, the process for assembling and welding the brake pad supporting and hanging seat and the frame of the motor train unit bogie with circumferential weld seams comprises the following steps:
step one, preparing a brake pad supporting and hanging seat 1 before welding: when the brake pad is assembled, a butt welding seam a formed by the upper edge 1-1 of the brake pad supporting and hanging seat and the upper cover plate 2-1 of the side beam is controlled according to the root gap of 1-4 mm and the misalignment of not more than 1 mm; positioning welding is carried out and cleaning is carried out on the points A and B at the two ends of the butt-joint welding line a and the points C and D at the end parts of the brake pad supporting and hanging seat vertical ribs 1-2; the bottom of the brake pad supporting and hanging seat 1 is provided with a process exhaust hole 1-3;
welding backing weld of a butt weld a at a position PA, connecting a point A at one end of the butt weld a to a point B at the other end, presetting grooves similar to weld grooves at the positions of the point A and the point B, and taking the grooves as arc starting points during welding;
step three, adjusting the position of the brake pad supporting and hanging seat 1 welded in the step two, welding a T-shaped butt weld b formed by the brake pad supporting and hanging seat vertical ribs 1-2 and the side beam vertical plates 2-2 and a T-shaped butt weld d formed by the brake pad supporting and hanging seat vertical ribs 1-2 and the side beam upper cover plate 2-1 at the position PA, continuously welding the T-shaped butt weld b and the T-shaped butt weld d, continuously welding a base material position F of the brake pad supporting and hanging seat 1 from an end E point of the brake pad supporting and hanging seat vertical ribs 1-2, presetting grooves similar to weld groove positions at the E point and the F point, taking the grooves as arc starting and ending points during welding, and polishing the surface without removing welding metal in the grooves after welding;
step four, overturning the brake pad supporting and hanging seat 1 welded in the step three, completing welding of the vertical ribs 1-2 of the brake pad supporting and hanging seat on the other side according to the same method in the step three, and performing welding of multilayer welding seams by staggering the vertical ribs 1-2 of the brake pad supporting and hanging seats on the two sides;
fifthly, adjusting the position of the brake pad supporting and hanging seat 1 welded in the fourth step, completing the welding of a T-shaped butt weld e formed by the brake pad supporting and hanging seat stud 1-2 and the side beam vertical plate 2-2 at the position PB, and continuously welding from one end of the T-shaped butt weld e to the other end;
step six, overturning the brake lining support hanging seat 1 welded in the step five to enable the butt weld a to be located at the position PA, and completing welding of a filling layer and a cover surface layer of the butt weld a, wherein the welding direction of each layer of weld is opposite to that of the previous layer;
step seven, after the butt weld a is qualified through flaw detection, polishing an arc starting section of a point A and an arc closing section of a point B at the end part of the butt weld a, and welding and plugging process exhaust holes 1-3;
and step eight, grinding grooves with the depths of not less than 5mm inscribed at the points C and D at the end parts of the vertical ribs 1-2 of the brake pad supporting and hanging seat to form end socket welding seams f, and welding the end socket welding seams f to further finish the process of assembling and welding the brake pad supporting and hanging seat 1 and the framework.
Claims (1)
1. The process for assembling and welding the brake lining supporting and hanging seat and the framework of the bogie of the motor train unit with circumferential weld joints is characterized by comprising the following steps of:
firstly, preparing a brake pad supporting and hanging seat (1) before welding: when the brake pad is assembled, a butt welding seam a formed by the upper edge (1-1) of the brake pad supporting and hanging seat and the upper cover plate (2-1) of the side beam is controlled according to the root clearance of 1-4 mm and the misalignment of not more than 1 mm; performing tack welding and cleaning on points A and B at two ends of the butt welding line a and points C and D at the end parts of the brake pad supporting and hanging seat studs (1-2); a process exhaust hole (1-3) is arranged at the bottom of the brake pad supporting and hanging seat (1);
welding backing weld of a butt weld a at a position PA, connecting a point A at one end of the butt weld a to a point B at the other end, presetting grooves similar to weld grooves at the positions of the point A and the point B, and taking the grooves as arc starting points during welding;
step three, adjusting the position of the brake pad supporting and hanging seat (1) welded in the step two, welding a T-shaped butt weld b formed by the brake pad supporting and hanging seat stud (1-2) and the side beam vertical plate (2-2) and a T-shaped butt weld d formed by the brake pad supporting and hanging seat stud (1-2) and the side beam upper cover plate (2-1) at the position PA, continuously welding the T-shaped butt weld b and the T-shaped butt weld d, continuously welding the brake pad supporting and hanging seat stud (1-2) from the end E point to the base material position F of the brake pad supporting and hanging seat (1), presetting grooves similar to weld groove grooves at the E point and the F point, and taking the grooves as arc starting and closing points during welding;
step four, turning over the brake pad supporting and hanging seat (1) welded in the step three, completing welding of the vertical ribs (1-2) of the brake pad supporting and hanging seat at the other side according to the same method in the step three, and performing welding of multilayer welding seams in a staggered mode on the vertical ribs (1-2) of the brake pad supporting and hanging seats at the two sides;
fifthly, adjusting the position of the brake pad supporting and hanging seat (1) welded in the fourth step, completing the welding of a T-shaped butt weld e formed by the brake pad supporting and hanging seat stud (1-2) and the side beam vertical plate (2-2) in the PB position, and continuously welding from one end of the T-shaped butt weld e to the other end;
step six, overturning the brake pad supporting and hanging seat (1) welded in the step five to enable the butt weld a to be located at the position PA, and completing welding of a filling layer and a cover surface layer of the butt weld a, wherein the welding direction of each layer of weld is opposite to that of the previous layer;
step seven, after the butt weld a is qualified through flaw detection, polishing an arc starting section of a point A and an arc closing section of a point B at the end part of the butt weld a, and welding and plugging the process exhaust holes (1-3);
and step eight, grinding grooves with the depths of not less than 5mm inscribed at the points C and D at the end parts of the brake pad supporting and hanging seat studs (1-2) to form end socket welding seams f, and welding the end socket welding seams f to further finish the process of assembling and welding the brake pad supporting and hanging seat (1) and the framework.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111141295.0A CN113681115B (en) | 2021-09-28 | 2021-09-28 | Process for assembling and welding brake pad supporting and hanging seat and framework of bogie of motor train unit with circumferential weld seam |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111141295.0A CN113681115B (en) | 2021-09-28 | 2021-09-28 | Process for assembling and welding brake pad supporting and hanging seat and framework of bogie of motor train unit with circumferential weld seam |
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| CN113681115A CN113681115A (en) | 2021-11-23 |
| CN113681115B true CN113681115B (en) | 2022-08-02 |
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| GB2614714A (en) * | 2022-01-12 | 2023-07-19 | Lead Tech Limited | Joining of lead and lead alloys |
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2021
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