CN113333932A - Resistance spot welding repair device and method for stainless steel vehicle body - Google Patents
Resistance spot welding repair device and method for stainless steel vehicle body Download PDFInfo
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- CN113333932A CN113333932A CN202110593421.XA CN202110593421A CN113333932A CN 113333932 A CN113333932 A CN 113333932A CN 202110593421 A CN202110593421 A CN 202110593421A CN 113333932 A CN113333932 A CN 113333932A
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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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/10—Spot welding; Stitch welding
- B23K11/11—Spot welding
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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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/34—Preliminary treatment
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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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/36—Auxiliary equipment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
- B23P23/06—Metal-working plant comprising a number of associated machines or apparatus
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Abstract
The invention provides a device and a method for repairing a stainless steel vehicle body by resistance spot welding, wherein the device comprises an arc striking plate and an arc closing plate, the arc striking plate and the arc closing plate are fixedly arranged on the outer side wall of a first stainless steel plate far away from a second stainless steel plate through a clamping piece, the arc striking plate and the arc closing plate are symmetrically arranged on two sides of a welding spot to be repaired, the arc striking plate and the arc closing plate are positioned on the same straight line, grooves are respectively arranged at one ends of the arc striking plate and the arc closing plate close to the welding spot to be repaired, and the lower edge positions of the grooves are tangent to the edge positions of the welding spot to be repaired; a backing plate is fixedly arranged on the outer side wall, far away from the first stainless steel plate, of the second stainless steel plate through a clamping piece, a water inlet and a water outlet are respectively arranged at two ends of the backing plate, the water inlet is connected with a water inlet pipe through a water inlet pipe connector, and the water outlet is connected with a water outlet pipe communicated with the water inlet pipe through a water outlet pipe connector; the method solves the problem of welding deformation of the stainless steel plate of the vehicle body in the repairing process, and the flatness of the surface of the workpiece repaired by the method has no obvious difference with that before welding.
Description
Technical Field
The invention belongs to the technical field of rail vehicle welding, and particularly relates to a device and a method for repairing a stainless steel vehicle body by resistance spot welding.
Background
The resistance spot welding process is widely applied by the advantages of heat concentration, small welding deformation, high automation efficiency, low cost of metal-free filling and the like, particularly in the application of welding of stainless steel car bodies of rail vehicles, more than 2-3 ten thousand welding spots are on average on each car body, the quality of welding seams is influenced by the reasons of workpiece assembly gaps, equipment stability and the like, the defects that individual welding spots can be burnt through and the like are avoided, the diameter of the usually burnt welding spots is about 6-8 mm, the hole diameter is small, TIG welding is usually adopted for repairing, but the welding seams are almost filled at the moment of arc starting of a welding gun, the temperature of the welding seams is too low, electric arcs are difficult to touch the roots of the welding seams, the defects that the roots are not fused, craters are reduced and the like are easily generated, and the welding quality is difficult to ensure; polishing the weld reinforcement after repair can cause polishing marks and also affect the attractiveness of the vehicle body, particularly for non-coated stainless steel vehicle bodies, if the defects are generated in passenger vision areas such as side walls and wire-drawing wall plates of end walls, the polishing marks can seriously affect the attractiveness of the vehicle body; in addition, the stainless steel car body adopts a cold-work hardening austenitic stainless steel thin plate with the thickness of 0.8-4.0 mm, is influenced by the physical characteristics of austenitic stainless steel, is easy to generate wave and bending deformation after welding, and is particularly important for improving the qualification rate of one-time repair welding, avoiding the deformation caused by repeated repair welding heat input and controlling the welding deformation; therefore, a device and a method for repairing a stainless steel car body by resistance spot welding are needed, so that the quality and the effect of the car body repair can meet the engineering use requirements.
Disclosure of Invention
In view of the above, the invention aims to provide a device and a method for repairing a stainless steel car body by resistance spot welding, so as to solve the problems of poor welding quality, large deformation after welding, insufficient surface aesthetics after repair and the like in the process of repairing the burn-through defect of the resistance spot welding.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a resistance spot welding repair device for a stainless steel car body is used for repairing welding spots to be repaired on a first stainless steel plate and a second stainless steel plate and comprises an arc striking plate and an arc closing plate, wherein the arc striking plate and the arc closing plate are fixedly arranged on the outer side wall of the first stainless steel plate far away from the second stainless steel plate through a clamping piece, the arc striking plate and the arc closing plate are symmetrically arranged on two sides of the welding spots to be repaired, the arc striking plate and the arc closing plate are positioned on the same straight line, grooves are formed in the ends, close to the welding spots to be repaired, of the arc striking plate and the arc closing plate, and the lower edge positions of the grooves are tangent to the edge positions of the welding spots to be repaired;
the outer side wall of the stainless steel plate II, far away from the stainless steel plate I, is fixedly provided with a base plate through a clamping piece, the two ends of the base plate are respectively provided with a water inlet and a water outlet, the water inlet is connected with a water inlet pipe through a water inlet pipe connector, and the water outlet is connected with a water outlet pipe communicated with the water inlet pipe through a water outlet pipe connector.
Furthermore, internal threads are arranged at the water inlet and the water outlet of the backing plate, and the backing plate is in threaded connection with a water inlet pipe joint and a water outlet pipe joint;
the end face of the top end of the base plate is provided with an arc-shaped notch corresponding to the welding point to be repaired.
Furthermore, the arc striking plate and the arc retracting plate are made of austenitic stainless steel, and the backing plate is made of red copper materials.
The invention also provides a resistance spot welding repair method for a stainless steel car body resistance spot welding repair device according to any one of claims 1 to 3, which comprises the following steps:
s1, preprocessing a welding spot to be repaired;
s2, fixedly arranging the backing plate on the outer side wall of the second stainless steel plate far away from the first stainless steel plate through a clamping piece;
s3, fixedly arranging the arc striking plate and the arc retracting plate on the outer side wall of the first stainless steel plate far away from the second stainless steel plate through a clamping piece;
s4, correspondingly arranging a plurality of groups of fixtures around the welding point to be repaired, so that the first stainless steel plate at the welding point to be repaired is tightly attached to the second stainless steel plate, and the first stainless steel plate and the second stainless steel plate are prevented from being deformed in the welding process;
s5, connecting the ground wire of the welding machine with the first stainless steel plate;
s6, welding the welding spot to be repaired by using a welding gun;
s7, cooling the position to be welded to room temperature, and then removing the arc striking plate, the arc closing plate, the base plate and the clamping piece;
s8, repairing the surface of the weld joint by using an angle grinder;
s9, carrying out PT detection on the repaired surface, and finishing the repairing work without errors; if the defects appear during detection, the steps are circulated to carry out repair work on the welding spots to be repaired.
Further, in step S1, the preprocessing the welding spot to be repaired includes: cleaning splashes, oxides and other impurities at the welding spots to be repaired; to the solder joint that treats of unilateral breakdown and restoreing, adopt the straight mill of button head to treat that the repair solder joint inboard is polished, what polish should be degree of depth and exceed the breakdown board thickness at the solder joint that treats the repair, and expose metallic luster completely, to the solder joint that treats of puncturing into the through-hole, adopt the electric drill to polish the reaming to the through-hole inside wall.
Further, the aperture ground in step S1 should be not less than 4 times the thickness of the punctured stainless steel plate, and is 8mm at minimum.
Further, in step S6, the welding repair is performed by a TIG welding method, and the filler is ER308LSi with a diameter of Φ 1.0mm, a tungsten electrode: EWCE-2 phi 2.4mm, gas flow 8-12L/min, current: 70-90A, and welding at the flat welding position.
Further, the specific welding step of step S6 is as follows: s601, adjusting welding arcing current to enable the electric arc to be in an injection shape, arcing at the point A of the arc striking plate, moving a welding gun to a breakdown hole formed by the welding point to be repaired along the tangent point of the arc striking plate and the welding point to be repaired after the electric arc is stabilized, at the moment, the welding gun inclines forwards for a certain angle, the welding gun stays for a short time, and the fusion of the root is ensured;
and S602, switching to welding current, carrying out quick swing welding by the welding gun in a Z shape until the striking hole is filled, moving the welding gun to a point B of the arc-retracting plate along the tangent point of the arc-retracting plate and the striking hole to carry out arc retracting, and leaving the work after delaying gas protection.
Further, the repairing the welding seam surface in the step S8 specifically includes: for the non-passenger visual field area, an electric angle grinder is used for carrying out rough grinding, the excess height generated by the welding line is ground to be flat, and the grinding trace is regular circle or square;
and for the wire drawing surface of the passenger visual field area, performing fine grinding by using an electric angle grinder on the basis of coarse grinding, polishing the fine grinding area by using a No. 120 polishing sheet, and then performing wire drawing by using an electric wire drawing machine, wherein the mesh number of the wire drawing cloth is consistent with the mesh number and the type of the stainless steel plate, and when the surface of a workpiece has no fine grinding trace and the wire drawing pattern has no obvious difference with the pattern of the stainless steel plate, wiping the surface by using a scouring pad to eliminate chromatic aberration.
Compared with the prior art, the device and the method for repairing the stainless steel car body by resistance spot welding have the following beneficial effects:
(1) the device and the method for repairing the stainless steel car body by resistance spot welding solve the problem of welding deformation of the stainless steel plate of the car body in the repairing process, and the flatness of the surface of a workpiece repaired by the method has no obvious difference with that before welding;
(2) the device and the method for repairing the stainless steel car body by resistance spot welding have attractive repairing traces, and particularly the repairing traces have no obvious difference from the original plate material when the surface of the exposed drawn wire of the car body is repaired;
(3) the device and the method for repairing the stainless steel car body by resistance spot welding have high welding quality and obviously improve the one-time repairing qualified rate.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a structural diagram of a resistance spot welding repairing device for a stainless steel car body according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a welding operation according to an embodiment of the present invention;
fig. 3 is a schematic view of an angle of a welding gun according to an embodiment of the present invention.
Description of reference numerals:
1-arc striking plate; 2-arc closing plate; 3-stainless steel plate I; 4-stainless steel plate II; 5-backing plate; 6-water inlet pipe joint; 7-a water outlet pipe joint; 8-beveling; 9-welding spots to be repaired; 10-a cooling water pipeline; 11-an arc-shaped recess; 12-welding gun.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Please refer to fig. 1, a resistance spot welding repair device for a stainless steel car body, which is used for repairing a welding spot 9 to be repaired on a first stainless steel plate 3 and a second stainless steel plate 4, and comprises an arc striking plate 1 and an arc receiving plate 2, wherein the arc striking plate 1 and the arc receiving plate 2 are fixedly arranged on the outer side wall of the first stainless steel plate 3 far away from the second stainless steel plate 4 through a clamping piece, the clamping piece adopted by the technical scheme is the prior art, further description is omitted in the patent application, the arc striking plate 1 and the arc receiving plate 2 are symmetrically arranged on two sides of the welding spot 9 to be repaired, the arc striking plate 1 and the arc receiving plate 2 are positioned on the same straight line, one ends of the arc striking plate 1 and the arc receiving plate 2 close to the welding spot 9 to be repaired are both provided with grooves 8, and the lower edge positions of the grooves 8 are tangent to the edge positions of the welding spot 9 to be repaired, by arranging the arc striking plate 1 and the arc retracting plate 2, the problems of incomplete fusion, crater shrinkage and the like caused by over-low arc striking temperature are avoided;
stainless steel plate two 4 is kept away from on the lateral wall of stainless steel plate one 3 through the fixed backing plate 5 that is provided with of fastener, the both ends of backing plate 5 are equipped with water inlet and delivery port respectively, the water inlet is connected with the inlet tube through inlet tube joint 6, the delivery port is connected with the outlet pipe with the inlet tube intercommunication through outlet pipe joint 7, through setting up backing plate 5, the inlet tube is connected at the water inlet of backing plate 5, the outlet pipe is connected to the delivery port, the inlet tube is flowed through in proper order to the cooling water, backing plate and outlet pipe form the cooling water course, the heat that produces when can taking away the welding fast, reduce the deformation of stainless steel plate one 3 and stainless steel plate two, guarantee penetration and the shaping of back welding seam.
Internal threads are arranged at the water inlet and the water outlet of the backing plate 5, and the backing plate 5 is in threaded connection with a water inlet pipe joint 6 and a water outlet pipe joint 7;
be equipped with the arc notch 11 that corresponds with waiting to restore solder joint 9 on the 5 top terminal surfaces of backing plate, the diameter is greater than the perforation diameter 2mm that waits to restore solder joint 9 to form, and arc notch 11 degree of depth 1 ~ 1.5mm, mainly used bearing back welding seam, the control back welding seam takes shape, the welding seam penetration of being convenient for.
The arc striking plate 1 and the arc receiving plate 2 are made of austenitic stainless steel, the thickness is not less than 4mm, arc striking and arc receiving are avoided, the arc striking plate and the arc receiving plate are welded to a workpiece, the width is not less than 20mm, the length can be adjusted according to actual working conditions, the stability of the electric arc of arc striking and arc receiving is guaranteed, 45-60-degree grooves are polished on the width direction of the arc striking plate and the arc receiving plate, no blunt edge exists, the electric arc can be stably transited, and the backing plate 5 is made of red copper materials and is in specification: 10X50X50mm, for being suitable for different operating modes, length and width size can be made into multiple specification, and the inside central point of backing plate puts the cooling water pipeline of processing diameter 4mm, and both ends communicate with water inlet and delivery port respectively.
The invention also provides a resistance spot welding repair method for a stainless steel car body resistance spot welding repair device according to any one of claims 1 to 3, which comprises the following steps:
s1, preprocessing the welding spot 9 to be repaired;
s2, fixedly arranging the backing plate 5 on the outer side wall of the stainless steel plate II 4 far away from the stainless steel plate I3 through a clamping piece;
s3, fixedly arranging the arc striking plate 1 and the arc retracting plate 2 on the outer side wall of the first stainless steel plate 3 far away from the second stainless steel plate 4 through a clamping piece;
s4, correspondingly arranging a plurality of groups of fixtures around the welding spot 9 to be repaired, enabling the first stainless steel plate 3 at the welding spot 9 to be repaired to be tightly attached to the second stainless steel plate 4, and preventing the first stainless steel plate 3 and the second stainless steel plate 4 from being deformed in the welding process;
s5, connecting the ground wire of the welding machine with the first stainless steel plate 3 to avoid the generated electric arc from damaging the workpiece;
s6, welding the welding spot 9 to be repaired by using the welding gun 12;
s7, cooling the position to be welded to room temperature, and then removing the arc striking plate 1, the arc closing plate 2, the base plate 5 and the clamping piece;
s8, repairing the surface of the weld joint by using an angle grinder;
s9, carrying out PT detection on the repaired surface, and finishing the repairing work without errors; if the defect occurs during detection, the steps are circulated to repair the welding spot 9 to be repaired.
In step S1, the preprocessing the welding spot 9 to be repaired includes: cleaning splashes, oxides and other impurities at the welding spots 9 to be repaired; and (3) polishing the inner side of the to-be-repaired welding spot 9 which is punctured on one side by adopting a round head straight grinding machine, wherein the polishing depth exceeds the thickness of a puncture plate where the to-be-repaired welding spot 9 is located, the metal luster is completely exposed, and the to-be-repaired welding spot 9 which is punctured into a through hole is polished and reamed by adopting an electric drill to the inner side wall of the through hole.
The aperture ground in the step S1 should be not less than 4 times of the thickness of the punctured stainless steel plate, and the minimum aperture is 8 mm.
In step S6, the welding repair is performed by a TIG welding method, and the filling material is ER308LSi with a diameter of Φ 1.0mm, a tungsten electrode: EWCE-2 phi 2.4mm, gas flow 8-12L/min, current: 70-90A, and welding at the flat welding position.
As shown in fig. 2 and 3, the specific welding step of step S6 is as follows: s601, adjusting welding arcing current to enable the electric arc to be in an injection shape, arcing at the point A of the arc striking plate, moving the welding gun 12 to a breakdown hole formed by the welding spot 9 to be repaired along the tangent point of the arc striking plate 1 and the welding spot 9 to be repaired after the electric arc is stabilized, wherein the welding gun 12 inclines forwards by about 75 degrees at the moment, and the welding gun 12 stays for a short time to ensure root fusion;
s602, switching to welding current, enabling the welding gun 12 to rapidly swing and weld in a Z shape until the punched hole is filled, enabling the welding gun 12 to move to a point B of the arc-retracting plate along the tangent point of the arc-retracting plate 2 and the punched hole to retract, enabling the welding gun 12 to leave the workpiece after delaying gas protection, cooling the temperature of the workpiece to be room temperature from the beginning of welding, keeping cooling water circulation in the backing plate, enabling the front welding line to be slightly convex, and enabling the residual height not to exceed 3 mm. During multi-layer and multi-pass welding, interlayer cleaning is taken care of, interlayer temperature is controlled, and cooling to room temperature is best carried out before next welding.
The repairing of the weld surface in the step S8 specifically includes: for the non-passenger visual field area, an electric angle grinder is used for carrying out rough grinding, the excess height generated by the welding line is ground to be flat, and the grinding trace is regular circle or square;
and for the wire drawing surface of the passenger visual field area, performing fine grinding by using an electric angle grinder on the basis of coarse grinding, polishing the fine grinding area by using a No. 120 polishing sheet, and then performing wire drawing by using an electric wire drawing machine, wherein the mesh number of the wire drawing cloth is consistent with the mesh number and the type of the stainless steel plate, and when the surface of a workpiece has no fine grinding trace and the wire drawing pattern has no obvious difference with the pattern of the stainless steel plate, wiping the surface by using a scouring pad to eliminate chromatic aberration.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. The utility model provides a be used for stainless steel automobile body resistance spot welding prosthetic devices for repair wait to restore solder joint (9) on stainless steel board one (3) and stainless steel board two (4), its characterized in that: the welding point repairing device comprises an arc striking plate (1) and an arc closing plate (2), wherein the arc striking plate (1) and the arc closing plate (2) are fixedly arranged on the outer side wall, far away from a stainless steel plate II (4), of a stainless steel plate I (3) through a clamping piece, the arc striking plate (1) and the arc closing plate (2) are symmetrically arranged on two sides of a welding point (9) to be repaired, the arc striking plate (1) and the arc closing plate (2) are located on the same straight line, grooves (8) are formed in one ends, close to the welding point (9) to be repaired, of the arc striking plate (1) and the arc closing plate (2), and the lower edge positions of the grooves (8) are tangent to the edge positions of the welding point (9) to be repaired;
the outer side wall, far away from the first stainless steel plate (3), of the second stainless steel plate (4) is fixedly provided with a base plate (5) through a clamping piece, the two ends of the base plate (5) are respectively provided with a water inlet and a water outlet, the water inlet is connected with a water inlet pipe through a water inlet pipe connector (6), and the water outlet is connected with a water outlet pipe communicated with the water inlet pipe through a water outlet pipe connector (7).
2. The resistance spot welding repair device for a stainless steel vehicle body according to claim 1, characterized in that: internal threads are arranged at the water inlet and the water outlet of the backing plate (5), and the backing plate (5) is in threaded connection with the water inlet pipe joint (6) and the water outlet pipe joint (7);
the end face of the top end of the backing plate (5) is provided with an arc-shaped notch (11) corresponding to the welding point (9) to be repaired.
3. The resistance spot welding repair device for a stainless steel vehicle body according to claim 1, characterized in that: the arc striking plate (1) and the arc retracting plate (2) are made of austenitic stainless steel, and the backing plate (5) is made of red copper material.
4. The resistance spot welding repair method for a stainless steel car body resistance spot welding repair device according to any one of claims 1 to 3, characterized by comprising the steps of:
s1, preprocessing a welding spot (9) to be repaired;
s2, fixedly arranging the backing plate (5) on the outer side wall of the stainless steel plate II (4) far away from the stainless steel plate I (3) through a clamping piece;
s3, fixedly arranging the arc striking plate (1) and the arc retracting plate (2) on the outer side wall of the stainless steel plate I (3) far away from the stainless steel plate II (4) through a clamping piece;
s4, correspondingly arranging a plurality of groups of fixtures around the welding spot (9) to be repaired, enabling the first stainless steel plate (3) at the welding spot (9) to be repaired to be tightly attached to the second stainless steel plate (4), and preventing the first stainless steel plate (3) and the second stainless steel plate (4) from being deformed in the welding process;
s5, connecting the ground wire of the welding machine with the first stainless steel plate (3);
s6, welding the welding spot (9) to be repaired by using a welding gun (12);
s7, cooling the position to be welded to room temperature, and then removing the arc striking plate (1), the arc closing plate (2), the base plate (5) and the clamping piece;
s8, repairing the surface of the weld joint by using an angle grinder;
s9, carrying out PT detection on the repaired surface, and finishing the repairing work without errors; if defects appear during detection, the steps are circulated to carry out repair work on the welding spot (9) to be repaired.
5. The resistance spot welding repair method according to claim 4, characterized in that: in step S1, the preprocessing the welding spot (9) to be repaired includes: cleaning splashes, oxides and other impurities at the welding spots (9) to be repaired; to the solder joint (9) of treating restoreing of unilateral breakdown, adopt the straight mill of button head to treat that to restore solder joint (9) inboard and polish, what polish should be the degree of depth and exceed the breakdown board thickness at the solder joint (9) place of treating restoreing, and expose metallic luster completely, to the solder joint (9) of treating restoreing that punctures into the through-hole, adopt the electric drill to polish the reaming to the through-hole inside wall.
6. The resistance spot welding repair method according to claim 5, characterized in that: the aperture ground in the step S1 should be not less than 4 times of the thickness of the punctured stainless steel plate, and the minimum aperture is 8 mm.
7. The resistance spot welding repair method according to claim 4, characterized in that: in step S6, the welding repair is performed by a TIG welding method, and the filling material is ER308LSi with a diameter of Φ 1.0mm, a tungsten electrode: EWCE-2 phi 2.4mm, gas flow 8-12L/min, current: 70-90A, and welding at the flat welding position.
8. The resistance spot welding repair method according to claim 7, characterized in that: the specific welding step of step S6 is as follows: s601, adjusting welding arcing current to enable an electric arc to be in an injection shape, arcing at a point A of an arc striking plate (1), moving a welding gun (12) to a breakdown hole formed by a welding point (9) to be repaired along a tangent point of the arc striking plate (1) and the welding point (9) to be repaired after the electric arc is stabilized, at the moment, inclining the welding gun (12) forward by a certain angle, and temporarily stopping the welding gun (12) to ensure root fusion;
and S602, switching to welding current, carrying out quick swing welding by the welding gun (12) in a Z shape until the striking hole is filled, moving the welding gun (12) to a point B of the arc-receiving plate (2) along the tangent point of the arc-receiving plate (2) and the striking hole to carry out arc-receiving, and leaving the work after delaying gas protection.
9. The resistance spot welding repair method according to claim 7, characterized in that: the repairing of the weld surface in the step S8 specifically includes: for the non-passenger visual field area, an electric angle grinder is used for carrying out rough grinding, the excess height generated by the welding line is ground to be flat, and the grinding trace is regular circle or square;
and for the wire drawing surface of the passenger visual field area, performing fine grinding by using an electric angle grinder on the basis of coarse grinding, polishing the fine grinding area by using a No. 120 polishing sheet, and then performing wire drawing by using an electric wire drawing machine, wherein the mesh number of the wire drawing cloth is consistent with the mesh number and the type of the stainless steel plate, and when the surface of a workpiece has no fine grinding trace and the wire drawing pattern has no obvious difference with the pattern of the stainless steel plate, wiping the surface by using a scouring pad to eliminate chromatic aberration.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113941796A (en) * | 2021-12-20 | 2022-01-18 | 四川明日宇航工业有限责任公司 | High-precision tailor-welding process for stainless steel box type structural part |
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| CN113941796B (en) * | 2021-12-20 | 2022-03-08 | 四川明日宇航工业有限责任公司 | High-precision tailor-welding process for stainless steel box type structural part |
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| CN113333932B (en) | 2023-03-24 |
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