CN114749821B

CN114749821B - Welding method

Info

Publication number: CN114749821B
Application number: CN202210579783.8A
Authority: CN
Inventors: 刘斌; 马涛
Original assignee: Wuhan Zhonggu Lianchuang Photoelectric Technology Co ltd
Current assignee: Wuhan Zhonggu Lianchuang Photoelectric Technology Co ltd
Priority date: 2022-05-25
Filing date: 2022-05-25
Publication date: 2023-05-05
Anticipated expiration: 2042-05-25
Also published as: CN114749821A

Abstract

The embodiment of the application provides a welding method, belongs to the technical field of welding, and the welding method is used for welding a first welding piece and a second welding piece, and projection is carried out along the arrangement direction of the first welding piece and the second welding piece, a projection area formed by surrounding an outer contour line of a projection area of the first welding piece and an outer contour line of a projection area of the second welding piece is a welding area with a polygonal outer contour line, and the welding method comprises the following steps: determining a plurality of welding positions for welding the first weldment and the second weldment, wherein at least three welding positions are first welding positions, the first welding positions correspond to the intersection points of two adjacent side lines of the polygon, and the first welding positions are closer to the corresponding intersection points relative to other welding positions; and (3) positioning welding: welding the first weldment and the second weldment at a first welding location; after tack welding, the first weldment and the second weldment are welded at other welding positions than the first welding position among all the welding positions. The welding method improves the welding strength of the first welding piece and the second welding piece.

Description

Welding method

Technical Field

The application relates to the technical field of welding, in particular to a welding method.

Background

During the processing of parts, situations may be encountered in which it is necessary to weld two parts together. In the related art, there is a problem that the welding strength between two parts is insufficient.

Disclosure of Invention

In view of the foregoing, it is desirable to provide a welding method to improve welding strength.

To achieve the above object, in a first aspect of the embodiments of the present application, a welding method is provided for welding a first welding member and a second welding member, an arrangement direction of the first welding member and the second welding member is a preset direction, and the first welding member and the second welding member are projected along the preset direction, a projection area defined by an outer contour line of a projection area of the first welding member and an outer contour line of the projection area of the second welding member is a welding area, and an outer contour line of the welding area is polygonal, the welding method includes:

determining a plurality of welding positions for welding a first welding piece and a second welding piece, wherein at least three welding positions are first welding positions, the first welding positions are in one-to-one correspondence with the intersection points of two adjacent side lines of the polygon, the distance between the intersection points of the two adjacent side lines of the polygon and the corresponding first welding positions is a first distance, and the distance between the intersection points of the two adjacent side lines of the polygon and other welding positions except the corresponding first welding positions in all the welding positions is a second distance, wherein the second distance is larger than the first distance;

and (3) positioning welding: welding the first weldment and the second weldment at the first welding location;

after the tack welding, the first weldment and the second weldment are welded at other welding positions than the first welding position among all the welding positions.

In one embodiment, welding the first weldment and the second weldment at the first welding location includes: and welding the first welding piece and the second welding piece at each first welding position in sequence along the circumferential direction.

In an embodiment, the polygon is a quadrilateral, and welding the first weldment and the second weldment at the first welding position includes:

welding the first weldment and the second weldment at two first welding positions corresponding to one diagonal line of the quadrangle;

and welding the first welding piece and the second welding piece at two first welding positions corresponding to the other diagonal line of the quadrangle.

In an embodiment, the first weldment includes a main weldment and an insert, the main weldment has a receiving hole, the insert is located in the receiving hole, a projection area formed by projecting the main weldment along a preset direction is a first projection area, a projection area formed by projecting the insert along the preset direction is a second projection area, the first welding position is located in the first projection area so that the main weldment and the second weldment are welded at the first welding position, at least one welding position is a second welding position, and the second welding position is located in the second projection area; welding the first weldment and the second weldment at other welding positions than the first welding position among all the welding positions, including: and welding the insert and the second weldment at the second welding position.

In an embodiment, at least one welding position located in the first projection area is a third welding position, an area between every two adjacent first welding positions along the circumferential direction is a spacing area, and the third welding position is arranged in at least one spacing area; after welding the insert and the second weldment at the second welding location, welding the first weldment and the second weldment at other welding locations of all the welding locations than the first welding location, further comprising: and welding the main welding piece and the second welding piece at the third welding position.

In an embodiment, at least one of the welding positions located in the second projection area is a fourth welding position located between two circumferentially adjacent second welding positions; after welding the main weldment and the second weldment at the third welding location, welding the first weldment and the second weldment at other welding locations of all the welding locations than the first welding location, further comprising: and welding the insert and the second weldment at the fourth welding position.

In one embodiment, the insert has a wide end and a narrow end, the wide end having a width greater than the width of the narrow end, and the second weld location and the fourth weld location are both located at the wide end.

In an embodiment, at least a preset number of spacers is a target spacer, the second welding position and the third welding position are alternatively set in the target spacer, and the preset number is a difference between the total number of spacers and 1.

In one embodiment, the first weldment and the second weldment are partially melted by laser to weld the first weldment and the second weldment, and the welding position is located in an overlapping area of the projection area of the first weldment and the projection area of the second weldment along the preset direction; and/or the welding mode between the first welding piece and the second welding piece is spot welding.

In one embodiment, the first weldment and the second weldment are both plate-shaped; and/or projecting along the preset direction, wherein the outer contour line of the projection area of the first welding piece is positioned in the outer contour line of the projection area of the second welding piece, and the welding area is an area surrounded by the outer contour line of the projection area of the first welding piece.

According to the welding method, the first weldment and the second weldment are welded at all first welding positions, the intersection points of every two adjacent side lines of the polygon are in one-to-one correspondence with the first welding positions, so that the first weldment and the second weldment are welded near the intersection points of every two adjacent side lines of the polygon, then the first weldment and the second weldment are welded at other welding positions, the first weldment and the second weldment are heated uniformly along the circumferential direction of a welding area, the stress displacement of the first weldment relative to the second weldment is smaller, the first weldment and the second weldment are welded at the first welding positions near the intersection points of every two adjacent side lines of the polygon, the first weldment and the second weldment can be restrained from being welded at the welding positions of the first weldment and the second weldment after the welding is finished, the stress displacement of the first weldment relative to the second weldment is smaller, and the first and the empty welding strength of the first weldment can be relieved, and the empty welding strength of the first weldment can be improved.

Drawings

Fig. 1 is a schematic diagram showing a stacked state of a first weldment and a second weldment in the related art;

FIG. 2 is a view in the direction A of FIG. 1;

fig. 3 is a schematic diagram of a stacked state of a first weldment and a second weldment according to an embodiment of the present application;

FIG. 4 is a view in the direction B of FIG. 3, not showing the intersection of two adjacent edges;

FIG. 5 is a view from direction B of FIG. 3, showing the intersection of two adjacent edges, with the dashed line being an extension of the edge of the polygon;

FIG. 6 is a flow chart of a welding method according to an embodiment of the present application;

FIG. 7 is a flow chart of a welding method according to another embodiment of the present application;

fig. 8 is a flow chart of a welding method according to yet another embodiment of the present application.

Reference numerals illustrate: a first weldment 100; a main weldment 101; a first projection region 111; an insert 102; a second projection area 112; a second weldment 200; welding position 1; a first welding position 2; a second welding position 3; a third welding position 4; a fourth welding position 5; an intersection point S; a first distance D1; a second distance D2.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and technical features in the embodiments may be combined with each other, and the detailed description in the specific embodiments should be interpreted as an explanation of the gist of the present application and should not be construed as undue limitation to the present application.

As part of the inventive concept of the present application, before describing the embodiments of the present application, the reasons for the insufficient welding strength in the related art should be analyzed, and the technical solutions of the embodiments of the present application are obtained through reasonable analysis.

In the related art, the first weldment 100 and the second weldment 200 are welded, the projection is projected along the arrangement direction of the first weldment 100 and the second weldment 200, the projection area surrounded by the outer contour line of the projection area of the first weldment 100 and the outer contour line of the projection area of the second weldment 200 is a welding area, the outer contour line of the welding area is polygonal, and a plurality of welding positions for welding the first weldment 100 and the second weldment 200 are arranged along the circumferential direction of the polygon. The welding positions corresponding to the intersection points of the two adjacent side lines of the polygon are first welding positions 2, the first welding positions 2 are in one-to-one correspondence with the intersection points of the two adjacent side lines of the polygon, the distance between the intersection points of the two adjacent side lines of the polygon and the corresponding first welding positions 2 is a first distance, the distance between the intersection points of the two adjacent side lines of the polygon and other welding positions 1 except the corresponding first welding positions 2 in all the welding positions is a second distance, and the second distance is larger than the first distance, that is to say, the distance between the intersection points of the two adjacent side lines of the polygon and the corresponding first welding positions 2 is closer than the other welding positions 1, and the first welding positions 2 are closer to the intersection points. In the welding process of the first weldment 100 and the second weldment 200, the first weldment 100 and the second weldment 200 may not be welded at the first welding position 2 corresponding to the intersection point of the two adjacent side lines of the polygon, the first weldment 100 and the second weldment 200 are welded at the other welding positions 1, so that the first weldment 100 and the second weldment 200 are heated unevenly along the welding area circumference of the polygon, the first weldment 100 generates stress displacement relative to the second weldment 200, and the cold welding or even the blank welding between the first weldment 100 and the second weldment 200 is caused at part of welding positions, thereby reducing the welding strength between the first weldment 100 and the second weldment 200.

For example, referring to fig. 1 and 2, there are illustrated 9 welding positions for welding the first weldment 100 and the second weldment 200, wherein 4 welding positions are first welding positions 2, and other welding positions 1 are located between two adjacent first welding positions 2 in the circumferential direction. The first weldment 100 and the second weldment 200 are welded at each welding position in turn counterclockwise in the circumferential direction of the polygonal welding area with the first welding position 2 at the upper left corner shown in the drawing as the starting welding position. Illustratively, referring to FIG. 2, first weldment 100 and second weldment 200 are welded sequentially at each of the welding locations in the direction indicated by the arrows. In the process of welding the first weldment 100 and the second weldment 200 at each welding position in the circumferential direction of the polygonal welding area in turn, before the first weldment 100 and the second weldment 200 are welded at the first welding position 2 at the lower left corner in the drawing, the first weldment 100 and the second weldment 200 have been welded at the welding position 1 between the first welding position 2 at the upper left corner and the first welding position 2 at the lower left corner in the circumferential direction, before the first weldment 100 and the second weldment 200 are welded at the first welding position 2 at the lower right corner in the drawing, the first weldment 100 and the second weldment 200 have been welded at the welding position 1 between the first welding position 2 located circumferentially at the lower left corner and the first welding position 2 located circumferentially at the lower right corner, that is, the other welding positions 1 outside the first welding position 2 are welded before the welding of the first weldment 100 and the second weldment 200 is completed at all the first welding positions 2, resulting in uneven heating of the first weldment 100 and the second weldment 200 circumferentially along the welding area of the polygon, the first weldment 100 is displaced with respect to the second weldment 200, and the cold welding or even the blank welding between the first weldment 100 and the second weldment 200 is caused at part of the welding positions, thereby reducing the welding strength between the first weldment 100 and the second weldment 200.

It will be appreciated that the cases of cold and open welding are evident in laser welding. Some laser welding does not apply a welding material, but directly welds two base materials to be welded together by laser energy, for example, the first welding member 100 and the second welding member 200 are welded together after being partially melted by the laser energy without the welding material being filled between the first welding member 100 and the second welding member 200, in which case, once a large stress displacement occurs between the first welding member 100 and the second welding member 200, the first welding member 100 and the second welding member 200 cannot be well attached, and the first welding member 100 and the second welding member 200 form blank welding and dummy welding, which will have a large influence on welding strength, so that the welding strength between the first welding member 100 and the second welding member 200 is insufficient.

It will be appreciated that, instead of the laser welding, other ways of filling solder between the first weldment 100 and the second weldment 200 to perform welding are required, and before the welding of the first weldment 100 and the second weldment 200 is completed at all the first welding positions 2, the welding of the first weldment 100 and the second weldment 200 is performed at the welding positions 1 other than the first welding positions 2, and there is a possibility that blank welding and blank welding occur due to stress displacement caused by uneven heating along the circumferential direction of the welding area.

It should be noted that, the cold joint may be understood that the two parts to be welded are not completely bonded at the positions where the two parts should be bonded and welded due to stress displacement and other reasons, and are not sufficiently welded firmly. Blank welding is understood to be a more severe condition than dummy welding, possibly due to the greater displacement of the stress accumulated by the weld, and the two parts for welding are almost separated from each other at the position where they should be bonded to each other without forming a weld.

In view of this, the present embodiment provides a welding method for welding the first weldment 100 and the second weldment 200.

In one embodiment, the first weldment 100 and the second weldment 200 are integral parts of a valve plate.

In one embodiment, the arrangement direction of the first weldment 100 and the second weldment 200 is a predetermined direction.

In one embodiment, referring to fig. 3, the predetermined direction is the direction indicated by the arrow R1 in the figure.

In an embodiment, referring to fig. 3 to 5, projection is performed along a preset direction, a projection area defined by an outer contour line of a projection area of the first weldment 100 and an outer contour line of a projection area of the second weldment 200 is a welding area, and the outer contour line of the welding area is polygonal.

It should be noted that, the polygon according to the embodiment of the present application includes not only the case that two adjacent side lines in the side lines of the polygon directly intersect, but also the case that two adjacent side lines are rounded through arc transition. The shape of the corresponding outer contour line cannot be excluded from the polygon because of the rounded arc transition between two adjacent side lines.

In an embodiment, referring to fig. 4 and fig. 5, the outer contour of the projection area of the first weldment 100 is located within the outer contour of the projection area of the second weldment 200, and the welding area is an area surrounded by the outer contour of the projection area of the first weldment 100.

It should be noted that, the outer contour of the projection area of the first weldment 100 is located within the outer contour of the projection area of the second weldment 200, including various situations. In one case, the outer contour of the projection area of the first weldment 100 is located within the outer contour of the projection area of the second weldment 200, which can be understood as the outer contour of the projection area of the first weldment 100 and the outer contour of the projection area of the second weldment 200 overlap. In one case, the outer contour of the projection area of the first weldment 100 is located within the outer contour of the projection area of the second weldment 200, which is understood to mean that the outer contour of the projection area of the first weldment 100 and the outer contour of the projection area of the second weldment 200 partially overlap, and the outer contour of the projection area of the first weldment 100, which does not overlap with the outer contour of the projection area of the second weldment 200, is located within an area enclosed within the outer contour of the projection area of the second weldment 200. In one case, the outer contour line of the projection area of the first weldment 100 and the outer contour line of the projection area of the second weldment 200 do not overlap, and the outer contour line of the projection area of the first weldment 100 is entirely located within the area surrounded by the outer contour line of the projection area of the second weldment 200.

In one embodiment, referring to fig. 3 to 5, the shape of the first weldment 100 and the shape of the second weldment 200 are both plate-shaped.

It is to be understood that the shapes of the first weldment 100 and the second weldment 200 are not limited to a plate shape, and may be configured in other shapes according to actual needs.

In one embodiment, referring to fig. 3, the thickness of the first weldment 100 is smaller than the thickness of the second weldment 200.

In one embodiment, the welding method includes: determining a plurality of welding positions for welding the first weldment 100 and the second weldment 200, wherein at least three welding positions are first welding positions 2, the first welding positions 2 are in one-to-one correspondence with the intersection points S of two adjacent side lines of the polygon, the distance between the intersection points S of the two adjacent side lines of the polygon and the corresponding first welding positions 2 is a first distance D1, and the distance between the intersection points S of the two adjacent side lines of the polygon and other welding positions except the corresponding first welding positions 2 in all the welding positions is a second distance D2, wherein the second distance D2 is larger than the first distance D1. Thus, the welding position is determined, and the first welding position 2 can be determined based on the distance between the welding position and the intersection point S of two adjacent edges of the polygon. The first welding position 2 is closer to the intersection point S of the two adjacent edges of the polygon than the other welding positions.

The intersection point S of two adjacent edges of the polygon may be the intersection point S formed by directly intersecting the two adjacent edges, or may be the intersection point S formed by intersecting extension lines of the two adjacent edges.

In one embodiment, referring to fig. 4 to 6, the welding method further includes:

step S101: and (3) positioning welding: welding the first weldment 100 and the second weldment 200 at the first welding location 2;

step S102: after the tack welding, the first weldment 100 and the second weldment 200 are welded at the other welding positions except the first welding position 2 among all the welding positions.

In this way, the welding method of the embodiment of the present application completes the welding of the first weldment 100 and the second weldment 200 at all the first welding positions 2, because the intersection point S of every two adjacent side lines of the polygon corresponds to the first welding positions 2 one by one, the first weldment 100 and the second weldment 200 are welded near the intersection point S of every two adjacent side lines of the polygon, and then the welding of the first weldment 100 and the second weldment 200 at other welding positions is completed, so that the heating of the first weldment 100 and the second weldment 200 along the circumferential direction of the welding area is relatively uniform, the stress displacement of the first weldment 100 relative to the second weldment 200 is relatively small, and because the first weldment 100 and the second weldment 200 are welded at the first welding positions 2 near the intersection point S of every two adjacent side lines of the polygon, the first welding positions 100 and the second weldment 200 are welded at other welding positions outside the first welding positions 2, the welding of the first welding positions where the welding is completed can be restrained from being performed on the first weldment 100 and the second weldment 200, the stress displacement of the first weldment 100 and the second weldment 200 relative to the first weldment 100 and the second weldment 200 can be reduced, and the null welding of the first weldment 200 can be reduced, and the null welding displacement of the first weldment and the first weldment 200 can be reduced.

In one embodiment, the first weldment 100 and the second weldment 200 are welded by laser.

It will be appreciated that there are a variety of ways in which laser welding may be performed. In one embodiment, a portion of the laser welding is performed with a welding material, and the first weldment 100 and the second weldment 200 are welded together using the welding material. In another embodiment, part of the laser welding is performed without welding materials, and the first weldment 100 and the second weldment 200 are welded by partially melting the first weldment 100 and the second weldment 200 by laser, so as to achieve the purpose of welding the first weldment 100 and the second weldment 200.

It is understood that the first weldment 100 may have a through hole or a notch or the second weldment 200 may have a through hole or a notch. In an embodiment, referring to fig. 4 and 5, the welding position is located in a region where the projection region of the first weldment 100 and the projection region of the second weldment 200 overlap, and projected along the predetermined direction. As such, the welding positions avoid both the positions of the through holes or the slits on the first weldment 100 and the positions of the through holes or the slits on the second weldment 200, so that the welding gun can partially melt-weld the first weldment 100 and the second weldment 200 by the laser from the side of the first weldment 100 facing away from the second weldment 200 at each welding position, or so that the welding gun can partially melt-weld the first weldment 100 and the second weldment 200 by the laser from the side of the second weldment 200 facing away from the first weldment 100 at each welding position.

In one embodiment, the welding between the first weldment 100 and the second weldment 200 is spot welding.

In one embodiment, the first weldment 100 and the second weldment 200 are spot welded at each welding location by a laser.

In an embodiment, when the first weldment 100 and the second weldment 200 are partially melted by the laser to weld the first weldment 100 and the second weldment 200, a laser welding gun may be disposed at a side of the first weldment 100 facing away from the second weldment 200 to weld the first weldment 100 and the second weldment 200 together, and laser energy can be transmitted through the first weldment 100 having a certain thickness.

In an embodiment, when the first weldment 100 and the second weldment 200 are partially melted by the laser to weld the first weldment 100 and the second weldment 200, a laser welding gun may be disposed at a side of the second weldment 200 facing away from the first weldment 100 to weld the first weldment 100 and the second weldment 200, and laser energy can be transmitted through the second weldment 200 having a certain thickness to weld the first weldment 100 and the second weldment 200 together.

In an embodiment, when the thickness of the first weldment 100 along the arrangement direction of the first weldment 100 and the second weldment 200 is smaller than the thickness of the second weldment 200 along the arrangement direction of the first weldment 100 and the second weldment 200, the first weldment 100 and the second weldment 200 are partially melted by laser to weld the first weldment 100 and the second weldment 200, and a laser welding gun can be arranged on the side of the first weldment 100 away from the first weldment 100 so that laser energy can better penetrate through the first weldment 100 to weld the first weldment 100 and the second weldment 200 together.

In one embodiment, referring to fig. 4, 5 and 7, welding the first weldment 100 and the second weldment 200 at the first welding position 2 includes:

step S201: the first weldment 100 and the second weldment 200 are welded at each first welding position 2 in turn along the circumferential direction.

In this way, the moving track of the welding gun is smoother, and the moving track of the welding gun between the two first welding positions 2 is less likely to cross each other.

In one embodiment, referring to fig. 4 and 5, the first welding position 2 at the upper left corner is taken as a starting welding position, and the first welding member 100 and the second welding member 200 are welded at each first welding position 2 in a counterclockwise direction in sequence.

In one embodiment, referring to fig. 4, 5 and 8, the outer contour of the welding area is polygonal, the polygonal is quadrangular, and welding the first weldment 100 and the second weldment 200 at the first welding position 2 includes:

step S202: welding the first weldment 100 and the second weldment 200 at two first welding positions 2 corresponding to one diagonal line of the quadrangle;

step S203: the first weldment 100 and the second weldment 200 are welded at two first welding positions 2 corresponding to the other diagonal of the quadrangle.

In this way, with reference to the diagonal lines of the quadrangles as a sequential reference, in the process of welding the first weldment 100 and the second weldment 200 at each first welding position 2, the first weldment 100 and the second weldment 200 are heated uniformly along the circumferential direction of the welding area, which is favorable for reducing the stress displacement of the first weldment 100 relative to the second weldment 200 and improving the welding strength between the first weldment 100 and the second weldment 200.

In an embodiment, referring to fig. 4 and 5, the first weldment 100 includes a main weldment 101 and an insert 102, the main weldment 101 has a receiving hole, the insert 102 is located in the receiving hole, a projection area formed by projecting the main weldment 101 along a preset direction is a first projection area 111, a projection area formed by projecting the insert 102 along the preset direction is a second projection area 112, and the first welding position 2 is located in the first projection area 111 so that the main weldment 101 and the second weldment 200 are welded at the first welding position 2, at least one welding position is a second welding position 3, and the second welding position 3 is located in the second projection area 112.

In one embodiment, referring to fig. 4, 5, 7 and 8, welding the first weldment 100 and the second weldment 200 at other welding positions than the first welding position 2 among all the welding positions includes:

step S204: the insert 102 and the second weldment 200 are welded at the second welding location 3.

In this way, after the welding of the main weldment 101 and the second weldment 200 is completed at each first welding position 2, the insert 102 and the second weldment 200 are welded at the second welding position 3 to achieve the fixation between the insert 102 and the second weldment 200. The stress displacement between the insert 102 and the second weldment 200 is reduced, and the welding strength of the insert 102 and the second weldment 200 is improved.

In an embodiment, referring to fig. 4 and fig. 5, the welding area is an area surrounded by an outer contour line of a projection area of the first weldment 100, and the area surrounded by the outer contour line of the projection area of the first weldment 100 is an area surrounded by an outer contour line of a projection area of the main weldment 101. That is, the welding area is an area surrounded by an outer contour line of the first projection area 111.

In one embodiment, referring to fig. 4 and 5, welding the first weldment 100 and the second weldment 200 at the first welding position 2 includes: the first weldment 100 and the second weldment 200 are welded at each first welding position 2 in turn along the circumferential direction. One of the first welding positions 2 is a starting welding position. When the number of second welding positions 3 is two, welding the insert 102 and the second weldment 200 at the second welding positions 3 includes: the insert 102 is welded to the second weldment 200 at a second welding position 3 near the initial welding position, and after the welding of the insert 102 to the second weldment 200 is completed at the second welding position 3 near the initial welding position, the insert 102 is welded to the second weldment 200 at the remaining one second welding position 3.

In an embodiment, referring to fig. 4 and 5, at least one of the welding positions in the first projection area 111 is a third welding position 4, a region between every two adjacent first welding positions 2 in the circumferential direction is a spacer, and the third welding position 4 is disposed in at least one of the spacers.

In one embodiment, referring to fig. 4, 5, 7 and 8, after the insert 102 and the second weldment 200 are welded at the second welding position 3, the first weldment 100 and the second weldment 200 are welded at other welding positions than the first welding position 2 among all the welding positions, further comprising:

step S205: the main weldment 101 and the second weldment 200 are welded at the third welding position 4.

In this way, after the welding between the insert 102 and the second weldment 200 is completed at the second welding position 3, the main weldment 101 is welded to the second weldment 200 at the third welding position 4, and the main weldment 101 and the second weldment 200 are further welded firmly. The insert 102 and the second weldment 200 are welded at the second welding position 3, and then the main weldment 101 and the second weldment 200 are further welded firmly at the third welding position 4, so that the stress displacement between the insert 102 and the second weldment 200 is reduced, and the welding strength of the insert 102 and the second weldment 200 is improved. The stress displacement caused by welding the main weldment 101 and the second weldment 200 at the third welding position 4 is limited by the main weldment 101 and the second weldment 200 which are welded at the first welding position 2, so that the stress displacement caused by welding the main weldment 101 and the second weldment 200 at the third welding position 4 is smaller, and the welding strength of the main weldment 101 and the second weldment 200 is improved.

In one embodiment, referring to fig. 4 and 5, welding the first weldment 100 and the second weldment 200 at the first welding position 2 includes: the first weldment 100 and the second weldment 200 are welded at each first welding position 2 in turn along the circumferential direction. One of the first welding positions 2 is a starting welding position. The number of third welding positions 4 is two, and two second welding positions 3 are circumferentially located between the two third welding positions 4, and the main weldment 101 and the second weldment 200 are welded at the third welding positions 4, including: the main weldment 101 and the second weldment 200 are welded at a third welding position 4 near the initial welding position, and after the welding of the main weldment 101 and the second weldment 200 is completed at the third welding position 4 near the initial welding position, the main weldment 101 and the second weldment 200 are welded at the remaining one third welding position 4.

In an embodiment, referring to fig. 4 and 5, at least one of the welding positions located in the second projection area 112 is a fourth welding position 5, and the fourth welding position 5 is located between two circumferentially adjacent second welding positions 3.

In one embodiment, referring to fig. 4, 5, 7 and 8, after the welding of the main weldment 101 and the second weldment 200 at the third welding position 4, the welding of the first weldment 100 and the second weldment 200 at other welding positions than the first welding position 2 among all the welding positions further includes:

step S206: the insert 102 and the second weldment 200 are welded at the fourth welding location 5.

In this way, the main weldment 101 and the second weldment 200 are further welded firmly at the third welding position 4, the stress displacement of the main weldment 101 relative to the second weldment 200 at the edge of the accommodating hole can be restrained, after the welding of the main weldment 101 and the second weldment 200 is completed at the third welding position 4, the further welding of the insert 102 and the second weldment 200 at the fourth welding position 5 is firm, the stress displacement of the main weldment 101 relative to the second weldment 200 possibly caused in the process of welding the insert 102 and the second weldment 200 at the fourth welding position 5 is reduced, the stress displacement of the insert 102 relative to the second weldment 200 generated by welding the insert 102 and the second weldment 200 at the fourth welding position 5 is limited by the stress displacement of the insert 102 and the second weldment 200 which are welded at the second welding position 3, so that the stress displacement of the insert 102 and the second weldment 200 relative to the second weldment 200 generated in the welding process of the insert 102 and the second weldment 200 at the fourth welding position 5 is smaller, and the strength of the first weldment 100 and the insert 102 are improved.

In one embodiment, referring to fig. 4 and 5, the insert 102 has a wide end and a narrow end, the width of the wide end is greater than the width of the narrow end, and the second welding position 3 and the fourth welding position 5 are located at the wide end. In this way, the second welding position 3 and the fourth welding position 5 are located at the wide end, so that the second welding position 3 and the fourth welding position 5 are distributed in a larger range along the circumferential direction of the welding area, and the second welding position 3 and the fourth welding position 5 are distributed more dispersedly, so that the insert 102 and the second weldment 200 are heated more uniformly.

In an embodiment, the narrow end may not be welded to the second weldment 200, and the narrow end may be driven by an external force to contact or separate from the second weldment 200, so as to function like a spring sheet.

In an embodiment, at least a preset number of spacers is a target spacer, and the second welding position 3 and the third welding position 4 are alternatively set in the target spacer, where the preset number is a difference between the total number of spacers and 1. In this way, since at least the preset number of spacers is the target spacers, the preset number is the difference between the total number of the spacers and 1, the preset number of target spacers can be distributed uniformly along the circumferential direction of the welding area, after the main weldment 101 and the second weldment 200 are welded at the first welding position 2, the insert 102 and the second weldment 200 are welded at the second welding position 3 in the target spacers, and the main weldment 101 and the second weldment 200 are welded at the third welding position 4 in the target spacers, so that in the welding process at the second welding position 3 and the third welding position 4, the main weldment 101, the insert 102 and the second weldment 200 are heated uniformly along the circumferential direction of the welding area, thereby being beneficial to improving the welding strength between the main weldment 101 and the second weldment 200 and the welding strength between the insert 102 and the second weldment 200.

In an embodiment, referring to fig. 4 and 5, the outer contour of the welding area is quadrilateral, and the distribution of each welding position along the circumferential counterclockwise direction of the welding area is sequentially a first welding position 2, a third welding position 4, a first welding position 2, a second welding position 3, a fourth welding position 5, a second welding position 3, a first welding position 2, a third welding position 4 and a first welding position 2 by taking one of the first welding positions 2 as a reference. The second welding location 3 and the fourth welding location 5 are both located at the wide end of the insert 102. When the wide and narrow ends of the insert 102 are arranged in the up-down direction with the narrow end facing downward and the wide end facing downward, a person faces the first weldment 100 in the direction in which the first weldment 100 points toward the second weldment 200, with one third welding location 4 on the left side of the insert 102 and another third welding location 4 on the right side of the insert 102. The first welding position 2 near the narrow end of the insert 102 and located at the left side of the insert 102 is used as a starting welding position, the insert 102 and the second welding member 200 are welded at each first welding position 2 in turn along the circumferential anticlockwise direction of the welding zone, after the main welding member 101 and the second welding member 200 are welded at each first welding position 2, the insert 102 and the second welding member 200 are welded at the second welding position 3 located at the left side of the insert 102, after the insert 102 and the second welding member 200 are welded at the second welding position 3 located at the left side of the insert 102, the insert 102 and the second welding member 200 are welded at the second welding position 3 located at the right side of the insert 102, after the main welding member 101 and the second welding member 200 are welded at the third welding position 4 located at the left side of the insert 102, the main welding member 101 and the second welding member 200 are welded at the third welding position 4 located at the right side of the insert 102, and the second welding member 101 and the second welding member 200 are welded at the third welding position 4 located at the right side of the insert 102, and after the main welding member 101 and the second welding member 200 are welded at the third welding position 4 located at the right side of the insert 102. The welding method ensures that the first weldment 100 and the second weldment 200 are heated uniformly along the circumferential direction of a welding area, the stress displacement of the first weldment 100 relative to the second weldment 200 is smaller, and the welding strength of the first weldment 100 and the first weldment 100 is improved.

The various embodiments/implementations provided herein may be combined with one another without conflict.

The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. The welding method is characterized by being used for carrying out spot welding on a first welding piece and a second welding piece, wherein the arrangement direction of the first welding piece and the second welding piece is a preset direction, projection is carried out along the preset direction, a projection area formed by surrounding an outer contour line of a projection area of the first welding piece and an outer contour line of a projection area of the second welding piece is a welding area, and the outer contour line of the welding area is polygonal, and the welding method comprises the following steps:

after the tack welding, welding the first weldment and the second weldment at other welding positions than the first welding position among all the welding positions;

the first welding piece comprises a main welding piece and an insert, the main welding piece is provided with a containing hole, the insert is located in the containing hole, a projection area formed by projecting the main welding piece along a preset direction is a first projection area, a projection area formed by projecting the insert along the preset direction is a second projection area, a first welding position is located in the first projection area so that the main welding piece and a second welding piece are welded at the first welding position, at least one welding position is a second welding position, and the second welding position is located in the second projection area; welding the first weldment and the second weldment at other welding positions than the first welding position among all the welding positions, including: welding the insert and the second weldment at the second welding location;

at least one welding position in the first projection area is a third welding position, a region between every two adjacent first welding positions along the circumferential direction is a spacing area, and the third welding position is arranged in at least one spacing area; after welding the insert and the second weldment at the second welding location, welding the first weldment and the second weldment at other welding locations of all the welding locations than the first welding location, further comprising: and welding the main welding piece and the second welding piece at the third welding position.

2. The welding method of claim 1, wherein welding the first weldment and the second weldment at the first welding location comprises: and welding the first welding piece and the second welding piece at each first welding position in sequence along the circumferential direction.

3. The welding method according to claim 1, wherein the polygon is a quadrangle, welding the first weldment and the second weldment at the first welding position, comprising:

4. The welding method of claim 1, wherein at least one of the welding locations located within the second projection area is a fourth welding location located between circumferentially adjacent two second welding locations; after welding the main weldment and the second weldment at the third welding location, welding the first weldment and the second weldment at other welding locations of all the welding locations than the first welding location, further comprising: and welding the insert and the second weldment at the fourth welding position.

5. The method of welding according to claim 4, wherein the insert has a wide end and a narrow end, the wide end having a width greater than a width of the narrow end, the second welding location and the fourth welding location being located at the wide end.

6. The welding method of claim 1, wherein at least a predetermined number of spacers are target spacers, the second welding location and the third welding location being alternatively disposed within the target spacers, the predetermined number being a difference between a total number of the spacers and 1.

7. The welding method according to any one of claims 1 to 6, wherein the first weldment and the second weldment are partially melted by laser to weld the first weldment and the second weldment, and the welding position is located in a region where the projection region of the first weldment and the projection region of the second weldment overlap, and the projection is along the preset direction.

8. The welding method according to any one of claims 1 to 6, wherein the first weldment and the second weldment are both plate-shaped in shape; and/or projecting along the preset direction, wherein the outer contour line of the projection area of the first welding piece is positioned in the outer contour line of the projection area of the second welding piece, and the welding area is an area surrounded by the outer contour line of the projection area of the first welding piece.