JP2013237052A - Welding method by non-contact welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welding method by non-contact welding that enables highly accurate welding free from welding failure and shortage of welding strength by improving adhesion by eliminating a clearance between welded members and that can easily recognize an accurate irradiation position of a laser beam and an electron beam.SOLUTION: At an end of a first metal plate 10, a plurality of projections 14 vertically projecting from the end are formed at predetermined intervals. On a second metal plate 12, a plurality of through holes 26 to which the projections 14 are fitted are formed at predetermined intervals. The projection 14 of the first metal plate 10 is inserted and fitted to the through hole 26 of the second metal plate 12, and a projection end face 18 of the projection 14 has a height equal to or close to that of one surface 12a of the second metal plate 12. A welding index line 30 which is a fitting section between the projection 14 and the through hole 26 appears on the surface 12a of the second metal plate 12. A laser beam L is emitted from the surface 12a side of the second metal plate 12 along the welding index line 30, so as to perform welding.

Description

  The present invention relates to a welding method for welding a plurality of members to be welded such as metal plates by non-contact welding such as laser welding or electron beam welding.

  In sheet metal processing using various metal plates such as galvanized steel sheets, aluminum, brass, copper, cold rolled steel sheets, mild steel, tinplate, chromium, nickel, titanium, etc., it is commercialized by fixing multiple members. There are many things. As a fixing method in such sheet metal processing, fixing by “caulking” has been generally used from the past. However, in the case of fixing by “caulking”, there is an inconvenience that the fixing portion is detached due to vibration or secular change. For this reason, recently, welding methods using non-contact welding such as laser welding and electron beam welding have been frequently used.

  For example, in laser welding using a laser beam as a heat source, a plurality of members to be welded such as metal plates are joined at arbitrary positions, and the joining position is irradiated with a laser beam to heat and melt the joining position. Is cooled and solidified to weld the members to be welded together. In laser welding, a laser beam (a high-energy-density beam focused by a laser) is locally irradiated onto the welded member as a concentrated heat source, so that a very deep penetration can be obtained and the entire welded member can be obtained. There is an advantage that the influence of heat is very small, and the member to be welded is hardly deformed. In addition, there is a technique for achieving more stable welding by forming a tab-shaped portion (Patent Document 1) and a slit (Patent Document 2), which are dedicated portions for welding, at or near the laser beam irradiation site in the member to be welded. It has been published.

JP 10-334957 A Japanese Patent Application Laid-Open No. 10-99982

Here, two typical specifications of conventional laser welding are illustrated in FIG. The first example is shown in FIG. 9 (a), and the second example is shown in FIG. 9 (b).
FIG. 9 (a) joins the end of the plate-like first welded member 110 (the end face of the thick portion) to an arbitrary position on one side of the plate-like second welded member 112, and welds the joined portion. Is. That is, two plate-like members are welded at a right angle. In this case, the laser beam is irradiated from above the second welded member 112 (the surface of the second welded member 112 opposite to the surface to which the first welded member 110 is joined). Through the irradiation of the laser beam, the entire thickness of the second welded member 112 where the end of the first welded member 110 is joined, and the shallow depth inside from the end position of the first welded member 110. Up to the position is melted. Thereafter, the melted portion is cooled and solidified (becomes the welded portion 114), whereby the first welded member 110 and the second welded member 112 are fixed.
FIG. 9B shows a first welded member 110 that is welded and fixed to one surface of the second welded member 112. The first welded member 110 is bent in the vicinity of the end portion by 90 degrees with respect to the main part, and is a tab-shaped portion dedicated to welding. What formed the part 110a is used. The outer side surface of the tab-shaped portion 110a of the first welded member 110 is joined to one surface of the second welded member 112, and the second welded member 112 is positioned above the second welded member 112 at an arbitrary position on the joined surface. 112 is irradiated with a laser beam from a surface opposite to the surface joined to the tab-shaped portion 110a of the first welded member 110 in 112). By irradiation with the laser beam, the entire thickness of the second welded member 112 and the entire thickness of the tab-like portion 110a of the first welded member 110 or up to a part of the thickness are melted. Thereafter, the melted portion is cooled and solidified (becomes a welded portion 114), whereby the first welded member 110 (tab-shaped portion 110a) and the second welded member 112 are fixed.

However, as shown in FIG. 9 (b), conventional laser welding (a place where the tab-like portion 110a of the first welded member 110 and the second welded member 112 are joined) joined to the two surfaces is performed. In the spot welding method, the area of the joint portion between the tab-like portion 110a of the first member to be welded 110 and the second member to be welded 112 is significantly larger than that of the welded portion 114. May cause bad conditions. If the adhesion is poor, a steel plate load is applied to the welded part, and there is a concern of poor welding or insufficient welding strength. If the adhesion is poor, the two members may be fixed at an angle slightly deviated from the desired position, and the product shape may be slightly deformed.
Further, in the conventional laser welding method shown in FIGS. 9A and 9B, the joining location of the first welded member 110 and the second welded member 112 is the second welded member 112 from the laser irradiation side. It becomes the blind spot position behind. For this reason, it is difficult to accurately recognize the joint portion between the first member to be welded 110 and the second member to be welded 112, and there is also a problem that it is difficult to aim when irradiating a laser beam.

  The present invention has been made in view of the problems as described above, and improves the adhesion of the welded parts between the members to be welded, thereby eliminating the fear of poor welding and insufficient welding strength. It is an object of the present invention to provide a welding method by non-contact welding that can increase the welding strength by making the area wide and easily grasp the exact irradiation position of the laser beam or electron beam.

In order to solve the above-mentioned problem, a welding method by non-contact welding according to the invention of claim 1 is:
A welding method by non-contact welding for welding a first welded member and a second welded member, wherein a projection is formed on the first welded member, and the first welded member is formed on the second welded member. A through hole for fitting with the protruding portion of the welding member is formed, and the protruding portion of the first welded member is inserted and fitted into the through hole of the second welded member. A fitting position with the through hole is exposed on the surface side of the second welded member opposite to the position where the first welded member is present, and a laser beam or an electron beam is irradiated on or near the fitting position. The first welded member and the second welded member positioned at the irradiation location are welded.
Further, in the welding method by non-contact welding according to the second aspect of the present invention, when the protruding portion of the first welded member is inserted and fitted into the through hole of the second welded member, the protruding portion The protrusion end surface of the second welded member is arranged at the same height as or close to the surface of the second welded member opposite to the insertion side of the first welded member.
According to a third aspect of the present invention, there is provided a welding method by non-contact welding in which the first welded member in the second welded member is along the fitting position between the outer surface of the projection and the inner wall of the through hole. A laser beam or an electron beam is irradiated from the surface opposite to the member.
A welding method by non-contact welding according to a fourth aspect of the invention is characterized in that the height of the protrusion is the same as the plate thickness of the second member to be welded.
A welding method by non-contact welding according to a fifth aspect of the invention is characterized in that the side surface of the protruding portion is tapered.
In the welding method by non-contact welding according to the sixth aspect of the present invention, a plurality of the projections of the first member to be welded and the through holes of the second member to be welded are provided at the same predetermined interval. It is characterized by being formed.

According to the welding method of the present invention, since the projection formed on the first welded member is welded in a close contact state fitted to the through hole formed on the second welded member, The gap is eliminated, and the positions of the first and second members to be welded are fixed at the time of welding, and both can be welded without any angular deviation. As a result, there is no risk of deformation in the product shape, and no alternating load is subsequently applied to the welded location.
In addition, since the first welded member and the second welded member are in a fitted state, they are stable without being restrained and fixed, so that a laser beam and an electron beam can be accurately irradiated, and no jig is required. Become.
Further, a welding operation instruction line (a first welded member projection and a through-hole of the second welded member) as a mark to be welded to the surface of the second welded member irradiated with a laser beam or an electron beam. When the laser beam is irradiated, even if the first welded member is at the blind spot position on the back surface of the second welded member, the welding operation instruction line that is the irradiation position is used as a mark. If it can be clearly and easily grasped and a welding worker welds along the welding operation instruction line, welding can be reliably performed at an accurate position.

The joint location between the projection of the first welded member and the second welded member is the outer periphery of the side surface of the projection of the first welded member and the inner wall of the through hole of the second welded member. It is wider than the one (FIG. 9). If a laser beam or an electron beam is irradiated along the welding operation instruction line, the joining portion of the two members is melted, so that there is no gap and the melting area is widened, so that the welding strength can be further increased.
In addition, if the height of the protrusion and the thickness of the second welded member are made equal, the end of the protrusion becomes the same surface as the surface of the second welded member after welding, and there is no disturbing bulge or bulge. In addition to improving the versatility, the appearance of the weld mark is also improved.
Also, if the side surface of the protrusion is tapered, it will be easier to fit into the through hole. If multiple protrusions and corresponding through holes are formed, the welding strength will be further improved. Can do.

It is a perspective view which shows the 1st to-be-welded member and the 2nd to-be-welded member before welding. It is sectional drawing which shows the state which fitted the 1st to-be-welded member and the 2nd to-be-welded member from the state which the 1st to-be-welded member and the 2nd to-be-welded member shown in FIG. 1 isolate | separate. It is a perspective view which shows the state which welds from the state which the 1st to-be-welded member and the 2nd to-be-welded member fitted. It is a schematic conceptual diagram which shows the welding method by the non-contact welding which concerns on a present Example. It is sectional drawing which shows the state which fitted the 1st to-be-welded member and the 2nd to-be-welded member from the state which the 1st to-be-welded member and the 2nd to-be-welded member in another form isolate | separate. (A) and (b) are the enlarged plan views of a welding trace. It is a perspective view which shows the 1st to-be-welded member and 2nd to-be-welded member in another form. It is a top view which shows the state which fitted the 1st to-be-welded member and 2nd to-be-welded member shown in FIG. (A) (b) is a schematic sectional drawing which shows the structure of the conventional laser welding.

Hereinafter, an embodiment of a welding method by non-contact welding according to the present invention will be described based on the drawings.
FIG. 1 is a perspective view showing a state in which a first welded member and a second welded member are separated before welding. 2 is a cross-sectional view showing a state in which the first welded member and the second welded member are fitted from the state in which the first welded member and the second welded member shown in FIG. 1 are separated. It is. FIG. 3 is a perspective view showing a state in which welding is performed from a state in which the first welded member and the second welded member are fitted.

  The welding method by non-contact welding in the present invention includes an end surface (thickness surface of the plate) side of the first metal plate 10 that is the first welded member and one surface of the second metal plate 12 that is the second welded member. And laser welding. In the present invention, prior to laser welding, the first metal plate 10 and the second metal plate 12 are pre-processed.

  As shown in FIG. 1 and FIG. 2, a plurality of protrusions 14 are formed at predetermined intervals in the end portion (thickness portion of the plate) of the first metal plate 10. A recessed space 16 is formed between them. The front end surface of the end portion of the first metal plate 10 facing the second metal plate 12 has a projecting end surface 18 at the front end of the projecting portion 14 and a recessed end surface facing the recessed space 16 between the projecting portion 14 and the projecting portion 14. 20 and. The height of the protrusion 14 is a height between the recessed end surface 20 and the protrusion end surface 18, and this height is “h”.

  The side surface that goes around the periphery of the protrusion 14 faces the recessed space 16 and has a pair of first protrusion side surfaces 22 having a relatively small area (the height “h” of the protrusion 14 is one side, A metal plate 10 having a thickness on the other side) and a pair of second projection side surfaces 24 (a height of the projection portion 14) having a relatively large area disposed in a direction perpendicular to the pair of first projection side surfaces 22. The length “h” is one side, and the length in the longitudinal direction of the protrusion 14 (the length along the front or back surface of the protrusion 14) is the other side. The first metal plate is pressed so as to form an outer shape in which the protruding end surface 18, one protruding side surface 22, the recessed end surface 20, and the other protruding side surface 22 are continuously formed. The metal plate 10 can be formed.

  In the second metal plate 12, a plurality of through holes 26 having a square cross section are formed in the same linear direction at predetermined intervals in the thickness direction. The inner wall 28 of the cross section of each through hole 26 of the second metal plate 12 is set to a shape in which each projection 14 of the first metal plate 10 is just fitted. That is, when the protrusion 14 of the first metal plate 10 is fitted into the through hole 26 of the second metal plate 12, the outer periphery of the side surface of the protrusion 14 and the inner wall 28 of the through hole 26 are joined without a gap. Set the dimensions and shape of each. Further, the plate thickness (depth of the through hole 26) “t” of the second metal plate 12 is the same dimension as the height “h” of the protrusion 14 of the first metal plate 10 on the assumption that there is no error. It is desirable to make it.

  When welding the first metal plate 10 and the second metal plate 12, the protrusion 14 of the first metal plate 10 is inserted and fitted into the through hole 26 of the second metal plate 12. By this insertion fitting, the recessed end surface 20 of the first metal plate 10 contacts the one surface 12b of the second metal plate 12, and the through hole of the second metal plate 12 of the protrusion 14 of the first metal plate 10 by the contact. The insertion movement to 26 stops. In the state where the insertion movement is stopped, the protruding portion 14 of the first metal plate 10 and the through hole 26 of the second metal plate 12 are fitted so as to be welded (FIGS. 2 and 3). In a state where the protrusion 14 of the first metal plate 10 and the through hole 26 of the second metal plate 12 are fitted, the side surfaces around the protrusion 14 of the first metal plate 10 (the pair of protrusion side surfaces 22 and the pair of protrusions). The side surface 24) is tightly bonded to the inner wall 28 of the through hole 26 without a gap.

  In a state where the projection 14 of the first metal plate 10 and the through hole 26 of the second metal plate 12 are fitted (FIGS. 2 and 3), the projection end surface 18 of the projection 14 is in the second welded member 12. It sets so that it may become the same or near height as the surface 12a on the opposite side to the insertion side of the 1st member 10 to be welded. One surface 12a of the second metal plate 12 (the position visible in FIG. 3, the surface opposite to the surface 12b of the second metal plate 12 with which the recessed end surface 20 of the first metal plate 10 abuts) is on the side. The protrusion end surface 18 of the protrusion 14 of the single metal plate 10 is exposed. That is, a square in which the through hole 26 of the second metal plate 12 and the protrusion 14 of the first metal plate 10 are fitted to the surface 12 side of the second metal plate 12 opposite to the position where the first metal plate 10 is present. A fitting position (welding index line 30) appears. This square welding index line 30 is an index for the welding operator to perform welding. The laser beam L is irradiated along the welding index line 30 around the welding index line 30 from the surface 12a side of the second metal plate 12 where the welding index line 30 appears. The width of the laser beam L is sufficiently wider than the thickness of the welding index line 30. When the first metal plate 10 and the second metal plate 12 are welded by irradiating the laser beam L, the laser beam L can be moved even if the first metal plate 10 and the second metal plate 12 are fixed and moved. Either the first metal plate 10 or the second metal plate 12 may be moved with the beam L fixed.

  Here, the specific example at the time of irradiating the laser beam L to FIG. 4 is shown as a schematic conceptual diagram. In a state where the first metal plate 10 and the second metal plate 20 to be welded are fitted, the fitting position (welding index line 30) is captured by the condenser lens group 52 of the remote welding optical device 50, The video is recognized as an image by the camera 58 through various mirrors 54 and galvanometer mirrors 56 (dashed line). Information recognized as an image is sent to the image recognition processing PC 60 and subjected to a welding shape recognition process, a position correction calculation process, and the like. The information subjected to the above processing is sent from the image recognition processing PC 60 to the laser oscillator (control system) 62 as an appropriate processing program and position correction data. The laser oscillator (control system) 62 oscillates the laser beam L from the laser oscillator 64 in accordance with those programs and data. The laser beam L oscillated by the laser oscillator 64 passes through various mirrors 54 and galvanometer mirrors 56 and is connected to the first metal plate 10 and the second metal plate 20 to be welded via the condenser lens group 52. (Welding index line 30) is irradiated. At this time, the galvanometer mirror 56 is controlled by the scanner device (control system) 66 in accordance with the position correction data transmitted from the laser oscillator (control system) 60 and changes the angle. In this way, by changing the angle of the galvanometer mirror 56, the irradiation position can be adjusted, and the laser beam L can be accurately irradiated along the welding index line 30.

  As described above, by irradiating the laser beam L to the welding index line 30 that appears at the fitting position between the first metal plate 10 and the second metal plate 12, the welding index line 30 on the first metal plate 10 side is reduced. The vicinity and the vicinity of the welding index line 30 side on the second metal plate 12 side are melted, and then the melting point on the first metal plate 10 side and the melting point on the second metal plate 12 side are integrated, and then the melting point Solidifies, the first metal plate 10 and the second metal plate 12 are fixed by welding.

  When the laser beam L is irradiated, the welding index line 30 is exposed on the surface 12a side of the second metal plate 12 to which the laser beam L is irradiated, so that the irradiation position (welding index line 30) to be welded is accurate. Therefore, the irradiation work is easy. Further, since the two members are in a fixed state in which the protruding portion 14 is fitted in the through hole 26 during welding, the two members do not need to be separately suppressed, and a jig for that purpose is also unnecessary.

  Further, if the height “h” of the protrusion 14 and the plate thickness “t” of the second metal plate 12 are the same dimension (assuming no error in the dimension of the member), the protrusion end surface 18 of the protrusion 14 and the The surface 12a of the two-metal plate 12 becomes the same surface (same height surface), and there is no disturbing protrusion or dent on the entire surface 12a when welding, and as a result, even if the surface 12a is touched by hand, the hand is scratched. It is possible to make the surface beautiful. In addition, although it is desirable that the protrusion end surface 18 of the protrusion 14 and the surface 12a of the second metal plate 12 are the same surface (the same height surface), the protrusion 14 to the through hole 26 of the second metal plate 12 The protruding length may be at least half the depth of the through hole 26. If it is less than that, there is a possibility that the fitted state is easily disengaged, and the bonding area, that is, the welding area between the side surface of the projection 14 and the wall surface 28 of the through hole 26 decreases.

  Further, as shown in FIG. 5, the shape of the protrusion 14 is a taper shape with a gradient on the protrusion side surface 22, and the width of the tip portion (projection end surface 18) of the protrusion 14 is narrower than the width of the base portion. It is good also as a shape. Thereby, the width “w1” of the tip portion (projection end surface 18) can be made smaller than the width “w2” of the through hole 26. With such a configuration, when the protrusion 14 of the first metal plate 10 is inserted and fitted into the through hole 26 of the second metal plate 12, it is easy to insert. At this time, the height “h” of the protrusion 14 is slightly higher than the thickness of the second metal plate 12 (depth “t” of the through hole 26), and the protrusion 14 of the first metal plate 10 is When fitted into the through hole 26 of the metal plate 12, it is preferable to set the dimensions so that the tip (projection end surface 18) of the protrusion 14 slightly protrudes. If it does so, when welding with a laser, a welding surface will rise a little, but the clearance gap produced by the taper is filled, and it can improve adhesiveness.

FIG. 6 is an enlarged plan view of the welding trace, and shows the welding traces 32 and 34 which are specific shapes of the welded portions.
The welding mark 32 shown in FIG. 6A is a case where the laser beam L is irradiated along the welding index line 30 in which the protrusion 14 of the first metal plate 10 and the through hole 26 of the second metal plate 12 are fitted. belongs to. Since the width of the laser beam L (the width of the region surrounded by the oblique lines in FIG. 6) is wider than the welding index line 30, if the laser beam L is irradiated along the welding index line 30 around the welding index line 30, The first metal plate 10 and the second metal plate 12 located on both sides of the welding index line 30 can be melted. In particular, when the thickness of the first metal plate 10 on which the protrusions 14 are formed is relatively thick (when the width of the protrusion end surface 18 of the protrusion 14 is wide), the welded shape is effective. In FIG. 6A, the number of welding marks 32 is two, for example, the laser beam L is moved twice.

On the other hand, the welding mark 34 shown in FIG. 6B passes linearly from the outside to the inside of the square welding index line 30 and protrudes to the outside of the welding index line 30, and then turns back and is welded again. This is a case where the laser beam L is irradiated in a zigzag shape so as to project in the shape of a straight line and project outside the welding index line 30 and then turn back and move. With the irradiation method of FIG. 6B, there is an advantage that the laser beam L can be irradiated with a single stroke, and the irradiation process only needs to be performed once per location. In particular, when priority is given to the degree of simplicity of irradiation (easy to aim) over welding strength, it is possible to cope with out-of-position by using the wave shape in this way.
In addition, when the plate | board thickness of the 1st metal plate 10 in which the projection part 14 is formed is comparatively thin (for example, 0.7 mm or less), it fits into the through-hole 26 of the 2nd metal plate 12. Since the width of the protrusion 14 (protrusion end face 18) of the single metal plate 10 is narrower than the width of the laser beam L, a straight line is aimed at the center of the protrusion end face 18 as shown by a welding mark 35 in FIG. Even if the laser beam L is irradiated to the first metal plate 10, the first metal plate 10 and the second metal plate 12 can be suitably welded.

  Next, another example of welding the protrusion 36 fixed to the first metal plate 10 to the second metal plate 12 will be described with reference to FIGS. The protrusion 36 is fixed to the first metal plate 10. The protrusion 36 is, for example, a cylindrical female screw member that is fixed to the first metal plate 10. The protrusion 36 is formed by forming a female screw portion 38 on a cylindrical inner wall. The upper end of the protrusion 36 is a protrusion end surface 40. The protrusion 36 is not limited to the cylindrical female screw member. The second metal plate 12 is formed with a through hole 42 having a shape matching the outer shape of the cylindrical protrusion 36. If the protruding height of the cylindrical protrusion 36 from the first metal plate 10 is “h” and the thickness of the second metal plate 12 (depth of the through hole 42) is “t”, then “h” It is desirable that “t” have the same dimension.

  When the projection 36 fixed to the first metal plate 10 is welded to the second metal plate 12, the cylindrical projection 36 is fitted into the through hole 42 of the second metal plate 12 (FIG. 8). Thereby, from one surface 12a of the second metal plate 12 (the surface on the side irradiated with the laser beam), a weld in which the outline of the protrusion 36 and the outline of the through hole 42 of the second metal plate 12 are matched. An index line 44 appears. Inside the welding index line 44, a projection end surface 40 of the annular projection 36 and a circular internal space 46 can be seen inside.

  Here, when the projection 36 and the second metal plate 12 are welded, the laser beam L is irradiated along the welding index line 44 around the welding index line 44. By irradiating the laser beam L, the protrusion 36 located inside the welding index line 44 (however, the female screw part 38 is not melted) and the second metal plate located outside the welding index line 44. 12 melts. Thereafter, the projection 36 at the melted location and the second metal plate 12 at the melted location are integrally fixed, and the projection 36 fixed to the first metal plate 10 and the second metal plate 12 are welded. . As a result, the protrusion 36 is fixed to the first metal plate 10 and the second metal plate 12. In this way, the first metal plate 10 existing at the blind spot position of the second metal plate 12 and any member positioned on the front side of the second metal plate 12 are fixed using male screws (not shown). be able to. The cross-sectional outer shape of the protrusion 36 and the shape of the through hole 42 of the second metal plate 12 may be a polygonal shape such as a hexagon in addition to the cylindrical shape.

In this embodiment, the description of the type of laser and the structure of the laser processing machine is omitted, but the laser is a gas laser (carbon dioxide laser etc.), a solid laser (YAG laser etc.), a semiconductor laser, a liquid laser. Various lasers that are conventionally known or put into practical use, such as the above, can be used depending on the application. In the laser processing machine, the laser irradiation unit (oscillator) or the member to be welded can be appropriately moved in the vertical direction and the parallel direction at an arbitrary speed.
In the above embodiment, the laser beam has been described. However, in the electron beam welding in which the filament is heated in vacuum and the emitted electrons are accelerated and converged so that the electron beam is applied to the member to be welded and welded. However, the technique of the present invention is applicable.

  The welding method using non-contact welding such as laser welding or electron beam welding according to the present invention enables high-precision welding without worrying about poor welding, insufficient welding strength, or even inability to weld. It can be suitably applied to the welding of thin plates used for home appliances and electronic products that require a high degree of temperature. Further, in the present invention, when irradiating a laser beam or an electron beam, an accurate irradiation position can be clearly and easily grasped from the irradiation side. Therefore, it is stable without being clamped and fixed, and no jigs are required. For this reason, it is possible to realize a significant cost reduction and labor reduction in laser welding and electron beam welding, so that versatility is improved and it can be expected that it can be used in various fields in the future.

DESCRIPTION OF SYMBOLS 10 1st metal plate 12 2nd metal plate 12a Surface 14 Protrusion part 22 1st protrusion side surface 24 2nd protrusion side surface 26 Through-hole 28 Inner wall 30 Welding indicator line 32 Welding trace 34 Welding trace 36 Protruding part 42 Through-hole 44 Welding indicator line

Claims (6)

It is a welding method by non-contact welding for welding the first welded member and the second welded member,
Forming a projection in the first welded member, and forming a through hole in the second welded member for fitting with the projection of the first welded member;
The protruding portion of the first welded member is inserted and fitted into the through hole of the second welded member, and the fitting position of the protruding portion and the through hole is set to the first position of the second welded member. Expose on the surface side opposite to the location of the welded member,
Welding by non-contact welding characterized in that a laser beam or an electron beam is irradiated at or near the fitting position to weld the first welded member and the second welded member located at the irradiated location. Method. When the protruding portion of the first welded member is inserted and fitted into the through hole of the second welded member, the protruding end surface of the protruding portion of the first welded member in the second welded member The welding method by non-contact welding according to claim 1, wherein the welding method is arranged at a height equal to or close to a surface opposite to the insertion side. A laser beam or an electron beam is irradiated from the surface of the second welded member opposite to the first welded member along the fitting position between the side surface of the protrusion and the inner wall of the through hole. The welding method by non-contact welding according to claim 1 or 2. The welding method by non-contact welding according to any one of claims 1 to 3, wherein a height of the protrusion is the same as a plate thickness of the second member to be welded. The welding method by non-contact welding according to claim 1, wherein a side surface of the protrusion is tapered. 6. The plurality of projections of the first member to be welded and a plurality of the through holes of the second member to be welded are formed at the same predetermined interval, respectively. A welding method by non-contact welding according to claim 1.

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