Manufacturing method of on-vehicle part and welding member

Abstract

To provide a technique which hardly generates poor weld of a welding member.SOLUTION: There is provided a manufacturing method of an on-vehicle part which includes: a body member; and a welding member which is mounted in the body member by resistance welding using a first electrode and a second electrode. In the manufacturing method of the on-vehicle part, a welding end of the welding member is brought into contact with a welding surface of the body member. In the manufacturing method of the on-vehicle part, the welding member is welded to the body member by the resistance welding. In the welding, the first electrode is brought into contact with a non-welding surface on an opposite side of the welding surface of the body member and the second electrode is brought into contact with a contact surface which is formed in a part of an outer peripheral surface extending from the welding end of the welding member and is provided to face an opposite side of the welding end.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a manufacturing method for an in-vehicle component having a welded member attached by resistance welding, and the welded member. [Background technology]

[0002] Patent Document 1 discloses a welding method in which an exhaust pipe with a projection formed thereon and another member are attached to a joining jig provided in a ring projection welding machine, and the exhaust pipe and the other member are joined by ring projection welding. In this welding method, pressure and electricity are applied while the exhaust pipe and the other member are sandwiched from above and below by the joining jig. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2006-150397 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, there are various shapes and configurations of welding members that are attached to a main body member by resistance welding, and the welding members selected vary depending on the application and the environment of use, etc. In the welding method of Patent Document 1, depending on the dimensional accuracy of the electrode and the welding member, the contact between the electrode and the welding member may be insufficient, and the current may not flow evenly through the welding member, resulting in poor welding of the welding member to the main body member.

[0005] An object of one aspect of the present disclosure is to provide a technique for reducing the occurrence of welding defects in welded members. [Means for solving the problem]

[0006] One aspect of the present disclosure is a method for manufacturing an on-board part to be mounted on a vehicle, the method comprising a main body member and a welded member attached to the main body member by resistance welding using a first electrode and a second electrode. The method for manufacturing the on-board part comprises contacting a weld end of the welded member with a welded surface of the main body member. The method for manufacturing the on-board part comprises welding the welded member to the main body member by resistance welding. During the welding, the first electrode is brought into contact with a non-welded surface opposite the welded surface of the main body member, and the second electrode is brought into contact with a contact surface formed on a part of the outer circumferential surface extending from the weld end of the welded member and facing the opposite side of the welded end.

[0007] According to this configuration, since the contact surface faces the opposite side to the weld end, the contact between the weld member and the second electrode can be improved, and the flow of current during resistance welding can be promoted, thereby making it possible to reduce the occurrence of poor welding of the weld member to the main body member.

[0008] In one embodiment of the present disclosure, the welding member may have a recess on the outer peripheral surface, and the inner surface of the recess may have a contact surface. With this configuration, it is possible to promote an increase in the contact area between the second electrode and the welding member, and promote the flow of current in resistance welding. Therefore, it is possible to make it difficult for welding defects to occur between the welding member and the main body member.

[0009] In one embodiment of the present disclosure, the contact surface may be provided around the outer circumferential surface of the weld member. This configuration can promote an increase in the contact area between the second electrode and the weld member, and promote the flow of current in resistance welding. Therefore, poor welding of the weld member to the main body member can be prevented.

[0010] In one aspect of the present disclosure, the contact surface may be provided near the weld end. With this configuration, a current tends to flow uniformly through the joint between the weld member and the body member during resistance welding. Therefore, poor welding of the weld member to the body member can be prevented.

[0011] In one aspect of the present disclosure, the on-vehicle component may be an exhaust system component for passing exhaust gas. With this configuration, it is possible to reduce the occurrence of welding defects in welded members in the exhaust system component.

[0012] In one aspect of the present disclosure, the resistance welding may be projection welding. With this configuration, it is possible to reduce the occurrence of welding defects of the weld member to the main body member in the projection welding.

[0013] In one aspect of the present disclosure, a direction in which the welding surface and the welding end contacting the welding surface face each other is defined as a first direction, the welding end has a protrusion that contacts the welding surface, and the contact surface may have an overlapping area with a gap along the first direction relative to the protrusion.

[0014] According to this configuration, it is possible to suppress bias in the flow of current in the projection during projection welding, thereby making it possible to reduce the occurrence of welding defects in the weld member to the main body member.

[0015] In one aspect of the present disclosure, the weld member may be welded to the body member with the weld end facing upward. With this configuration, resistance welding can be performed by applying pressure to the body member from above with the body member disposed above the weld member, and therefore the structure of the device used for resistance welding can be prevented from becoming complicated.

[0016] One aspect of the present disclosure is a welded member that is attached to a welded surface of a body member of an on-vehicle component by resistance welding using two electrodes, the welded member having a weld end and a contact surface. The weld end is welded to the welded surface. The contact surface is a portion formed on a part of an outer circumferential surface extending from the weld end, facing the opposite side of the weld end, and is a portion that comes into contact with one of the electrodes.

[0017] According to this configuration, since the contact surface faces the opposite side to the weld end, the contact between the weld member and the second electrode can be improved, and the flow of current during resistance welding can be promoted, thereby making it possible to reduce the occurrence of poor welding of the weld member to the main body member. [Brief description of the drawings]

[0018] [Figure 1] FIG. 2 is a diagram illustrating a part of an on-vehicle component according to the first embodiment. [Diagram 2] 2 is a cross-sectional view showing a schematic state of a main body member and a workpiece before ring projection welding in the first embodiment. FIG. [Diagram 3] 4 is a plan view showing a state in which a second electrode is in contact with a recessed portion of a workpiece in the first embodiment. FIG. [Figure 4] FIG. 2 is a schematic cross-sectional view for explaining ring projection welding of a main body member and a workpiece in the first embodiment. [Diagram 5] FIG. 11 is a cross-sectional view showing a schematic state of a main body member and a workpiece before ring projection welding in a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings. [1. First embodiment] [1-1. Composition of in-vehicle parts] The on-vehicle part 100 shown in Fig. 1 is an exhaust system part mounted on a vehicle. The exhaust system part is a part that constitutes at least a part of a flow path for passing exhaust gas from an internal combustion engine mounted on the vehicle. Examples of the exhaust system part include an exhaust manifold, an exhaust pipe, a catalytic converter, a muffler, etc.

[0020] As shown in FIG. 1, the on-vehicle component 100 includes a main body member 1 and a workpiece 2. The on-vehicle component 100 is a component in which the main body member 1 and the workpiece 2 are welded by resistance welding. In resistance welding, welding is performed by applying pressure to the main body member 1 and the workpiece 2 while passing an electric current, and thereby causing the pressurized portion, which has a smaller cross-sectional area of ​​the current than other portions, to heat up and melt. Details will be described later, but in the first embodiment, the workpiece 2 is welded to the main body member 1 by ring projection welding, which is a type of resistance welding. Note that in FIGS. 1, 2, and 4, only a portion of the main body member 1 is shown diagrammatically.

[0021] <Main body parts> The main body member 1 shown in Fig. 1 forms a flow path for passing exhaust gas. The main body member 1 is made of metal and is configured of a plate-shaped member. For example, the cylindrical main body member 1 is formed by rolling up a plate-shaped metal member. The main body member 1 has a welded surface 11, a non-welded surface 12, and an insertion hole 13.

[0022] The welding surface 11 is the surface to which the workpiece 2 is welded, and is the outer surface of the main body member 1, i.e., the surface opposite the flow path. The area of ​​the welding surface 11 to which the workpiece 2 is welded is flat. The non-welding surface 12 is the surface opposite to the welding surface 11, and is the inner surface of the main body member 1.

[0023] The insertion hole 13 is a through hole formed in the main body member 1, penetrating the welded surface 11 and the non-welded surface 12. The insertion hole 13 is a hole that allows a tip of an attachment 3 (described later) to reach a flow path formed in the main body member 1 from outside the main body member 1. The size of the insertion hole 13 may be large enough that a part of the attachment 3 passes through it.

[0024] <Work> 1 is a joining member for attaching an attachment 3 to an on-vehicle component 100. The attachment 3 is, for example, a sensor, and the work 2 is configured as a sensor boss that holds the sensor inserted into an insertion hole 13 of the main body member 1. The work 2 is attached to a welding surface 11 of the main body member 1.

[0025] The workpiece 2 is made of metal and has a cylindrical shape. The workpiece 2 has a curved central axis A extending from a welded end 21 to a non-welded end 22 described below. The workpiece 2 has a recess 20, the welded end 21, the non-welded end 22, an outer circumferential surface 23, a communication passage 24, and a protrusion 25.

[0026] The welded end 21 is an end that is welded to the welding surface 11 of the main body member 1. The non-welded end 22 is an end opposite to the welded end 21. The welded end 21 and the non-welded end 22 are both flat and intersect with the central axis A approximately perpendicularly.

[0027] The central axis A passes through approximately the center of a cross section of the workpiece 2 perpendicular to the central axis A. As an example, the central axis A extends from the center of the welded end 21 to the center of the non-welded end 22. As shown in Fig. 1, the central axis A extends linearly from the welded end 21, curves, and then extends linearly to the non-welded end 22 while being inclined with respect to the welded end 21.

[0028] The outer peripheral surface 23 is a surface that extends from the welded end 21 to the non-welded end 22. In other words, the outer peripheral surface 23 is a side surface of the workpiece 2. 1, the communication passage 24 is a through hole formed in the workpiece 2, and passes through the welded end 21 and the non-welded end 22. The communication passage 24 extends linearly from the welded end 21 to the non-welded end 22, and is inclined with respect to the welded end 21. The attachment 3 can be inserted through the communication passage 24.

[0029] The communication passage 24 has a small diameter portion 241 and a large diameter portion 242. The small diameter portion 241 has a first opening 243 and a second opening 244. The first opening 243 is located at the welded end portion 21. The second opening 244 communicates with the large diameter portion 242. The first opening 243 is connected to the insertion hole 13 when the workpiece 2 is welded to the main body member 1. The large diameter portion 242 has a larger diameter than the small diameter portion 241. Among the openings of the large diameter portion 242, the opening that does not communicate with the small diameter portion 241 is located at the non-welded end portion 22. In addition, the attachment 3 may be threaded, and the large diameter portion 242 may be threaded to be screwed into the thread of the attachment 3.

[0030] 2, the protrusion 25 is provided on the weld end 21. The protrusion 25 is a portion to which pressure is applied and current flows by ring projection welding. The protrusion 25 is melted by resistance heat generated by the application of pressure and the flow of current, and the workpiece 2 is welded to the main body member 1.

[0031] The protrusion 25 is formed in an annular shape so as to surround the first opening 243. In other words, the protrusion 25 is provided so as to go around the edge of the welded end 21. Moreover, the protrusion 25 is provided between the edge of the welded end 21 and the first opening 243. The protrusion 25 has a trapezoidal shape tapering toward the tip of the protrusion 25 in a cross-sectional view perpendicular to the circumferential direction centered on the central axis A. Moreover, the height of the top of the protrusion 25 is approximately constant.

[0032] The shape and position of the protrusion 25 can be determined as appropriate. For example, the protrusion 25 may be triangular or rectangular in the cross-sectional view. For example, the protrusion 25 may be disposed near the edge of the welded end 21 or near the first opening 243.

[0033] As shown in FIG. 1, the recess 20 is formed on the outer peripheral surface 23 in the vicinity of the welded end 21. The recess 20 is formed on the outer peripheral surface 23 in the entire circumferential direction and recessed toward the central axis A. The recess 20 has a first inner surface 201, a second inner surface 202, and a third inner surface 203. The first inner surface 201 is a surface facing the opposite side of the welded end 21 and extends in a substantially flat shape. The first inner surface 201 is a surface substantially parallel to the welded end 21. The second inner surface 202 is a surface extending from an end of the first inner surface 201 closer to the central axis A and is a surface substantially perpendicular to the welded end 21. The second inner surface 202 is substantially circular in a cross-sectional view perpendicular to the central axis A. The third inner surface 203 is a surface extending from an end of the second inner surface 202 on the non-welded end 22 side and is a surface substantially parallel to the welded end 21. The third inner surface 203 is also substantially planar like the first inner surface 201. Therefore, the first inner surface 201 and the third inner surface 203 face each other. Note that the shape of the recess 20 is not limited to this, and for example, the shape of the recess 20 may be semicircular in a cross-sectional view perpendicular to the circumferential direction.

[0034] The distance between the second inner surface 202 and the outer circumferential surface 23 (in other words, the depth of the recess 20) is preferably, for example, 3 mm to 4 mm. The depth of the recess 20 is not limited thereto, and may be deep enough so that the first inner surface 201 has an area where it overlaps with the protrusion 25 with a gap in the direction in which it is pressed during ring projection welding. The direction in which it is pressed during ring projection welding is the pressing direction P shown in FIG. 4, which is a direction approximately perpendicular to the welding surface 11, the welding end 21, and the upper surface 61 of the fixing base 6 described later.

[0035] [1-2. Manufacturing methods for in-vehicle parts] Next, a manufacturing method of the on-vehicle component 100 will be described with reference to Figures 2, 3, and 4. Specifically, a welding method of the workpiece 2 included in the manufacturing method of the on-vehicle component 100 will be described. The manufacturing method of the on-vehicle component 100 includes a contacting step shown in Figure 2 and a welding step shown in Figure 4. In the manufacturing method of the on-vehicle component 100, the workpiece 2 is welded to the main body member 1 by ring projection welding using a welding device including a first electrode 4, a second electrode 5, a fixing base 6, and a receiving jig 7.

[0036] <First electrode and second electrode> The first electrode 4 and the second electrode 5 shown in FIG. 2 are members for passing a current through the projection 25 during ring projection welding.

[0037] The first electrode 4 is disposed so as to contact the non-welding surface 12 of the main body member 1. As shown in Fig. 3, the second electrode 5 is a rectangular plate-shaped member. The second electrode 5 has a pair of first portions 5a and a second portion 5b. The first portion 5a and the second portion 5b each have cutout surfaces 51a, 51b, upper surfaces 52a, 52b, lower surfaces 53a, 53b, cutout upper surfaces 54a, 54b, and cutout side end surfaces 55a, 55b.

[0038] The cutout surfaces 51a and 51b are cutouts formed in the end surfaces forming the short sides of the second electrode 5, and are formed to follow the curved shape of the recess 20. The cutout surfaces 51a and 51b are also portions that can come into contact with the second inner surface 202 during ring projection welding.

[0039] The upper surfaces 52a, 52b are surfaces that face the welding surface 11 during ring projection welding, and come into contact with the first inner surface 201 at notched upper surfaces 54a, 54b described below. The notched upper surfaces 54a, 54b are peripheral portions of the notched surfaces 51a, 51b on the upper surfaces 52a, 52b.

[0040] The notch side end faces 55a, 55b are end faces formed on both sides of the notch surfaces 51a, 51b, and come into contact with the notch side end faces of the other side. The lower faces 53a, 53b are faces opposite to the upper faces 52a, 52b, and are portions that can come into contact with the third inner face 203 around the notch surfaces 51a, 51b during ring projection welding.

[0041] <Fixed stand> 2 is a member on which a receiving jig 7, which will be described later, can be placed. The upper surface 61 of the fixed base 6 is flat. The fixed base 6 is insulated by an insulating material such as nylon.

[0042] <Receiving jig> The receiving jig 7 shown in Fig. 2 is a member that holds the workpiece 2. The receiving jig 7 is configured to support the non-welded end 22 of the workpiece 2 from below. The receiving jig 7 is made of an insulating material. Examples of insulating materials include nylon, plastic, and insulating metal. The receiving jig 7 has a bottom surface 71, a top surface 72, a side surface 73, and an insertion portion 74.

[0043] <Contact process> As shown in FIG. 2, in the contact step, the protrusion 25 formed on the weld end 21 of the workpiece 2 is brought into contact with the weld surface 11 of the main body member 1.

[0044] Specifically, first, the receiving jig 7 is placed on the fixed base 6. Next, the work 2 is placed so that the insertion portion 74 of the receiving jig 7 placed on the fixed base 6 is inserted into the large diameter portion 242 of the work 2. Next, the second electrode 5 is placed so as to contact the recess 20. Specifically, as shown in FIG. 2 and FIG. 3, the recess 20 is sandwiched between the first part 5a and the second part 5b from both sides so that the cutout surfaces 51a, 51b face each other. As a result, the cutout side end surfaces 55a, 55b come into contact with each other, and the cutout upper surfaces 54a, 54b come into contact with the first inner surface 201. At this time, the cutout upper surfaces 54a, 54b are placed so as to overlap the protrusion 25 with a gap in the pressing direction P.

[0045] It is sufficient that at least the notched upper surfaces 54a, 54b of the second electrode 5 are in contact with the first inner surface 201. The notched surfaces 51a, 51b may or may not be in contact with the second inner surface 202, and the peripheral portions of the notched surfaces 51a, 51b on the lower surfaces 53a, 53b may or may not be in contact with the third inner surface 203.

[0046] Next, the main body member 1 is placed. As shown in Fig. 2, the main body member 1 is placed above the welding end portion 21 so that the first opening 243 and the insertion hole 13 of the main body member 1 overlap, and the protrusion 25 and the welding surface 11 are brought into contact with each other.

[0047] Next, the first electrode 4 is placed. As shown in Fig. 2, the first electrode 4 is placed above the main body member 1, and the non-welding surface 12 and the first electrode 4 are brought into contact with each other. At this time, the first electrode 4 is placed so that the first electrode 4, the protrusion 25, and the notched upper surfaces 54a, 54b overlap with a gap in the pressing direction P. Note that the surface of the first electrode 4 facing the main body member 1 and the upper surfaces 52a, 52b extend approximately parallel to each other.

[0048] <Welding process> 4, in the welding process, ring projection welding is performed in a state where the workpiece 2 and the main body member 1 are in contact with each other, the first electrode 4 is in contact with the non-welding surface 12, and the notched upper surfaces 54a, 54b of the second electrode 5 are in contact with the first inner surface 201. That is, ring projection welding is performed in a state where the main body member 1 and the workpiece 2 are sandwiched between the first electrode 4 and the second electrode 5.

[0049] Specifically, first, the first electrode 4 is moved downward to press the main body member 1 against the workpiece 2, and a force in the pressing direction P is applied to the main body member 1 and the workpiece 2. At this time, the second electrode 5 is held by a holding member (not shown) with the notched upper surfaces 54a, 54b in contact with the first inner surface 201, so that the force in the pressing direction P can be received by the second electrode 5.

[0050] Furthermore, since the receiving jig 7 receives a force in the pressing direction P while holding the workpiece 2, the bottom surface 71 of the receiving jig 7 receives a force in the opposite direction to the pressing direction P.

[0051] While the main body member 1 and the workpiece 2 are being pressed as described above, electricity is passed between the first electrode 4 and the second electrode 5. As a result, a current flows from the first electrode 4 to the second electrode 5 via the main body member 1, the protrusion 25, and the first inner surface 201, as indicated by an arrow Y in FIG.

[0052] [Second embodiment] [2-1. Differences from the first embodiment] Next, the second embodiment will be described with reference to Fig. 5. The second embodiment differs from the first embodiment in the shape of the workpiece. Below, the differences between the first embodiment and the second embodiment will be described, and the same parts as the first embodiment will be denoted by the same reference numerals as the first embodiment, and detailed description will be omitted.

[0053] <Work> In the first embodiment, the workpiece 2 has a curved central axis A and a linearly extending communication passage 24, and is configured as a curved tubular member extending along the central axis A. On the other hand, the workpiece 2 in the second embodiment has a curved central axis A and a linearly extending communication passage 24 similar to the first embodiment, but differs from the first embodiment in that a thick portion is formed on the outer circumferential side of the central axis A.

[0054] That is, the non-welded end 22 of the work 2 is provided with a first non-welded end surface 221 and a second non-welded end surface 222. The first non-welded end surface 221 is provided adjacent to the thick portion, is planar, and extends substantially parallel to the welded end 21, and contacts the fixed base 6. The second non-welded end surface 222 is configured similarly to the non-welded end 22 of the first embodiment. That is, the second non-welded end surface 222 is planar and extends from the first non-welded end surface 221 in a direction inclined at an acute angle to the welded end 21. In addition, the second non-welded end surface 222 extends so as to intersect substantially perpendicularly with the central axis A, and contacts the receiving jig 7.

[0055] <Contact process> In the first embodiment, the non-welded end 22 contacts the upper surface 72 of the receiving jig 7. On the other hand, in the second embodiment, the first non-welded end surface 221 contacts the upper surface 61 of the fixed base 6, and the second non-welded end surface 222 contacts the upper surface 72 of the receiving jig 7.

[0056] <Welding process> In the first embodiment, the bottom surface 71 of the receiving jig 7 received a force in the opposite direction to the pressing direction P. On the other hand, as shown in Fig. 5, in the second embodiment, a force in the pressing direction P is applied to the main body member 1 and the workpiece 2 in a state in which the first non-welded end surface 221 and the upper surface 61 of the fixed base 6 are in contact with each other and the bottom surface 71 of the receiving jig 7 and the upper surface 61 of the fixed base 6 are in contact with each other. As a result, the first non-welded end surface 221 and the bottom surface 71 of the receiving jig 7 receive a force in the opposite direction to the pressing direction P.

[0057] [3. Effects] According to the first and second embodiments described above in detail, the following effects can be obtained. (a) In the case where the second electrode 5 is configured to contact only the curved portion of the outer peripheral surface 23 of the workpiece 2 during ring projection welding, the contact is likely to be insufficient depending on the dimensional accuracy of the workpiece 2 and the second electrode 5. In this case, the current does not flow easily, and a welding defect may occur. On the other hand, in the first and second embodiments, the outer peripheral surface 23 of the workpiece 2 is provided with a recess 20. With this configuration, the second electrode 5 can contact the flat portion of the outer peripheral surface 23 of the workpiece 2, and the contact between the second electrode 5 and the workpiece 2 can be improved. Therefore, the flow of the current can be promoted, and the welding defect of the workpiece 2 to the main body member 1 can be prevented from occurring.

[0058] (b) According to the above configuration, the second electrode 5 can be in contact with a maximum of three surfaces of the recess 20, namely the first inner surface 201, the second inner surface 202, and the third inner surface 203, so that the contact area between the second electrode 5 and the workpiece 2 can be increased. This can promote the flow of current. Also, the cooling efficiency by the second electrode 5 can be promoted. This can make it difficult for welding defects to occur between the main body member 1 and the workpiece 2.

[0059] (c) In the first and second embodiments, the recesses 20 are provided around the entire circumference of the workpiece 2 in the circumferential direction centered on the central axis A of the workpiece 2. This configuration can promote an increase in the contact area between the second electrode 5 and the workpiece 2. This can promote the flow of current. In addition, the cooling efficiency of the second electrode 5 can be improved. This can make it less likely that poor welding of the workpiece 2 to the main body member 1 will occur.

[0060] (d) When the second electrode 5 comes into contact with the outer peripheral surface 23, if the protrusion 25 and the second electrode 5 do not have an area where they overlap with a gap in the pressing direction P, the current may concentrate on the outer peripheral portion of the protrusion 25, which may cause dust or protrusion (dust, etc.). On the other hand, in the first and second embodiments, the first electrode 4, the protrusion 25, and the notched upper surfaces 54a and 54b of the second electrode 5 are arranged so as to overlap with a gap in the pressing direction P. With this configuration, it is possible to prevent the current from concentrating and flowing on the outer peripheral portion of the protrusion 25, and to prevent the occurrence of dust, etc. Therefore, it is possible to make it difficult for poor welding of the workpiece 2 to the main body member 1 to occur.

[0061] (e) In the first and second embodiments, the recess 20 is provided near the weld end 21 of the workpiece 2. With this configuration, the first electrode 4 and the second electrode 5 are disposed in close proximity to each other, which facilitates a uniform flow of current to the protrusion 25 during ring projection welding. This makes it possible to reduce the likelihood of poor welding of the workpiece 2 to the main body member 1.

[0062] (f) In the first and second embodiments, the workpiece 2 and the body member 1 are joined by ring projection welding. With this configuration, it is possible to prevent a gap from being generated between the workpiece 2 and the body member 1.

[0063] (g) In the first and second embodiments, a current flows from the first electrode 4 to the second electrode 5 through the main body member 1, the protrusion 25, and the first inner surface 201. According to this configuration, the contact area between the second electrode 5 and the first inner surface 201 can be adjusted by adjusting the depth of the recess 20. Therefore, by increasing the contact area with the second electrode 5 at a specific portion of the recess 20 and promoting the flow of current in that portion during ring projection welding, it is possible to adjust the occurrence of spatter or the like in the direction in which that portion is located around the weld end 21. Depending on the welding member, the position at which spatter or the like is allowed to occur differs. Therefore, by adjusting the depth of the recess 20, spatter or the like can be generated at a position where spatter or the like may be generated, and conversely, spatter or the like can be suppressed from being generated at a position where spatter or the like is not desired to be generated.

[0064] (h) In the first and second embodiments, during ring projection welding, pressure is applied with the notched upper surfaces 54a, 54b of the second electrode 5 in contact with the first inner surface 201. With this configuration, pressure can be applied in the pressing direction P by the second electrode 5. This reduces the force applied to the receiving jig 7, making it possible to reduce the size of the receiving jig 7. Furthermore, since the load on the workpiece 2 itself is reduced, the shape of the workpiece 2 can be simplified.

[0065] (i) In the first and second embodiments, the workpiece 2 is welded to the main body member 1 with the weld end 21 of the workpiece 2 facing upward. This enables ring projection welding by applying pressure to the main body member 1 arranged above the workpiece 2 with the first electrode 4. This configuration makes it possible to prevent the structure of the device used for ring projection welding from becoming complicated.

[0066] In the first embodiment, the workpiece 2 corresponds to an example of a welding member, the first inner surface 201 corresponds to an example of a contact surface, and the pressing direction P corresponds to a first direction.

[0067] [4. Other embodiments] Although the embodiments of the present disclosure have been described above, it goes without saying that the present disclosure is not limited to the above-described embodiments and can take various forms.

[0068] (a) In the first and second embodiments, the second electrode 5 is composed of the first and second portions 5a, 5b. However, the second electrode 5 may be composed of three or more portions. The three or more portions may be arranged in the recess 20 of the workpiece 2 so as to be aligned along the circumferential direction, as in the first and second embodiments, and a current may be passed through these portions when projection welding is performed.

[0069] (b) In the first and second embodiments, ring projection welding is exemplified as the resistance welding for welding the workpiece 2 to the main body member 1, but the method for welding the workpiece 2 to the main body member 1 is not limited to this. For example, the resistance welding may be projection welding other than ring projection welding. In the case of projection welding, the workpiece 2 has a plurality of protrusions 25 at the weld end 21, and the plurality of protrusions 25 are arranged at intervals.

[0070] Furthermore, for example, the resistance welding may be spot welding. In the case of spot welding, the workpiece 2 does not have a protrusion 25 at the weld end 21. The first electrode 4 has a tapered tip portion as a portion facing the non-welding surface 12. In spot welding, the tip portion of the first electrode 4 presses the main body member 1, and current is passed through the pressurized portion, causing the pressurized portion to heat up and melt, thereby welding the workpiece 2 to the main body member 1.

[0071] (c) In the first and second embodiments, the protrusion 25 is provided on the weld end 21 of the work 2, but the position at which the protrusion 25 is provided is not limited to this. For example, the protrusion 25 may be provided around the insertion hole 13 on the welding surface 11 of the main body member 1. Also, for example, when spot welding is performed, the protrusion 25 does not have to be provided on either the work 2 or the main body member 1.

[0072] (d) In the first and second embodiments, the recess 20 is provided near the weld end 21 on the outer peripheral surface 23 of the workpiece 2. However, this is not limiting, and the recess 20 may be provided at a position away from the weld end 21 on the outer peripheral surface 23. Also, instead of the recess 20, a flange-shaped portion may be formed surrounding the edge of the weld end 21, and the surface of the portion opposite the weld end 21 may be used as a contact surface that comes into contact with the second electrode 5 during resistance welding.

[0073] (e) In the first and second embodiments, the second electrode 5 is brought into contact with the workpiece 2, and then the first electrode 4 is brought into contact with the main body member 1, but the order in which the electrodes are brought into contact is not limited to this. For example, the first electrode 4 may be brought into contact with the main body member 1, and then the second electrode 5 may be brought into contact with the workpiece 2.

[0074] (f) In the first and second embodiments, the receiving jig 7 has an insertion portion 74, and the large diameter portion 242 of the communication passage 24 is inserted into the insertion portion 74 to hold the workpiece 2, but the shape of the receiving jig 7 is not limited to this. For example, the receiving jig 7 may be configured to be composed of two or more members and to hold the workpiece 2 so that the members cover the outer circumferential surface 23 other than the non-welded end portion 22 and the recessed portion 20. Also, for example, the receiving jig 7 may not have an insertion portion 74.

[0075] (g) In the first and second embodiments, the workpiece 2 has been illustrated as having a curved central axis A (in other words, the central axis A has a portion that is inclined relative to the welded end 21), but the shape of the workpiece 2 is not limited to this. For example, the workpiece 2 may extend linearly from the welded end 21 to the non-welded end 22 with the central axis A inclined relative to the welded end 21 of the workpiece 2.

[0076] Also, for example, the workpiece 2 may have a central axis A that extends linearly, and may have a shape that extends along the central axis A. Then, in the contact step, the workpiece 2 may be disposed so that the central axis A is approximately perpendicular to the welding surface 11 of the main body member 1.

[0077] (h) In the first and second embodiments, in the welding step in the manufacturing method of the in-vehicle component 100, the first electrode 4 is pressed by moving downward, but the pressing direction is not limited to this. For example, in a state in which the main body member 1 and the first electrode 4 are fixed and the notched upper surfaces 54a, 54b of the second electrode 5 are in contact with the first inner surface 201, the receiving jig 7 may be pressed by moving from below to above.

[0078] (i) In the first and second embodiments, the on-vehicle part 100 is an exhaust system part, but this is not limited thereto. For example, the on-vehicle part 100 may be other parts used in a heat exchanger or the like.

[0079] (j) In the first and second embodiments, the workpiece 2 was a sensor boss for holding a sensor, but this is not limited to this and may be, for example, another joining member for attaching the attachment 3 to the in-vehicle component 100.

[0080] (k) In the first and second embodiments, the workpiece 2 is welded to the main body member 1 with the weld end 21 of the workpiece 2 facing upward, but the orientation of the workpiece 2 during welding is not limited to this. For example, the workpiece 2 may be welded to the main body member 1 with the weld end 21 of the workpiece 2 facing downward.

[0081] (l) Multiple functions possessed by one component in the above embodiments may be realized by multiple components, or one function possessed by one component may be realized by multiple components. Also, multiple functions possessed by multiple components may be realized by one component, or one function realized by multiple components may be realized by one component. Also, part of the configuration of the above embodiments may be omitted. Also, at least part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments.

[0082] [5. Technical Concepts Disclosed in This Specification] [Item 1] A method for manufacturing an on-vehicle part to be mounted on a vehicle, the method comprising: a main body member; and a welded member attached to the main body member by resistance welding using a first electrode and a second electrode, the method comprising the steps of: contacting a weld end of the weld member with a weld surface of the body member; welding the welded member to the main body member by resistance welding in a state in which the first electrode is in contact with a non-welded surface of the main body member opposite the welded surface and the second electrode is in contact with a contact surface formed on a part of an outer circumferential surface extending from the welded end of the welded member and facing the opposite side of the welded end; A method for manufacturing an in-vehicle part comprising the steps of:

[0083] [Item 2] A method for manufacturing an in-vehicle part according to item 1, the welding member has a recess on the outer circumferential surface, and the recess has the contact surface on an inner surface.

[0084] [Item 3] A method for manufacturing an on-vehicle part according to item 1 or 2, The contact surface is provided so as to surround the outer circumferential surface of the welded member.

[0085] [Item 4] A method for manufacturing an on-vehicle part according to any one of items 1 to 3, The contact surface is provided in the vicinity of the weld end portion.

[0086] [Item 5] A method for manufacturing an on-vehicle part according to any one of items 1 to 4, The method for manufacturing an on-vehicle part, wherein the on-vehicle part is an exhaust system part for passing exhaust gas.

[0087] [Item 6] A method for manufacturing an on-vehicle part according to any one of items 1 to 5, The method for manufacturing an in-vehicle component, wherein the resistance welding is projection welding.

[0088] [Item 7] Item 6. A method for manufacturing an in-vehicle part according to item 6, A direction in which the welding surface and the welding end portion in contact with the welding surface face each other is defined as a first direction, The welding end has a protrusion that contacts the welding surface, The contact surface has an area that overlaps the protrusion along the first direction with a gap therebetween. Manufacturing method for automotive parts.

[0089] [Item 8] A method for manufacturing an on-vehicle part according to any one of items 1 to 7, The weld member is welded to the body member with the weld end facing upward. Manufacturing method for automotive parts.

[0090] [Item 9] A welded member that is attached to a welding surface of a main body member of an on-vehicle component by resistance welding using two electrodes, a weld end portion welded to the weld surface; a contact surface that is formed on a part of an outer circumferential surface extending from the welding end and faces the opposite side of the welding end, the contact surface being a portion that comes into contact with one of the electrodes; A welded member comprising: [Explanation of symbols]

[0091] 1...main body member, 2...workpiece, 3...attachment, 4...first electrode, 5...second electrode, 5a...first portion, 5b...second portion, 6...fixed base, 7...receiving jig, 11...welding surface, 12...non-welding surface, 13...insertion hole, 20...recess, 21...welding end, 22...non-welding end, 23...outer periphery, 24...connecting passage, 25...projection, 51a, 51b...notched surface, 52a, 5 2b...top surface, 53a, 53b...bottom surface, 54a, 54b...notched top surface, 55a, 55b...notched side end surface, 100...vehicle-mounted part, 201...first inner surface, 202...second inner surface, 203...third inner surface, 221...first non-welded end surface, 222...second non-welded end surface, 241...small diameter portion, 242...large diameter portion, 243...first opening, 244...second opening, A...central axis.

Claims

1. A method for manufacturing an on-vehicle part to be mounted on a vehicle, the method comprising: a main body member; and a welded member attached to the main body member by resistance welding using a first electrode and a second electrode, the method comprising the steps of: contacting a weld end of the weld member with a weld surface of the body member; welding the welded member to the main body member by resistance welding in a state in which the first electrode is in contact with a non-welded surface of the main body member opposite the welded surface and the second electrode is in contact with a contact surface formed on a part of an outer circumferential surface extending from the welded end of the welded member and facing the opposite side of the welded end; A method for manufacturing an in-vehicle part comprising the steps of:

2. A method for manufacturing an in-vehicle part according to claim 1, the welding member has a recess on the outer circumferential surface, and the recess has the contact surface on an inner surface.

3. The method for manufacturing an in-vehicle part according to claim 1 or 2, The contact surface is provided so as to surround the outer circumferential surface of the welded member.

4. The method for manufacturing an in-vehicle part according to claim 1 or 2, The contact surface is provided in the vicinity of the weld end portion.

5. The method for manufacturing an in-vehicle part according to claim 1 or 2, The method for manufacturing an on-vehicle part, wherein the on-vehicle part is an exhaust system part for passing exhaust gas.

6. The method for manufacturing an in-vehicle part according to claim 1 or 2, The method for manufacturing an in-vehicle component, wherein the resistance welding is projection welding.

7. The method for manufacturing an in-vehicle part according to claim 6, A direction in which the welding surface and the welding end portion in contact with the welding surface face each other is defined as a first direction; The welding end has a protrusion that contacts the welding surface, The contact surface has an area that overlaps the protrusion along the first direction with a gap therebetween. Manufacturing method for automotive parts.

8. The method for manufacturing an in-vehicle part according to claim 1 or 2, The method for manufacturing an on-vehicle part, wherein the weld member is welded to the main body member with the weld end facing upward.

9. A welded member that is attached to a welding surface of a main body member of an on-vehicle component by resistance welding using two electrodes, a weld end portion welded to the weld surface; a contact surface that is formed on a part of an outer circumferential surface extending from the welding end and faces the opposite side of the welding end, the contact surface being a portion that comes into contact with one of the electrodes; A welded member comprising:

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