JP2015139790A - Method for manufacturing component to be welded - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a component to be welded whereby the component after welding can be quickly gripped and transported.SOLUTION: A method according to the present invention includes: a joining process in which in a fuel cell 100, a steering member base material 91 and a component are brought into contact with each other at predetermined parts, and the contact parts are joined with each other by welding; and a transportation process in which a joined steering member 90 is gripped and transported. In the joining process, the steering member base material and the component are joined with each other at the parts which are above the steering member base material except a gravity center position b of the steering member, and in the transportation process, the gravity center position of the steering member above the steering member base material is gripped.

Description

  The present invention relates to a method for manufacturing a welded part such as a steering member.

  An automobile is manufactured by joining and assembling tens of thousands of parts by bolting, bonding, or welding. For example, with respect to a steering member disposed in the front part of a passenger compartment, several types of parts such as a steering column and a side bracket are welded to a pipe-like member and attached to a dash panel (see Patent Document 1).

JP 2000-219171 A

  After the steering column, side bracket, etc. are welded to the steering member, the welded steering member is transported from the welding process position to a body part mounting position such as a dash panel. However, the parts after welding are in a state where deformation such as expansion and contraction is likely to occur due to welding. Therefore, it is difficult to grip by the robot, and if waiting for the heat to cool down, the tact time becomes long and rapid production is not possible, and it is difficult to satisfy the production capacity required for mass production etc. is there.

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a method for manufacturing a welded part that can quickly grip and transport the welded part.

  The present invention for achieving the above object is a method for manufacturing a welded part in which a second work is welded to a long first work to form a welded part. In the manufacturing method according to the present invention, the first work and the second work are brought into contact with each other at a predetermined site, the joining process of joining the contact parts by welding, the transporting process of gripping and transporting the joined welded parts, Have In the present invention, in the joining process, the first work and the second work are joined on the first work at a place excluding the center of gravity position of the welded part, and the center of gravity position on the first work of the welded part is gripped in the transporting process. It is characterized by doing.

  In the method for manufacturing a welded part according to the present invention, the second work is joined at a place other than the place where the center of gravity of the welded part is removed in the first work, and the welded part is held at the position of the center of gravity on the first work in the conveying process. Are being transported. As described above, since the part to be gripped at the time of conveyance is a part different from the part where welding is performed, the welded part can be grasped and conveyed without waiting for the heat of welding to cool down. Moreover, since the location to hold | grip is the gravity center position of the welding component in a 1st workpiece | work, even if it is a welding component containing a long 1st workpiece | work, it can convey rapidly, without destroying a balance.

It is a perspective view which shows the manufacturing apparatus of the welding component which concerns on one Embodiment of this invention. It is a top view which shows the manufacturing apparatus. FIG. 3A is a perspective view showing a fixed support of the manufacturing apparatus, and FIG. 3B is a front view showing the fixed support. FIG. 4A is a perspective view showing a movable support of the manufacturing apparatus, and FIG. 4B is a front view showing the movable support. FIG. 5A is a perspective view showing a steering member holding member constituting the manufacturing apparatus, and FIG. 5B is a front view showing the holding member. 6A is a perspective view showing a steering member, and FIG. 6B is a front view. It is a figure explaining the welding process in manufacture of the steering member. It is a figure explaining the welding process in manufacture of the steering member. It is a figure explaining the welding process in manufacture of the steering member. It is a figure explaining the welding process in manufacture of the steering member. It is a figure explaining the welding process in manufacture of the steering member. It is a figure explaining the conveyance process in manufacture of the steering member. It is a figure explaining the conveyance process in manufacture of the steering member.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the following description does not limit the technical scope and terms used in the claims. In addition, the dimensional ratios in the drawings are exaggerated for convenience of explanation, and may differ from actual ratios.

  1 is a perspective view showing a manufacturing apparatus for welded parts according to an embodiment of the present invention, FIG. 2 is a plan view showing the manufacturing apparatus, and FIG. 3A is a perspective view showing a fixed support of the manufacturing apparatus. FIG. 3B is a front view showing the fixed support. 4A is a perspective view showing the movable support of the manufacturing apparatus, FIG. 4B is a front view showing the movable support, and FIG. 5A is a steering member constituting the manufacturing apparatus. FIG. 5 (B) is a front view showing the holding member, FIG. 6 (A) is a perspective view showing the steering member, and FIG. 6 (B) shows the steering member. It is a front view.

  Referring to FIGS. 1 to 6B, a welding component manufacturing apparatus 100 according to this embodiment includes a steering member base material 91 (corresponding to a first workpiece) and components 92 to 98 (corresponding to a second workpiece). Are welded at a predetermined site, and the welding robot 40 is joined by welding at the contacted site. Further, the manufacturing apparatus 100 grips the joined steering member base material 91 and the parts 92 to 98, conveys them to the welding position, and after welding, conveys the welding robot from the welding position to another place, a support tool 70a, 70b and locators 10a and 10b. The hand robot 30 holds the center-of-gravity position b of the steering member 90 after welding in the longitudinal direction of the steering member base material 91. First, the configuration of the manufacturing apparatus 100 will be described in detail below.

  The hand robot 30 has a hand 31 attached to the tip of its arm. The hand robot 30 grips the component in a predetermined direction with the hand 31 and positions and holds the gripped component at the taught position with respect to the steering member base material 91. The parts are placed on the parts table 60, and the hand robot 30 grips the parts from the parts table 60, positions them at a predetermined position on the steering member base material 91, and holds them. The parts are carried into the parts table 60 by another robot (not shown) or a conveyor. Further, instead of the component table 60, the hand robot 30 may grasp the component flowing by the transfer conveyor.

  In the vicinity of the hand 31, a first camera 32 that captures the hand direction of the hand 31 is attached. The first camera 32 is used for capturing the part and grasping the direction and size when the hand 31 takes out the part.

  In addition, a second camera 33 is installed within the work range of this process. The second camera 33 is used for confirming in what direction the component gripped by the hand 31 is gripped. The second camera 33 can capture a wide range of images from the hand robot 30, the welding robot 40, and the positioner 10a to the positioner 10b. Therefore, in the steering member manufacturing apparatus 100, it is possible to confirm at which position each component of the steering member is arranged, and it is possible to measure the position after joining the parts based on the result obtained by photographing.

  The hand robot 30 operates to hold the component from the component table 60 and then hold the component toward the second camera 33. As a result, the second camera 33 captures the part gripped by the hand 31, and it is possible to confirm in what direction and position the part is gripped by the hand 31 by image processing. The hand robot 30 corrects the orientation of the component so that the component can be positioned and held on the steering member base material 91 from the orientation and position of the component confirmed by the second camera 33. Thereby, the steering member base material 91 can be positioned and held at the component position taught with respect to the steering member base material 91. Since the operation for correcting the orientation of the component gripped by the hand 31 is an operation of a general hand robot, description thereof is omitted.

  The welding robot 40 has a welding torch 41 attached to the arm tip. The tip of the welding torch 41 is positioned at a position where the part can be welded with reference to the position of the part positioned on the steering member base material 91. Therefore, the position of the tip of the welding torch 41 is taught on the basis of the part position taught to the hand robot 30. When the component position by the hand robot 30 is corrected, the position of the tip of the welding torch 41 is also corrected accordingly.

  A third camera 42 is attached in the vicinity of the root portion of the welding torch 41. The third camera 42 takes an image of a part that is positioned and held by the hand 31. Then, the position (and / or inclination) of the component is measured from the captured image. Therefore, the third camera 32 has a function of measuring the size of an object in a captured image and the distance between objects (referred to as an intra-image distance measurement function). As an image distance measurement function, for example, an object (reference scale) used as a reference for determining a distance in an image is photographed in advance, and the correspondence between the actual size of the reference scale and the size in the image is obtained. Keep it. Then, the correspondence between the real object and the image on the stored reference scale is used to obtain the size of the object photographed for measurement, the distance between the objects, and the inclination. Such an intra-image distance measuring function may be a well-known one and is not particularly limited.

  The third camera 42 may have a distance measuring function for measuring the distance from the current position of the third camera 42 to the photographed object. As the distance measuring function, a passive distance measuring function used for focusing of the third camera 32, an active distance measuring function using laser light or ultrasonic waves, or the like can be used. The distance measuring function may be a well-known one and is not particularly limited. If such a distance measuring function and an in-image distance measuring function are used, the part position measured by the third camera 42 can be calculated as the position in the operation coordinate system of the welding robot 40.

  Note that the above-described in-image distance measurement function and distance measurement function may also have the second camera 33. Further, the control unit 50 performs image processing for distance measurement within the image, distance measurement performed as necessary, and calculation processing thereof.

  The support tools 70a and 70b grip and hold both ends of the steering member base material 91. The support tools 70 a and 70 b include a support base 71 that serves as a support column for the support tools 70 a and 70 b and a gripping portion 74 that grips the steering member base material 91. The gripping portion 74 includes clampers 75 and 76, a power portion 77 having a power mechanism for operating the clampers 75 and 76, positioning pins 78 and 79 for positioning members attached to both ends of the steering member base material 91, Have In addition to the above configuration, the support tool 70 b also includes a slide portion 72 that allows the support tool 70 a to be slidable in the longitudinal direction of the steering member base material 91. The slide part 72 is linked to the slide base 73.

  The support base 71 hits a support column that supports the steering member base material 91, and is connected to the gripping portion 74 on the side surface that grips the steering member base material 91. Further, in the support tool 70a, the lower part of the support base 71 is fixed to the apparatus 100, and the lower part of the support base 71 in the support tool 70b is connected to the slide portion 72. In this embodiment, the support base 71 is composed of a single member and has a predetermined height. However, the support base 71 may be composed of, for example, two or more members and provided with a height adjustment mechanism. Good. Further, as shown in FIG. 3A, the support base 71 is connected to a gripping portion 74 via a rotary shaft 83, and the support base 71 includes a rotation mechanism having a motor and a gear pair. By providing the rotation mechanism on the support base 71, the gripping portion 74 can rotate around the rotation shaft 83 while gripping the steering member base material 91.

  The slide part 72 cooperates with the slide base 73 to enable the support tool 70 b to move in the longitudinal direction of the steering member base material 91. Although the slide part 72 and the slide base 73 are configured to be movable by providing a gear pair, the present invention is not limited to this.

  The clampers 75 and 76 are configured to hold the steering member base material 91 at both ends. In the present embodiment, rotating shafts 81 and 82 are provided on a part of the power unit 77, and the rotating shafts 81 and 82 are clamped to the clampers. 75 and 76 are rotatably attached.

  The power unit 77 includes a motor for operating the clampers 75 and 76 and a rotation mechanism for the clampers 75 and 76 such as a gear pair. By grasping the steering member 90 and releasing the grip, the clampers 75 and 76 are rotated around the rotation shafts 81 and 82 and the opening angle formed by the clampers 75 and 76 is adjusted.

  The positioning pins 78 and 79 are provided on the outer surface of the power unit 77. Positioning holes for inserting positioning pins 78 and 79 are provided in the side brackets 92 and 93 disposed at both ends in the longitudinal direction of the steering member 90. By inserting the positioning holes of the side brackets 92 and 93 into the positioning pins 78 and 79, the side brackets 92 and 93 are attached to the positioners 70a and 70b and positioned. After the side brackets 92 and 93 are joined to the steering member base material 91 in a state of being inserted into the positioning pins 78 and 79 of the support members 70a and 70b, the side brackets 92 and 93 are gripped by the clampers 75 and 76 to be steered. The member 90 is supported.

  The locators 10a and 10b include a first slide portion 11, a second slide portion 12, a placement portion 13, a rod 14, a movable contact portion 15, a support base 17, an arm 18, and an advance / retreat portion 19, respectively. Have.

  The first slide portion 11 is configured to be movable by providing a configuration such as a roller with respect to the slide base 73 so as to move the locators 10a and 10b to predetermined positions in the longitudinal direction of the steering member base material 91. . The second slide part 12 is attached to the upper part of the first slide part 11. The second slide portion 12 can be moved in a direction intersecting the longitudinal direction of the steering member base material 91 with a roller or the like so as to approach or separate from the steering member base material 91 in a direction orthogonal to the steering member base material 91. It is configured.

  The mounting portion 13 includes a contact portion 13a and a support portion 13b. The contact portion 13a is provided at two locations so as to come into contact with the steering member base material 91 from below and is supported by the support portion 13b. In the present embodiment, the contact portion 13a is configured to make point contact with the steering member base material 91 at two locations in the cross section, but may be configured to make surface contact.

  The support portion 13b is a member that supports the contact portion 13a that contacts the steering member base material 91 at two locations. The support portion 13b has a shape such that the cross section is opened in one direction so that the abutment portion 13a abuts from two locations below the steering member base material 91, but is not limited thereto.

  The rod 14 is connected to the support portion 13b at the upper portion and is connected to the second slide portion 12 at the lower portion. The rod 14 is configured so that the height from the second slide portion 12 can be adjusted. Therefore, when the steering member base material 91 is gripped, the heights of the support portions 70a, 70b and the contact portion 13a are aligned, and conversely, when the grip is released, the support members 70a, 70b are in contact with the support members 70a, 70b. The height of the rod 14 can be changed to move the portion 13a downward.

  The movable contact portion 15 approaches and separates from the steering member base material 91 from a direction different from the place where the mounting portion 13 contacts the steering member base material 91 in the circumferential direction. The movable contact portion 15 is rotatably attached to the support base 17, rotates around the support point p <b> 2, and contacts or separates from the steering member base material 91 from above. The movable contact portion 15 is rotatably connected to the arm 18 at the end opposite to the contact portion 16. As the arm 18 moves in the direction of the arrow d1 or d2 shown in FIG. 5B, the movable contact portion 15 rotates from the support point p2. Although the contact part 16 with the steering member base material 91 is formed in a circular shape in FIG. 5B and the like, it is not limited to this. The support base 17 is installed on the second slide part 12, and the movable contact part 15 is attached to the upper part by a pin or the like.

  The advancing / retreating portion 19 has a configuration for moving the arm 18 to the arrow d1 or d2 shown in FIG. The advancing / retreating portion 19 has a gear driven by a motor or the like inside, and moves in the direction indicated by the arrow d1 or d2 by forming teeth meshing with the gear at the end of the arm 18 on the advancing / retreating portion 19 side. The specific configuration for moving is not limited to this.

  The steering member base material 91 may be contracted and deformed during welding to be softened, which may make it difficult for the hand robot 30 to grip. Even in such a case, the locator 10a or the locator 10b grips the steering member base material 91, thereby preventing the steering member base material 91 from being deformed during welding and facilitating gripping by the hand robot 30. be able to.

  Further, gripping by the locator 10 a or the locator 10 b is performed between a portion where welding is performed by the welding robot 40 and a portion where the steering member 80 is gripped by the hand robot 30. In this way, by gripping the steering member base material 91 with the locator 10a or the locator 10b interposed between the welding location and the location where the hand robot 30 is gripped, the heat generated during welding is not transmitted to the location to be gripped. Or it can be made difficult to transmit, and it can be made easy to hold by the hand robot 30.

  As shown in FIGS. 6A and 6B, the steering member 90 includes an elongated steering member base material 91, side brackets 92 and 93, audio brackets 94 and 95, bracket impact 96, and an instrument stay 97. And a bracket airbag 98. The side brackets 92 and 93 are attached to both ends of the steering member base material 91. The audio brackets 94 and 95 are joined substantially symmetrically near the center of the steering member base material 91.

  The bracket impact 96 and the instrument stay 97 are joined between the audio bracket 93 and the side bracket 92 as shown in FIG. The bracket airbag 98 is joined between the audio bracket 95 and the side bracket 93.

  The center-of-gravity position b is a position (balance point) on the steering member base material 91 at which the steering member 90 can be conveyed while maintaining a substantially horizontal state without losing balance when the steering member 90 is gripped by the hand robot 30. . The center-of-gravity position b is calculated by the control unit 50 according to the shape and weight of each component 92 to 98 and the joining position in the steering member base material 91. In the present embodiment, the position of the center of gravity (balance point) corresponds to the approximate center of the steering member base material 91.

  Next, a method for joining the components of the steering member will be described among the methods for manufacturing the steering member according to the present embodiment. 7 to 11 are views for explaining a welding process in manufacturing the steering member according to the present embodiment, and FIGS. 12 and 13 are views for explaining a conveying process in manufacturing the steering member. The method for manufacturing a welded part according to the present embodiment includes a welding process corresponding to a joining process and a conveying process.

  First, in the welding process, the hand robot 30 grips the side bracket 92, conveys it to the fixed side support 70a, inserts the positioning holes of the side bracket 92 into the positioning pins 78 and 79, and as shown in FIG. 75 and 76 are rotated and gripped by the fixed support tool 70a. In FIG. 7, the welding robot 40 is not shown for convenience.

  Next, in order to move the locators 10 a and 10 b to the position where the steering member base material 91 is disposed, the second slide portion 12 is operated to approach the slide base 73. Then, the movable contact portion 15 is rotated upward so that the steering member base material 91 can be placed on the placement portion 13. Then, the hand robot 30 grips the steering member base material 91 from the component table 60 and places it on the placement part 13 of the locators 10a and 10b so that the end part is in contact with the side bracket 92. When the placement is completed, the movable contact portion 15 is operated, and the steering member base material 91 is gripped by the placement portion 13 and the movable contact portion 15 as shown in FIG.

  Next, as shown in FIG. 9, the welding torch 41 of the welding robot 40 is moved to the contact position between the side bracket 92 and the steering member base material 91 and welded to join the two.

  Next, the hand robot 30 grips the side bracket 93 to approach the support tool 70b, and the positioning holes are inserted into the positioning pins 78 and 79. Then, the clampers 75 and 76 are rotated and gripped by the support tool 70b. When the side bracket 93 is gripped by the support tool 70b, the support tool 70b is moved toward the support tool 70a, and the side bracket 93 is brought into contact with the end portion of the steering member base material 91. Weld by 40. Thus, the steering member base material 91 can be supported by the support tools 70a and 70b, and the gripping of the steering member base material 91 by the locators 10a and 10b can be released. When gripping by the support tools 70a and 70b is completed, the second slide portion 12 of the locator 10b is operated to move away from the slide base 73 as shown in FIG.

  Next, another component (for example, audio bracket) 94 to be joined to the steering member base material 91 is joined. When joining, the audio robot 94 is gripped by the hand robot 30 and positioned at a predetermined position taught on the steering member base material 91.

  Next, the locator 10 a is operated and moved between the joining position of the component 94 and the gripping position of the steering member base material 91 by the hand robot 30. When the locator 10a is moved to the position, the steering member base material 91 is gripped by the locator 10a.

  When gripping by the locator 10a is finished, the welding robot 40 is moved to the vicinity of the contact portion between the component 94 and the steering member base material 91 as shown in FIG. When the welding of the component 94 is completed, the components 95 to 98 are also gripped, positioned, moved and gripped by the locator, and welded in the same manner as the component 94.

  When all of the parts 92 to 98 are joined to the steering member base material 91, the hand robot 30 is positioned on the steering member base material 91 on the steering member base material 91 and grips the steering member 90 as shown in FIG. Grab the position where it hits. When the hand robot 30 grips the steering member 90, the support tool 70b releases the grip by the clampers 75 and 76 and moves along the longitudinal direction so as to move away from the support tool 70a.

  When the support member 70b can move to a position where it does not collide with the side bracket 93, the steering member 90 is moved in the longitudinal direction by the hand robot 30 as shown in FIG. 13, and the side bracket 92 by the clampers 75, 76 of the support member 70a. Is released and conveyed from the welding apparatus 100 to the next process location.

  Next, functions and effects according to the present embodiment will be described. When a part is welded and transported to a long member such as a steering member, the vicinity of the joint is softened by the heat generated during welding, making it difficult to grip, and the heat from welding is reduced. If it is held and transported after waiting, the tact time becomes longer. In addition, since the steering member is a long member, the balance is lost if the place where the steering member is gripped is poor, and the steering member cannot be quickly conveyed.

  On the other hand, in the method for manufacturing a steering member according to the present embodiment, the part to be joined to the steering member base material 91 in the welding process is on the steering member base material 91 and is located at the center of gravity position b on the steering member base material 91. The steering member base material 91 and the component are joined at a place other than, and the position corresponding to the center of gravity position b of the steering member is gripped and transported during the transporting process. Therefore, when the steering member is gripped after welding, the portion to be gripped is different from the portion to be welded, and it is difficult for the member to be softened by welding, so that the steering member 90 can be easily gripped and transported. Further, since the gripping position is the center of gravity position b when the steering member 90 is gripped, the steering member 90 can be gripped in a well-balanced manner and quickly transferred to the next process location.

  When the component manufactured by the method according to this embodiment is a steering member, the handle of the automobile is disposed on either the right side or the left side of the vehicle, and components 92 to 98 joined to the steering member base material 91 are handles. Easy to gather in the vicinity. For these reasons, parts are often not joined near the center of the steering member base material 91. Further, since the center of gravity of the steering member 90 is often near the center, parts are not welded, and welding is performed by gripping the vicinity of the center of the steering member base material 91 that is the center of gravity position b of the steering member 90. The rear steering member 90 can be easily gripped and quickly conveyed to the next process location without breaking the balance.

  Further, in the joining process, the locator 10a or locator 10b provided with the mounting portion 13 is disposed between the center of gravity position b and the joining position of the steering member base material 91 and the parts 92 to 98 to provide a steering member base. The material 91 is configured to be gripped. Therefore, it is possible to make it difficult for heat generated during welding to be transmitted to the place where the hand robot 30 is gripped, and to further prevent the steering member base material 91 from being deformed at the gripped part, thereby further facilitating transport by the hand robot 30. be able to.

  Further, in the joining step, the components 92 to 98 are arranged on the mounting portion 13, and the steering is performed from a direction different from the place where the mounting portion 13 contacts the steering member base material 91 in the circumferential direction in the cross section of the steering member base material 91. The component 92 to the component 98 are joined in a state in which the movable member 15 that can be moved toward and away from the member base material 91 is brought into contact with the steering member base material 91 and the steering member base material 91 is held. ing.

  Therefore, the shape of the steering member base material 91 can be further prevented from being deformed by welding by being held by the locators 10a and 10b. Therefore, the accuracy of the shape of the steering member 90 can be improved, and the gripping by the hand robot 40 can be further facilitated.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims.

  Although the embodiment in which the welding of the parts 92 to 98 to the steering member base material 91 is performed by arc welding by the welding robot 40 has been described, the invention is not limited thereto. For welding to the steering member base material 91, other welding methods such as laser welding may be used. In the above description, the locator 10a is disposed between the welding location and the gripping position and held. However, the locator 10b may be used to hold the locator 10a according to the position in the longitudinal direction.

10a, 10b locator (holding member),
100 Welding parts manufacturing equipment,
11 First slide part,
12 Second slide part,
13 Placement part,
13a contact part,
13b support part,
14 rods,
15 movable contact part,
16 contact part,
17 Support base,
18 arms,
19 Advancement / Retreat Department,
30 hand robot,
31 hands,
32 The first camera,
33 Second camera,
40 welding robot,
41 welding torch,
42 Third camera,
50 control unit,
60 parts table,
70a fixed support,
70b moving support,
71 support base,
72 slide part,
73 slide base,
74 gripping part,
75, 76 clamper,
77 Power section,
78, 79 locating pins,
81, 82 rotation axis,
90 Steering member (welded part),
91 Steering member base material,
92, 93 parts (side bracket),
94,95 parts (audio bracket),
96 parts (bracket impact),
97 parts (instrument),
98 parts (bracket airbag),
b Center of gravity position
d1, d2 direction of movement of arm 18,
p1 The connection point between the arm 18 and the movable contact portion 15,
p2 Rotation fulcrum of arm 18.

Claims (4)

A method for manufacturing a welded part that forms a welded part by welding a second work to a long first work,
A joining step in which the first workpiece and the second workpiece are brought into contact with each other at a predetermined portion, and the contact portion is joined by welding;
A conveying step of grasping and conveying the welded parts that have been joined,
In the joining step, the first work and the second work are joined at a location on the first work and excluding the position of the center of gravity of the welded part,
The method for manufacturing a welded part, wherein the center of gravity of the welded part on the first workpiece is gripped in the conveying step. In the joining step, joining with the second workpiece is performed in a state where the first workpiece is held by a holding member having a placement portion for placing the first workpiece.
2. The welding according to claim 1, wherein in the joining step, the holding member is disposed between the position of the center of gravity of the welded part and the joining position of the first work and the second work to grip the first work. Manufacturing method of parts.   In the joining step, the holding member places the first workpiece on the placement portion, and the circumferential direction of the first workpiece from a direction different from a location where the placement portion contacts the first workpiece. The welded part according to claim 2, wherein a movable abutting portion capable of approaching and separating toward the first work is brought into contact with the first work to join the second work in a state where the first work is held. Manufacturing method. The first work is a long bar-shaped member used for a steering member of an automobile,
The method for manufacturing a welded part according to any one of claims 1 to 3, wherein in the transporting step, a central portion in the longitudinal direction of the rod-shaped member is gripped.