JP2004074261A - Welding tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce effect of thermal deformation caused by welding and to inhibit production of cracks, in welding the fuel tank of a motorcycle. <P>SOLUTION: The outer panel 14 of a fuel tank 12 is held by a plurality of attachments 24 with springs 64. The inner panel 16 is positioned by an inner tool 20. The attachments 24 are fixed to clamp arms 26 that open and close by cylinders 28. The outer panel 14 and the inner panel 16 are welded in the superposed part and thermal deformation by welding is absorbed by the springs 64, thus causing no strain in the weld zone. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a welding jig for welding a fuel tank of a motorcycle, and more particularly to a welding jig for reducing the influence of thermal distortion due to welding.
[0002]
[Prior art]
As shown in FIG. 12, the bottom of an outer plate 202 and an inner plate 204 is generally welded to a fuel tank 200 of a motorcycle. The ends of the outer plate 202 and the inner plate 204 are each bent downward to form a flange 206, and the flange 206 is generally seam-welded.
[0003]
Among motorcycles, in which the handlebars are high and the occupant operates with the upper body substantially upright, that is, a so-called American type motorcycle, the aesthetic appearance of the fuel tank 200 is particularly important. . In the fuel tank 200 requiring such aesthetic appearance, it is not preferable that the welded flange portion 206 is exposed. In addition, the center of gravity of the fuel tank is shifted upward by the height of the flange portion 206, which is inconvenient in lowering the center of gravity of the motorcycle.
[0004]
Furthermore, the presence of the flange portion 206 limits the oil storage capacity of the fuel tank 200.
[0005]
As a fuel tank having a structure in which the flange portion does not extend downward by seam welding, a technique has been proposed in which the flange portion is bent inward of the vehicle body (for example, see Japanese Patent Application Laid-Open No. 10-67985). However, in this technique, there is a useless space above the flange portion, and the capacity of the fuel tank is limited.
[0006]
[Problems to be solved by the invention]
In order to manufacture a fuel tank having a structure without a flange, a skilled welder needs to perform welding by arc welding or the like. When performing automatic welding using a robot, since the fuel tank, which is a work, is firmly fixed, there is no escape for thermal distortion, so that cracks are likely to occur and the yield is poor. If a crack occurs, it must be repaired by a skilled welder.
[0007]
The present invention has been made in consideration of such problems, and when welding a fuel tank of a motorcycle, a welding method that can reduce the influence of thermal distortion due to welding and suppress the occurrence of cracks. The purpose is to provide a jig.
[0008]
[Means for Solving the Problems]
A welding jig according to the present invention is a welding jig that holds the fuel tank when welding a fuel tank of a motorcycle, and has a plurality of attachments that hold the fuel tank via an elastic body. Features.
[0009]
As described above, by holding the fuel tank via the elastic body, the influence of thermal distortion due to welding can be reduced, and the occurrence of cracks can be suppressed.
[0010]
In this case, the attachment is attached to an arm having an opening / closing mechanism, and the arm is opened to a detachable opening degree when the fuel tank is fully opened, and is positioned by a stopper when fully closed, and the fuel tank is positioned by the attachment. You may make it hold | maintain.
[0011]
With such a configuration, the fuel tank can be easily attached to and detached from the welding jig. In addition, the position of the attachment can be accurately set by the stopper.
[0012]
Further, the attachment may include a pressing force adjusting unit for adjusting a pressing force for holding the fuel tank. The pressing force adjusting section can adjust the pressing force when the attachment comes into contact with the fuel tank and the allowable amount of thermal deformation during welding.
[0013]
Further, an outer jig for supporting an outer plate of the fuel tank, and an inner jig for supporting an inner plate of the fuel tank, wherein the attachment is provided in the outer jig, By holding substantially the side and / or the end of the outer plate, the inner plate and the outer plate of the fuel tank are respectively held and the position is accurately set.
[0014]
The outer plate of the fuel tank has an end narrowed inward, and the attachment overlaps an end outer surface of the outer plate with an end inner surface of the inner plate, or an end of the outer plate. And the end of the inner plate may be held in abutted condition. By holding the outer plate and the inner plate in this manner, the fuel tank can be formed into a shape without a flange portion.
[0015]
Still further, a positioning mechanism may be provided which is inserted into a fuel supply port provided on the upper surface of the fuel tank and contacts and holds the inside of the fuel tank. The fuel tank can be quickly and accurately set with respect to the welding jig by the positioning mechanism.
[0016]
The tip of the attachment that contacts the fuel tank may be provided with a tilting mechanism that can tilt in any direction.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of a welding jig according to the present invention will be described with reference to the accompanying FIGS.
[0018]
As shown in FIG. 1, a welding jig 10 according to the present embodiment is a fixing jig for welding an outer plate 14 and an inner plate 16 of a fuel tank 12 of a motorcycle. And an inner jig 20 for supporting the inner plate 16. 1, the right side in FIG. 1 is the front (handle side) and the left side is the rear (seat side). The fuel tank 12 is placed upside down.
[0019]
As shown in FIG. 1, the outer plate 14 of the fuel tank 12 has a lower portion supported by a plurality of lower support members 22 in a state where the outer plate 14 is placed, and a plurality of attachments 24 on substantially side and substantially end portions. Each attachment 24 is attached to one or two clamp arms (arms) 26. A total of eight clamp arms 26 are provided, four on each of the left and right sides, and each can be individually opened and closed by a cylinder 28.
[0020]
As shown in FIG. 2, the outer jig 18 is provided at the tip of the jig robot 30 and is set at a predetermined position where the welding process is performed. The welding process is performed by the welding robot 32. The jig robot 30, the welding robot 32, the cylinder 28 and the like are controlled by the controller 34.
[0021]
As shown in FIG. 3, the end 15 of the outer plate 14 is narrowed inward, and the inner surface of the end of the inner plate 16 overlaps the outer surface of the end of the outer plate 14. In this state, the contact portion 120 (see FIG. 11), which is the end of the overlap between the outer plate 14 and the inner plate 16, is welded by the welding robot 32 to perform a so-called one-side welding of a fillet joint.
[0022]
An oil supply port 36 is provided at a lower portion of the outer plate 14.
[0023]
As shown in FIG. 4, the outer jig 18 includes two vertical frames 38 extending substantially from the lower side of the oil supply port 36 to the rear at a substantially constant interval with the lower surface of the outer plate 14. And four auxiliary frames 40 on each of the left and right sides extending laterally, obliquely forward and obliquely rearward. A plurality of lower support members 22 for supporting the outer plate 14 from below are provided on the upper surface of the auxiliary frame 40. At the rear end of the vertical frame 38, a rear end support member 42 that supports the rear end side of the outer plate 14 is provided. For the lower support member 22 and the rear end support member 42, a resin material such as nylon may be used.
[0024]
At the front ends of the two vertical frames 38, a positioning mechanism 44 inserted into the fuel filler port 36 and holding the fuel tank 12 from the inside is provided.
[0025]
As shown in FIG. 5, a base plate 46 and a cylinder 28 for opening and closing the clamp arm 26 are provided at each end of the auxiliary frame 40, and the base plate 46 and the cylinder 28 are opened and closed by an opening and closing mechanism 47. Is composed. The cylinder 28 is swingable with a part of the cylinder tube 28 a pivotally supported by a base plate 46. The cylinder 28 opens and closes the clamp arm 26 by extending and retracting the rod 28b.
[0026]
The lower part of the clamp arm 26 is pivotally supported by a shaft 46a on the upper part of the base plate 46 and can swing. At the lower part of the clamp arm 26, a projecting portion 26a slightly protruding outward is provided, and this projecting portion 26a is pivotally supported by the tip of a rod 28b of the cylinder 28. At the lower part of the clamp arm 26, a stopper 26b slightly protruding inward is provided. The stopper 26b comes into contact with the upper surface of the base plate 46 when the clamp arm 26 is closed, so that the position of the clamp arm 26 is determined.
[0027]
When the clamp arm 26 is closed by the opening / closing mechanism 47, a first arm 26c extending upward from the shaft 46a and a first arm 26c provided at the distal end of the first arm 26c and inclined slightly inward are provided. It has a two-arm part 26d and a third arm part 26e provided at the tip of the second arm part 26d and inclined further inward than the second arm part 26d. With such a configuration, when the clamp arm 26 is closed, the distance between the clamp arm and the outer plate 14 becomes substantially constant. In addition, the installation of the third arm portion 26e is omitted depending on the setting location.
[0028]
The first arm portion 26c, the second arm portion 26d, and the third arm portion 26e are each provided with a hole 48 to which the attachment 24 can be attached, and two or three attachments 24 are attached to each clamp arm 26. ing.
[0029]
As shown in FIG. 6, the attachment 24 is provided at a distal end of the attachment shaft 54, a cylinder 50 attached to the hole 48 of the clamp arm 26, an attachment shaft 54 movable along a center hole 52 of the cylinder 50. A spring receiving plate 56, an adjusting nut 60 (pressing force adjusting portion) screwed into a screw groove 58 provided on the outer peripheral surface of the distal end portion of the cylindrical body 50, a washer 62 adapted to the adjusting nut 60, and a spring receiving plate. (Elastic body) 64 provided between the spring and the washer 62.
[0030]
At the tip of the spring receiving plate 56, a spherical ball 66 and a contact portion (tilt mechanism) 68 that can tilt in an arbitrary direction while sliding with respect to the ball 66 are provided. The contact part 68 is composed of two parts 68a and 68b and sandwiches a ball (tilting mechanism) 66.
[0031]
A fixing nut 72 is screwed into a screw groove 70 provided on the outer peripheral surface of the rear end of the cylindrical body 50, and the clamp arm 26 is sandwiched and fixed between the annular projection 74 substantially at the center of the cylindrical body 50 and the fixing nut 72. . Between the annular projection 74 and the clamp arm 26, one or more annular shims 76 for adjusting the projection length of the attachment 24 with respect to the clamp arm 26 are inserted as necessary.
[0032]
A cylindrical bush 78 having a lubricating function is inserted into the inner surface of the cylindrical body 50. The attachment shaft 54 slides on the bush 78 and can move smoothly.
[0033]
At the rear of the attachment shaft 54, a slightly thin screw portion 80 is provided, and a knob 82 (pressing force adjusting portion) and an end stopper 84 (pressing force adjusting portion) are screwed to the screw portion 80. By turning the knob 82 and the end stopper 84, the amount of compression of the spring 64 and the amount of protrusion of the attachment shaft 54 can be adjusted. After this adjustment, the knob 82 and the end stopper 84 are tightened by a double nut function. Fixed.
[0034]
Further, the amount of compression of the spring 64 can be adjusted by turning the adjustment nut 60. That is, the amount of compression of the spring 64 can be adjusted by the knob 82, the end stopper 84, and the adjustment nut 60. Actually, it is preferable that the coarse adjustment is performed by the knob 82 and the end stopper 84, and the fine adjustment is performed by the adjustment nut 60.
[0035]
Further, when the tip of the contact portion 68 is pushed by the outer plate 14, the attachment shaft 54 moves toward the rear end. At this time, the attachment shaft 54 compresses the spring 64 and moves a distance corresponding to this resilient force.
[0036]
As shown in FIG. 7, the positioning mechanism 44 is provided below the oil supply port 36 at an intermediate portion between the two vertical frames 38. The upper part of the positioning mechanism 44 is inserted into the fuel supply port 36. The positioning mechanism 44 includes an insertion member 88 fixed to the frame 86, a moving member 92 that moves up and down by a rod 90, and is pivotally supported by the moving member 92, and tilts slightly outward when the moving member 92 descends. And two hooks 94 to be connected. The width D of the insertion member 88 is set to be slightly smaller than the inner diameter of the fuel supply port 36.
[0037]
The two hooks 94 are plates extending upward, and are respectively set symmetrically. The hook 94 has a protruding portion 94a whose upper portion protrudes slightly outward, a long hole 94b long in the longitudinal direction, and a lower swing hole 94c. The lower part of the long hole 94b is slightly bent outward.
[0038]
At the approximate center height of the insertion member 88, two left-right symmetric fixed support shafts 88a protrude. At the upper part of the moving member 92, two symmetrical moving support shafts 92a protrude. The fixed support shaft 88a and the movable support shaft 92a protrude toward the near side in the drawing of FIG. 7, the fixed support shaft 88a is inserted into the elongated hole 94b of the hook 94, and the movable support shaft 92a is connected to the swing hole 94c of the hook 94. Is fitted.
[0039]
When the outer plate 14 is placed on the outer jig 18, the rod 90 is moved upward by a cylinder (not shown). At this time, the two hooks 94 are inclined inward and fit within the width D of the insertion member 88. When the outer plate 14 is placed on the outer jig 18, the upper part of the insertion member 88 and the upper part of the hook 94 are inserted into the fuel filler port 36.
[0040]
As shown in FIG. 8, when the rod 90 is lowered, the moving member 92 and the hook 94 are also lowered. The hook 94 is guided by a fixed support shaft 88a inserted into the elongated hole 94b, and is inclined outward. The protruding portion 94a of the hook 94 extends beyond the inner diameter of the fuel filler port 36, and further descends to contact the end of the fuel filler port 36 to hold the outer plate 14.
[0041]
As shown in FIG. 9, the inner jig 20 includes a long upper plate 100, an extension bar 102 protruding from a rear end of the upper plate 100, a handle 104 provided on the upper surface of the upper plate 100, It has a plurality of nylon holding plates 106 fixed to the lower surface of the upper plate 100 and adapted to the shape of the inner plate 16. A connecting lever 108 is provided at the rear end of the extension bar 102 and the frontmost holding plate 106a. Each holding plate 106 has a left-right symmetrical shape projecting around the upper plate, and the right and left end surfaces or the lower surface match the shape of the inner plate 16. The connection lever 108 is engaged with connection hooks 110 (see FIG. 1) provided before and after the outer jig 18.
[0042]
Next, a method of welding the outer plate 14 and the inner plate 16 of the fuel tank 12 of the motorcycle using the welding jig 10 configured as described above will be described.
[0043]
First, the clamp arm 26 of the outer jig 18 is left open (see FIG. 5), and the outer plate 14 of the fuel tank 12 is placed on the lower support member 22 with the filler port 36 facing down. I do. At this time, the insertion member 88 of the positioning mechanism 44 is inserted into the filler port 36, and the outer plate 14 is placed. By displacing the hook 94 upward, the width of the hook 94 is set to be smaller than the inner diameter of the filler port 36, so that the hook 94 and the filler port 36 do not interfere with each other. Further, since the width D of the insertion member 88 is set to be slightly smaller than the inner diameter of the oil filler 36, the position of the outer plate 14 with respect to the outer jig 18 can be simplified by inserting the upper part of the insertion member 88 into the oil filler 36. And it can be set accurately.
[0044]
Next, the moving member 92 and the two hooks 94 are lowered by lowering the rod 90 of the positioning mechanism 44. The two hooks 94 incline outward as they descend, and the protruding portion 94a abuts on the end of the filler port 36. Thereby, the outer plate 14 is firmly fixed to the outer jig 18.
[0045]
Next, the inner plate 16 of the fuel tank 12 is placed on the upper portion of the outer plate 14. At this time, the outer plate 14 is placed such that the inwardly narrowed end 15 of the outer plate 14 and the peripheral edge of the inner plate 16 substantially overlap with each other. Thereafter, the inner jig 20 is placed on the upper portion of the inner plate 16.
[0046]
Next, the clamp arm 26 is closed by urging each of the eight cylinders 28, and the stopper 26b is brought into contact with the upper surface of the base plate 46. The position of the clamp arm 26 is determined by the stopper 26b. When the clamp arm 26 is closed, the contact portion 68, which is the tip of each attachment 24, contacts the outer plate 14. At this time, the contact portion 68 contacts the outer plate 14 while appropriately compressing the spring 64, so that the outer plate 14 is pressed according to the amount of compression of the spring 64. This pressing force can be adjusted by rotating the adjustment nut 60 or the knob 82, and it is preferable to adjust the pressing force in advance so as to have an appropriate pressing force.
[0047]
Since the position of the outer plate 14 is set by the contact portion 68 of the attachment 24 holding the outer plate 14, for example, the bending of the outer plate 14 due to its own weight can be corrected. In addition, since the eight clamp arms 26 are symmetrically arranged four by four, the fuel tank 12 can be held in a well-balanced manner.
[0048]
In addition, since the contact portion 68 has a structure that can be tilted with the ball 66 as a reference, the contact surface surely contacts the outer surface without one-sided contact.
[0049]
Next, the connection levers 108 provided at both ends of the inner jig 20 are engaged with the connection hooks 110. Since the pressing plate 106 of the inner jig 20 has a shape adapted to the inner plate 16, the inner plate 16 is accurately positioned and fixed to the outer plate 14.
[0050]
Next, the outer plate 14 and the inner plate 16 are welded by a welding robot 32 (see FIG. 2). Various welding methods such as TIG (inert-gas tungsten-arc welding) welding, MIG (inert-gas metal-arc welding) welding, and laser welding can be employed.
[0051]
As shown by points Q1 to Q12 representing the welding order in FIG. That is, the welding is started from the foremost point Q1 on the center line of the fuel tank 12, and the welding is sequentially performed to the points Q2 to Q6. The point Q6 is on the center line of the fuel tank 12 and is the rearmost point. After the welding is performed up to the point Q6, the welding is interrupted once and the operation moves to the point Q7. The point Q7 is a point near the point Q1, and is set at a position where a lap weld is formed. Welding is started again from point Q7, and welding is sequentially performed to points Q7 to Q12. The point Q12 is a point near the point Q7, and is set at a position where a lap weld is formed. The welding of such a path is performed by the operation of the welding robot 32 (see FIG. 2), but the welding may be performed while the jig robot 30 (see FIG. 2) cooperates. Note that points Q2 to Q6 and points Q7 to Q11 are points for convenience of explanation, and for example, no special processing such as stopping welding or changing the welding method is performed at point Q2 or the like.
[0052]
As shown in FIG. 11, welding is performed by moving the electrode 122 (or arc or the like) along the contact portion 120 between the end of the inner plate 16 and the outer plate 14. A welding bead 124 is formed in the contact portion 120, and the inner plate 16 and the outer plate 14 are welded.
[0053]
By the way, since the welded portion at the time of welding becomes hot and melts, deformation accompanying the melting occurs. In particular, when the workpiece is in a constrained state, when the molten portion is cooled and solidified, a weld bead 124 having deformation (thermal strain) inside without being allowed to deform is formed. The weld bead 124 having such thermal distortion may cause cracks.
[0054]
In the welding using the welding jig 10, when the weld bead 124 is formed by heat and the welded portion expands, the outer plate 14 is deformed so as to be pushed outward as indicated by an arrow A0. I do. At this time, the contact point P, which is in contact with the contact portion 68 of the attachment 24, receives the force A1 according to the arrow A0. The force A1 is determined by the direction and size of the arrow A0 and the position of the welding point P, and is a force that is directed substantially outward. The welding point P compresses the spring 64 via the contact portion 68 by the force A1. When the force A1 is small, the compression amount of the spring 64 is small, and when the force A1 is large, the compression amount of the spring 64 is large.
[0055]
In this way, the initial contact point P can be displaced to the position Px where the resilient force due to the compression of the spring 64 and the force A1 are balanced. Therefore, at the time of high temperature after welding, the weld bead 124 condenses while absorbing thermal strain by the action of the attachment 24, and the thermal strain contained in the weld bead 124 after cooling becomes very small.
[0056]
Further, since the distance between the contact point P and the position Px is very small, this distance does not cause any inconvenience as a dimensional error.
[0057]
In FIG. 11, an arrow A0 indicating the direction in which the welding bead 124 expands is illustrated as a direction substantially coinciding with the direction of the end face of the outer plate 14, but the direction of the arrow A0 may be any direction. It can absorb thermal strain. That is, when the arrow A0 faces outward, the spring 64 of the attachment 24 is compressed in accordance with the direction and the size, and the thermal distortion can be absorbed.
[0058]
When the arrow A0 points inward, the weld bead 124 is formed while contracting, and the attachment 24 does not restrict the contraction deformation.
[0059]
After the welding is performed up to the point Q12, which is the end point of the welding, the connecting lever 108 is released, the inner jig 20 is removed, and the rod 28b of the cylinder 28 is contracted to open the clamp arm 26. Further, the rod 90 of the positioning mechanism 44 is raised, and the fuel tank 12 is removed.
[0060]
As described above, by performing welding using the welding jig 10 according to the present embodiment, the spring of the attachment 24 absorbs deformation due to thermal distortion of the weld bead 124 during welding and at a high temperature after welding. The weld bead 124 after cooling contains almost no thermal distortion. Therefore, generation of cracks in the weld bead 124 can be suppressed, and the yield can be improved.
[0061]
Further, the attachment 24 can be opened and closed by the clamp arm 26, so that the fuel tank 12, which is a work, can be easily attached and detached. The position of the clamp arm 26 is accurately determined by the stopper 26b.
[0062]
Furthermore, the force with which the contact portion, which is the tip of the attachment 24, presses the outer plate 14 can be adjusted by the adjustment nut 60 and the knob 82.
[0063]
Furthermore, since the outer jig 18 is provided with the positioning mechanism 44 that is inserted into and fixed to the fuel supply port 36 of the fuel tank 12, the positioning of the fuel tank 12 with respect to the outer jig 18 can be performed quickly and accurately. Can be. The position of the inner plate 16 of the fuel tank 12 can be accurately adjusted with respect to the outer plate 14 by the inner jig 20.
[0064]
In addition, the attachment 24 performs welding while holding the outer surface of the end portion 15 of the outer plate 14 and the inner surface of the end portion of the inner plate 16 in a state of being overlapped with each other. There is no. Therefore, it is suitable as a fuel tank for a motorcycle requiring an aesthetic appearance such as an American type.
[0065]
Although the above-described welding jig 10 has been described as an example having eight clamp arms 26, the number of the clamp arms 26 may be appropriately increased or decreased according to the size and shape of the fuel tank 12. For example, a total of four clamp arms 26, two on each side, may be provided and arranged symmetrically. Further, the number of the attachments 24 attached to one clamp arm 26 may be appropriately increased or decreased according to the size and shape of the fuel tank 12.
[0066]
The welding jig according to the present invention is not limited to the above-described embodiment, but may adopt various configurations without departing from the gist of the present invention.
[0067]
【The invention's effect】
As described above, according to the welding jig of the present invention, when welding a fuel tank of a motorcycle, the effect of thermal distortion due to welding is reduced, and the effect of suppressing the occurrence of cracks is achieved. Can be.
[Brief description of the drawings]
FIG. 1 is a perspective view of a welding jig according to the present embodiment and a fuel tank of a motorcycle.
FIG. 2 is a schematic diagram of a welding system to which the welding jig according to the present embodiment is applied.
FIG. 3 is a front sectional view of a welding jig according to the present embodiment and a fuel tank of a motorcycle.
FIG. 4 is a partially omitted side view of a welding jig according to the present embodiment and a fuel tank of a motorcycle.
FIG. 5 is a front view showing a cylinder, a clamp arm, an attachment, and peripheral portions thereof.
FIG. 6 is a sectional view of an attachment.
FIG. 7 is a front view of the positioning mechanism with the hook raised.
FIG. 8 is a front view of the positioning mechanism with the hook lowered.
FIG. 9 is a perspective view of an inner jig, an inner plate, and an outer plate.
FIG. 10 is a schematic diagram showing a welding path.
FIG. 11 is a schematic view showing a state where welding is performed while pressing an outer plate with an attachment.
FIG. 12 is a perspective view of a fuel tank having a flange portion.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Welding jig 12 ... Fuel tank 14 ... Outer plate 16 ... Inner plate 15 ... End part 18 ... Outer jig 20 ... Inner jig 22 ... Lower support member 24 ... Attachment 26 ... Clamp arm 28 ... Cylinder 30 ... Jig Robot 32 ... Welding robot 34 ... Controller 36 ... Filling port 44 ... Positioning mechanism 50 ... Cylinder 54 ... Attachment shaft 56 ... Spring receiving plate 58 ... Screw groove 60 ... Adjustment nut 62 ... Washer 64 ... Spring 66 ... Ball 68 ... Contact part 82 Knob 84 End stopper 88 Insert member 90 Rod 94 Hook 94a Projecting part 94b Elongated hole 94c Oscillating hole 106, 106a Pressing plate 108 Connection lever 110 Connection hook 120 Contact portion 124 Weld bead

Claims (7)

A welding jig for holding the fuel tank when welding a fuel tank of a motorcycle,
A welding jig comprising a plurality of attachments for holding the fuel tank via an elastic body. The welding jig according to claim 1,
The attachment is attached to an arm having an opening / closing mechanism,
The welding jig characterized in that the arm is opened to a detachable opening when the fuel tank is fully opened, the stopper is positioned when the arm is fully closed, and the fuel tank is held by the attachment. The welding jig according to claim 1 or 2,
The welding jig, wherein the attachment has a pressing force adjusting portion for adjusting a pressing force for holding the fuel tank. The welding jig according to any one of claims 1 to 3,
An outer jig supporting an outer plate of the fuel tank,
An inner jig supporting an inner plate of the fuel tank,
Has,
The welding jig, wherein the attachment is provided on the outer jig, and the attachment holds substantially side and / or substantially end portions of the outer plate. The welding jig according to claim 4,
The outer plate of the fuel tank has an end narrowed inward,
The attachment is characterized in that an end outer surface of an end of the outer plate and an inner surface of an end of the inner plate are overlapped, or an end of the outer plate and an end of the inner plate are held in an abutted state. And welding jig. The welding jig according to any one of claims 1 to 5,
A welding jig having a positioning mechanism that is inserted into a fuel supply port provided on an upper surface of the fuel tank and contacts and holds the inside of the fuel tank. The welding jig according to any one of claims 1 to 6,
A welding jig characterized in that a portion of the attachment that comes into contact with the fuel tank at the tip end has a tilting mechanism that can tilt in an arbitrary direction.

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