JP2756945B2 - Welding jig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding jig suitable for welding a flange to a tip of a square pipe.

[0002]

2. Description of the Related Art Conventionally, there has been no special jig for welding a flange to a tip opening of a square pipe. For this reason, there were various inconveniences in the actual welding operation. The procedure of the welding operation will be described below with reference to FIGS. As shown in FIG. 10, the flange 2 is welded to the square pipe 1, and at this time, the overlay 3 is formed on the corner formed by the square pipe 1 and the flange 2. However, the square pipe 1 has a groove 4 at its tip as shown in FIG.
The fixing plate frame 5 is fixed to the opening of the end of the square pipe 1 in which is formed, and the end of the fixing plate frame 5 is projected from the opening. The flange 2 comes into contact with the projecting surface of the plate frame 5.

[0003] A groove 6 having the contact plate frame 5 as a bottom surface is formed between the flange 2 and the groove 4 by the above-described operation. The part 3 is formed. Then, as a specific welding procedure, as shown in FIG. 12, first, the first overlay portion 3a is formed on the upward surface which is one side of the square pipe 1. After forming the first built-up portion 3a, next, for example, the square pipe 1 is rotated 90 degrees in the direction of the arrow in the drawing to turn the unprocessed surface upward. Then, the overlay 3b is formed on the untreated surface in the same manner as described above. In this way, the square pipe 1 is sequentially rotated so that the untreated surface faces upward, and the overlay portions 3a to 3d are formed on the upward untreated surface.

The reason why the unprocessed surface is always upward as described above is as follows. For example, the overlay 3
Is formed, the melted build-up portion 3 flows down and cannot be sufficiently welded. In that sense, as shown in FIG. 12, the corner portions 7 of the build-up portions 3 adjacent to each other have sufficient build-up portions 3.
Is difficult to form. Because this corner 7
As long as the adjacent overlay is not formed, always use square pipe 1
Because it is located on the vertical plane. As described above, according to the conventional method, a sufficient overlay portion is not formed at the corner portion 7 formed by the overlay portions 3 adjacent to each other. for that reason,
After the cladding portions 3 are formed on all four surfaces of the square pipe 1, only the corner portions 7 are separately post-processed so that the cladding portions are formed at the corner portions 7.

[0005]

According to the conventional method as described above, since the corner 7 is filled by post-processing, there are the following problems. First, the overlay on the horizontal surface of the square pipe and the overlay on the corner 7 must be formed separately. In this case, the square pipe is rotated again to turn the corner 7 upward. I have to do it. However, the problem was that the thicker the square pipe, the harder it was to rotate it. In addition, when the two overlaying portions are formed separately, there is a problem that a drooping or unevenness is formed at the joining portion of the overlaying portions, and a middle nest is formed. This is because the temperature conditions at the time of welding are different between the overlaid portion on the horizontal surface and the overlaid portion on the corner portion. This is because, when forming the overlay portion at the corner portion, the welding temperature of the corner portion must be reduced slightly so as not to melt the already formed overlay portion of the horizontal portion.

[0006] However, in order to homogenize both overlay portions, the welding temperature must be as close as possible. That is, at the time of forming the overlaid portion of the corner portion, it is necessary to select a temperature that does not melt the overlaid portion of the horizontal portion and that is closer to the welding temperature of the overlaid portion of the horizontal portion. In order to select such a delicate temperature, it is difficult to adjust, for example, a welding current, and, as a matter of course, there is a problem that the adjustment operation is also troublesome. Further, if the welding temperatures of both overlays are too different, the fusion of the two will not be successful. If the two do not fuse well, for example, if the inspection conditions are strict, the products may be treated as defective. An object of the present invention is to provide a jig that can integrally form a horizontal surface overlay portion and a corner overlay portion.

[0007]

According to a first aspect of the present invention, a groove is formed at an end opening of a square pipe, and an abutment frame is fixed to an inner peripheral surface of the end opening. A groove is formed projecting from the tip end opening, and a flange is made to contact the plate frame to form a groove having the plate frame as a bottom surface.
It is premised on a welding jig for forming a portion and welding a square pipe and a flange. The welding jig is composed of a jig body and a welding tip. The jig body is provided on the back plate that stands upright with respect to the square pipe, and has an angle of approximately 45 degrees. The welding tip comprises a first guide edge that is in close contact with the flange, and a point that is perpendicular to the first guide edge and that is in the groove and contacts the plate frame. And a second guide side which is continuous with the tip side and contacts the groove, and a second guide side which is continuous with the slope side and contacts the square pipe.
The second invention is characterized in that the side plate is movable with respect to the back plate. The third invention is characterized in that the back plate is made extendable. The fourth invention is characterized in that a welding tip is slidably attached to a side plate.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The square pipe used in this embodiment is the same as the conventional square pipe. Therefore, the description of the square pipe 1 in this embodiment uses the same description as the conventional description based on FIG. The jig body j is provided with a back plate 8 and a horizontal plate 9 perpendicular to the back plate 8. The back plate 8
Is designed so that the width of the horizontal plate 9 is longer than the width of the horizontal plane of the square pipe 1 and the back plate 8 stands upright at right angles to the horizontal plane when the horizontal plate 9 is placed on the horizontal plane of the square pipe 1. A pair of side plates 1 is provided on both sides of the back plate 8 as described above.
0 and 11 are fixed. Moreover, the pair of side plates 1
0 and 11 are inclined in opposite directions to each other while maintaining an angle of approximately 45 degrees with respect to the back plate 8. The interval between the narrowest portions, which are the lower portions of the side plates 10 and 11, is approximately equal to the width of the square pipe 1.

On the other hand, as shown in FIG. 5, a welding tip t to be used along the side plates 10 and 11 of the jig body j has a first guide side 12 contacting the flange 2 and a first guide side. A pointed edge 13 perpendicular to 12, a sloping side 14 continuing to the pointed side 13 and contacting the groove 4, a continuation to the sloping side 14 and contacting the square pipe 1 The welding tip t as described above, which includes the second guide side 15, has its pointed edge 13 exactly coincident with the groove 6 formed between the square pipe 1 and the flange 2. Further, the inclined side 14 is made to coincide with the groove 4 of the square pipe 1. Next, a welding method using the above jig will be described. First, the jig body j is placed on the horizontal surface of the square pipe 1 as shown in FIG. When the jig main body j is put in this way, the side plates 10 and 11 straddle the horizontal plane and are located slightly below the corner portion of the square pipe 1. In this state, the side plates 10, 11
Is brought into contact with the flange 2.

After setting the jig body j as described above, the welding tip t is set next. That is,
With the welding tip t along the side plates 10 and 11, the first
The guide side 12 is brought into close contact with the flange 2. Thereby, the tip side 13 fits into the groove 6 and the inclined side 14 comes into contact with the groove 4 formed in the square pipe 1. In the state where the welding tip t is set as described above,
The corner portion of the square pipe 1 is bisected in the angular direction by the welding tip t. In this state, if the built-up portion 16a is formed in the groove 6, FIG.
As shown in the figure, the overlaid portion 16a is also integrally formed within an angle range of approximately 45 degrees at a location corresponding to the conventional corner portion 7. Next, on the surface opposite to the surface on which the overlay 16a is formed, an overlay 16b is similarly formed (see FIG. 7).

As shown in FIG. 7, if the build-up portions 16a and 16b are formed on the symmetrical surface of the square pipe 1, the surfaces adjacent to these build-up portions 16a and 16b are
a and 16b perform the same function as the jig. Therefore, as shown in FIG. 7, after forming the overlaid portions on both opposite sides, the jig is not used and the remaining overlaid portions 16 are not used.
c and the overlaid portion 16d can be formed. As described above, according to the jig of this embodiment, the overlay portion can be formed simultaneously on the horizontal surface portion of the square pipe 1 and the half portion of the corner. It is not necessary to form the part specially. In other words, since the half of the corner portion can be formed integrally with the horizontal portion, the overlay portion between the horizontal portion and the corner portion can be homogenized. Therefore, it is possible to reliably prevent the occurrence of sagging, unevenness, or a middle nest in this portion. Moreover, the angle of inclination of these joints is 4
Since it can be kept at 5 degrees, the whole is good looking and well-organized. In the past, the welding current was adjusted every time the overlaid portion of each corner portion was formed, but according to this embodiment, this can be omitted.

Further, the conventional operation of rolling a square pipe to form a built-up portion at each corner can be omitted. In particular, in the case of a heavy square pipe,
Rolling it can be a significant amount of hard work, but omitting that hard work can significantly improve work efficiency. In the above embodiment, the respective components of the jig body j are integrally formed. However, for example, the back plate 8 can be made to expand and contract, or the side plates 10 and 11 can be moved in the longitudinal direction of the back plate 8. If it does, it will be able to handle both thick and thin square pipes. The welding tip t is
It is natural to select a material that cannot be welded by nature, and it must be a material that can withstand the welding temperature. And this welding tip t may be attached to the side plates 10 and 11 so as to be movable in the groove 6 direction.
In this case, the loss of the welding tip t can be prevented, and even if the depth of the groove 6 is slightly changed, it can be coped with.

[0013]

According to the first aspect of the invention, since the half of the cladding portion corresponding to the corner of the square pipe can be formed integrally with the horizontal portion, the cladding of the horizontal portion and the corner is made uniform. Can be Therefore, it is possible to reliably prevent the occurrence of sagging, unevenness, or a middle nest in this portion. Moreover,
Since the angle of inclination of these joints can be maintained at 45 degrees, the appearance becomes good and tidy as a whole. In the past, the welding current was adjusted each time the overlay portion at each corner was formed, but this can be omitted. Further, the operation of rolling the square pipe to form the overlay portion at each corner can be omitted. In particular, in the case of a heavy square pipe, simply rolling it can cause considerable labor.
Eliminating the heavy labor alone will significantly improve work efficiency. According to the second and third aspects of the present invention, if the side plate is moved in the longitudinal direction of the back plate, or if the back plate is expanded or contracted, it is possible to cope with both a thick square pipe and a thin square pipe. According to the fourth aspect, loss of the welding tip and the like can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a jig main body is set on a square pipe.

FIG. 2 is a perspective view showing a state where a welding tip is set in the jig main body of FIG. 1;

FIG. 3 is a perspective view of a jig main body.

FIG. 4 is a partially omitted perspective view showing a relationship between a jig main body and a welding tip.

FIG. 5 is a perspective view of a welding tip.

FIG. 6 is a cross-sectional view showing a state where a built-up portion is formed on one side of a square pipe.

FIG. 7 is a cross-sectional view showing a state where a built-up portion is formed on the opposite side of the square pipe.

FIG. 8 is a cross-sectional view of a state in which overlay portions are formed on three sides of a square pipe.

FIG. 9 is a cross-sectional view showing a state in which a built-up portion is formed on all sides of the square pipe.

FIG. 10 is a perspective view showing a state in which a built-up portion is formed by a conventional welding method.

FIG. 11 is a cross-sectional view of a conventional welded portion between a square pipe and a flange.

FIG. 12 is a cross-sectional view showing a state in which a built-up portion is formed on each side of a square pipe by a conventional method.

[Explanation of symbols]

 Reference Signs List 1 square pipe 2 flange 4 groove 5 groove plate frame 6 groove j jig body 8 back plate 10 side plate 11 side plate t welding tip 12 first guide side 13 pointed side 14 inclined side 15 second guide side 16a overlay 16b Overlay 16c Overlay 16d Overlay

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B23K 37/053 B23K 37/053 E

Claims (4)

(57) [Claims] 1. A groove is formed at a distal end opening of a square pipe, and an abutment frame is fixed to an inner peripheral surface of the apex opening. A groove is made to contact the flange of this plate
Forming and forming a built- up portion in this groove, in a welding jig for welding the square pipe and the flange, comprising a jig body and a welding tip, the jig body, with respect to the square pipe A standing back plate, and approximately 4
The welding tip is formed of a side plate having an angle of 5 degrees, and a welding tip is formed in the first guide side, which is in close contact with the flange, at a right angle to the first guide side, and in the groove.
There is a cusp side contacting the plate frame, a sloping side continuing to the cusp side and contacting the groove, and a second guide side continuing to the sloping side and contacting the square pipe. A welding jig comprising: 2. The welding jig according to claim 1, wherein the side plate is movable with respect to the back plate. 3. The welding jig according to claim 1, wherein the back plate is made extendable. 4. The welding jig according to claim 1, wherein the welding tip is slidably mounted on the side plate.