JPH09285894A - Deposition jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a possibility of scraping off unnecessarily and deeply a material to be deposited when removing the deposition jig from the material, and to suppress the occurrence of a micro-defect by providing a gap between the end edge part of the main body of the deposition jig and the material. SOLUTION: For a linear 2 formed by a thin metal plate, the surface of the thin metal plate is closely butted and overlaid on the surface of a flat square barrel main body 1 opposed to the material, and is positioned so that a gap with prescribed interval and depth from the end edge part of the surface of the square barrel main body 1, can be formed. And, by butting and pressurizing the tip of an electrode on the center part of the outside surface of the liner 2 and the center part of the outside surface of the opposite square barrel main body 1 corresponding to the center part of the outside surface of the liner 2, and by resistance welding, that is, by the spot welding of lap resistance welding, a joining part 4 melted between the surface of the square barrel main body 1 and the surface of the liner 2, is formed and joined. The deposition jig of the square barrel formed by joining the liner 2 to the square barrel main body 1, is mounted on the material by fillet welding, and is used as the deposition jig for aligning grooves.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding jig which is attached to a material to be welded by fillet welding, for example, side plate welding of a cylindrical tank, spherical shell plate welding of a spherical tank, or pipe welding. Sometimes, the side plate of a cylindrical tank, the spherical shell plate of a spherical tank, or the corner piece of a welding edge alignment welding jig used by attaching fillet welding to the material to be welded such as pipes, or heavy steel parts The present invention relates to a welding jig such as a hook with a pedestal of a hanging tool welding jig, which is used by attaching a pedestal to a heavy steel part of a material to be welded by carrying out fillet welding.

[0002]

2. Description of the Related Art As is well known, fillet welding is to weld two surfaces that are substantially orthogonal to each other with a weld metal having a substantially triangular cross section. As an example of a conventional welding jig to be attached by fillet welding, 6 to 8 show the square pieces of the welding groove alignment welding jig used for side plate welding of the cylindrical tank.
It will be described based on.

First, a steel square piece 31 having a hexagonal rectangular parallelepiped appearance formed by forming a through-hole cylindrical hole 32 in the central portion thereof is used. The cylindrical hole 32 is welded to a steel plate side plate 33 to be welded, and a welding groove 34 is formed. In parallel with the side plates 33, 33, and the surface of the square piece 31 that is in contact with the side plate 33 of the material to be welded is connected to the upper edge and the three edges of both sides and the side plate 33 orthogonal to the surface. The surfaces are welded to each other by fillet welding 35, and the square pieces 31, 31 are attached to the side plates 33, 33 sandwiching the welding groove 34 with a required distance.

Then, the square piece 31 is combined with a strong back geta 39 formed by connecting a groove-shaped material 37 with a rectangular hole 36 by a strip-shaped material 38, and a conical taper pin is fitted in the cylindrical hole 32 of the square piece 31. I put in the boroshin 40 and geta 39
Is fixed.

Then, the side plates 33, which are temporarily assembled apart from each other,
When pulling in 33, as shown in FIG. 7, the square arrows 41, 41 of the cotter-shaped taper pin are driven between both outer side walls of the groove-shaped members 37, 37 and both outer side surfaces of the square pieces 31, 31, and When the side plates 33, 33 that have been temporarily assembled close to each other are to be separated, both inner side walls of the groove-shaped members 37, 37 and the square piece 3 are separated.
The square arrows 41, 41 of the cotter-shaped taper pin are driven between the inner side surfaces 1 and 31. In addition, what you type is a square arrow 4
In some cases, borocine 40 may be used instead of 1.

Thus, the square piece of the welding jig which is attached to the side plate of the material to be welded by fillet welding is conveniently used as a welding jig for side plate welding groove alignment of a cylindrical tank.

This prior art example shows a square piece of a welding groove alignment welding jig used for side plate welding of a cylindrical tank. A square piece of a welding groove alignment welding jig used when performing the welding and joining is similarly used by being attached to a spherical shell plate or a pipe of a material to be welded by fillet welding.

[0008]

However, the square piece 31 of the conventional welding jig, which is attached to the side plate 33 of the material to be welded by the fillet welding 35 as described above, is shown in FIGS. 8 (a) and 8 (b). As described above, when the weld metal portion of the fillet weld 35 and the lower portion of the square piece 31 are deleted with an air arc gouging machine or a grinder and the square piece 31 after use is to be removed from the side plate 33, the square piece 31 Since it is attached to the side plate 33 in close contact with the fillet weld 35, the boundary line between the side plate 33 and the square piece 31 is not clearly identified. Therefore, when the fillet weld 35 is deleted, the side plate 33 of the material to be welded is often shaved deeper than necessary to form the concave portion 42, and the concave portion 42 at the deeply shaved portion is built up. It was necessary to repair the surface of the overlay welded portion by welding and to smoothly finish it by grinder grinding finish, and the jig mark repairing work was complicated and took a lot of trouble.

Further, after removing the square piece 31 of the welding jig, the fillet root portion of the fillet weld 35 in which the side plate 33 of the material to be welded and the square piece 31 are joined, that is, the side plate 33 and the square piece 31 contact each other. There is also a problem that discontinuous crack-like fine defects 43, for example, a fine defect 43 having a depth of 1 mm or less and a length of 3 mm or less, are often found along the fusion line of the fillet root portion of the contact edge. It was

The present invention has been made in view of the above problems of the prior art, and solves the problem of removing the welding material deeper than necessary when removing the welding jig from the welding material, and (EN) Provided is a welding jig which is easy to manufacture and which solves the problem of the generation of fine defects that tend to occur in the fillet welding root portion.

[0011]

In order to solve the above-mentioned problems, a welding jig to be attached by fillet welding of the present invention is provided between a welding jig main body end edge portion and a material to be welded at a fillet welding site. A gap of a predetermined interval is provided, and the gap of the predetermined interval is a predetermined gap toward the inner side of the welding jig body with a predetermined depth in parallel with a predetermined depth. The welding jig main body surface is formed so as to abut against the material to be welded so that the gap has a cross-sectional shape having a predetermined depth with a widened width. Then, by securing a gap having a predetermined distance and depth between the welding jig and the material to be welded, generation of microscopic defects that are likely to occur in the fillet welding root portion is suppressed, and the welding jig and the material to be welded are prevented. By clarifying the boundary with the material to be welded, when the welding jig is removed from the material to be welded, the material to be welded is not shaved deeper than necessary.

Further, a flat plate-shaped welding jig body surface facing the material to be welded is provided with a thin plate material having a size smaller than the welding jig body surface so that a gap having the above-mentioned predetermined interval and depth is provided. The above liner is superposed and joined to form a welding jig. The welding jig is formed so that a gap having a predetermined space and depth around the outer edge of the liner can be reliably secured between the welding material and the welding jig, and the manufacturing of the welding jig is extremely easy. It is formed so that it can be done.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A welding jig according to the present invention will be described in detail with reference to an embodiment of a square piece shown in FIGS.
In the figure, 1 is a rectangular parallelepiped main body having a rectangular parallelepiped shape (including a flat plate shape) which serves as a welding jig main body, and 2 is a liner made of a thin plate material whose one surface is joined to one surface of the rectangular parallelepiped main body 1. Is.

In order to use the groove-matching welding jig described in detail in the section of the prior art, the square piece main body 1 is made of a steel material to form a hexagonal rectangular parallelepiped, and the hexagonal rectangular parallelepiped has a central portion. Borocine with a conical taper pin (reference numeral 4 in FIGS. 6 and 7)
The cylindrical hole 3 penetrating in a circular cross section having a required diameter dimension into which 0) can be inserted is provided. The hexagonal rectangular parallelepiped external shape of the square piece main body 1 may be formed in a flat plate shape.

The liner 2 is made of the same steel material as that of the square piece body 1 or a thin plate of a predetermined size which is made of another material excellent in joining to one surface of the square piece body 1 by welding or adhesion. Cut to size and form.

The thickness of the thin plate material forming the liner 2 depends on the fillet size of the fillet weld 6 for welding the square piece body 1 and the material 5 to be welded. The thickness of the gap 7 which is not larger than the gap distance dimension of the gap 7 and the fillet weld 6 is removed by air arc gouging, grinder or the like, and when the square piece body 1 is removed from the welded material 5, the square piece The thickness of the boundary between the main body 1 and the material to be welded 5 is equal to or larger than the separation distance dimension of the gap 7 which can be clearly discriminated during the removal work. For example, when the fillet size is about 5 mm to 15 mm, about 1 mm to 5 mm. Thickness.

The size of the liner 2 formed of the thin plate material depends on the fillet size of the fillet weld 6 for welding the square piece body 1 and the material to be welded 5, but the fillet weld 6 to be applied. Of the square piece main body 1, that is, the surface of the square piece main body 1 facing the welded material 5 and having a size equal to or smaller than a dimension in which a predetermined depth distance is secured so that the inner front end portion does not contact the outer edge of the liner 2; The size is such that it can be stably joined to the surface of the square piece main body 1 facing the, for example, when the fillet size is about 5 mm to 15 mm, the spacing between the outer edge of the square piece main body 1 surface and the liner 2 outer edge, that is, The width of the predetermined depth of the gap 7 is 3 mm to 10 mm
The size is set so that it becomes a degree.

The liner 2 formed of a thin plate material having the above-described thickness and size is superposed on the surface of the thin plate material in close contact with the surface of the flat square piece main body 1 facing the material 5 to be welded. , So that the gap 7 having the above-mentioned predetermined distance and depth can be formed from the edge portion of the surface of the square piece main body 1. Then, the tip of the electrode is brought into contact with the central portion of the outer surface of the liner 2 and the central portion of the outer surface of the square piece body 1 on the opposite side corresponding to the central portion of the outer surface to apply pressure to resistance welding, that is, spot welding of lap resistance welding. A melted joint portion 4 is formed between the surface of the square piece body 1 and the surface of the liner 2 to join them.

The square piece of the welding jig formed by joining the liner 2 to the square piece body 1 by spot welding in this manner has a rectangular cross-section annular gap 7 around the outer edge of the liner 2 at a predetermined gap.
Can be reliably ensured, and the joining work can be efficiently performed by spot welding. However, the square piece body 1 and the liner 2 are joined together by an adhesive, or the outer edge of the liner 2 and the surface of the square piece body 1 are short beads such as TIG welding or carbon dioxide arc welding. The welding may be performed by welding or the like.

The welding jig for the square piece formed by joining the liner 3 to the square piece body 1 as described above is attached to the material to be welded 5 by fillet welding 6 and explained in the above-mentioned section of the prior art. Although it is used as a groove alignment welding jig,
As shown in FIG. 2, in order to remove the welding jig of the square piece from the material to be welded 5 after its use, the fillet weld 6 and the lower part of the square piece body 1 are deleted by an air arc gouging or a grinder, and the deletion portion 8 As the gap is formed, a gap 7 indicating the boundary between the square piece main body 1 and the material to be welded 5 appears in the deletion portion 8 during the deletion work, and in order to clearly indicate the end of the deletion work, the welding of the square pieces There is no need to worry about scraping the welded material 5 deeper than necessary during jig removal work.

Further, in the welding jig for the square piece formed by joining the liner 2 to the square piece body 1, the tip of the fillet weld 6 of the attachment welding is located in the gap 7 having a predetermined interval and depth. Moreover, since the narrow contact portion between the outer edge portion of the liner 2 and the material to be welded 5 does not come into contact with the narrow contact portion, the generation of discontinuous crack-like fine defects that are likely to occur in the fillet root portion of the narrow contact portion is suppressed. be able to.

Discontinuous crack-like fine defects, which are often found along the fusion line of the fillet root of fillet welding, are formed when the weld metal solidifies due to a local shift in solidification time. It is thought that, like the comparative example of FIG.
The lower end of the square piece main body 11, that is, the lower end of the square piece main body 11 that abuts on the welded material 15 is chamfered in a triangular cross section, and the tip of the fillet weld 16 makes the welded material 15 and the square piece main body 11 have the same shape. If it is formed so as not to come into contact with the narrow contact surface 13, it is considered that the generation of the fine defects can be suppressed.

However, the square piece of the welding jig formed by chamfering as in the comparative example of FIG. 3 has a structure in which a gap 12 having a triangular cross section is formed so that the inner space is narrowed.
The tip of the weld metal of the fillet weld 16 constructed with the welding rod 14 aiming at the contact easily comes into contact with the narrow contact surface 13, and due to the contact, fine defects are likely to occur, and also the square piece body 11 and the welded body are welded. The boundary with the material 15 becomes unclear, which may cause the problem of shaving the material 15 to be welded deeper than necessary.

FIG. 4 shows a square piece of a welding jig having a chamfered structure that solves the above problems. As in the embodiment shown in FIG. 4, this square piece has a gap 22 at a predetermined interval between the lower end portion of the square piece body 21 of the welding jig body, that is, the lower end portion of the square piece body 21 contacting the material 24 to be welded. Are chamfered into a trapezoidal cross section that widens toward the inside of the square piece main body 21 to a predetermined depth, and are formed so as to project, or, although not shown, toward the inside of the square piece main body 21 at the same predetermined intervals The weld metal tip of fillet weld 25, which is formed by chamfering a rectangular cross section with a gap 22 to a predetermined depth and projecting the lower end, is constructed with a welding rod (not shown) aiming at the gap 22. The material to be welded 24 and the narrow contact surface 23 of the square piece body 21 are formed so as not to come into contact with each other.

Since the square piece of the welding jig formed by chamfering as shown in FIG. 4 has a wide space behind the gap 22, the tip of the weld metal of the fillet weld 25 to be constructed with a welding rod aiming at the gap 22. The part does not come into contact with the narrow contact surface 23. Therefore,
Since the generation of fine welding defects can be suppressed and the boundary between the square piece body 21 and the material to be welded 24 becomes clear, there is no fear of causing the problem of cutting the material to be welded 24 deeper than necessary. .

Further, the welding jig of the above-mentioned embodiment is
Although the square piece is described in detail as an example, as shown in FIG. 5, when a heavy steel material part is lifted by a crane or the like, a steel thin plate circle is used as a welded material (not shown) of the heavy steel material part. A steel disk-shaped pedestal 27 to which a liner 26 made of a plate material is joined can be attached by fillet welding, and can be used as a welding jig for the hook 28 with the pedestal 27 of the hanging tool welding jig according to the present invention. The welding jig according to the present invention is
It is needless to say that the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the gist of the present invention.

[0027]

As described above, according to the welding jig of the present invention, the gap between the welding jig body end edge portion at the fillet welding location and the material to be welded has a rectangular cross section or a cross sectional shape widened inward. Since the protruding welding jig body surface that abuts the material to be welded is formed so as to provide a gap, it is possible to reliably secure a gap having a predetermined distance and depth between the welding jig and the material to be welded. Since the secured gap makes the boundary between the welding jig and the material to be welded clear, when the welding jig is detached from the material to be welded, there is no fear of shaving the material to be welded deeper than necessary. Furthermore, the secured gap also suppresses the generation of fine defects that are likely to occur at the root portion of fillet welding. Therefore, the welding jig can suppress the generation of welding defects and can significantly reduce the repair of the jig trace.

Further, the welding jig formed by joining the liner to the surface of the flat welding jig body facing the material to be welded has a gap having a predetermined gap and depth around the outer edge of the liner which is excellent in the above effect. The welding jig can be manufactured reliably by simply joining the liner to the surface of the welding jig body by spot welding of lap resistance welding or the like. Therefore, the welding jig can be efficiently and extremely easily manufactured.

[0029]

[Brief description of drawings]

FIG. 1 is an overall perspective explanatory view showing a square piece which is an embodiment of a welding jig according to the present invention.

FIG. 2 is a cross-sectional explanatory view showing a state in which a fillet weld portion of a square piece, which is an embodiment of the welding jig according to the present invention, is deleted.

FIG. 3 is a cross-sectional explanatory view showing a square piece of a comparative example.

FIG. 4 is an explanatory sectional view showing a square piece of the chamfered structure according to the present invention.

FIG. 5 is a perspective view showing another embodiment of the welding jig according to the present invention.

FIG. 6 is an explanatory perspective view showing a state in which a square piece is welded to a side plate.

FIG. 7 is a perspective explanatory view showing a usage state of a square piece.

FIG. 8 is a cross-sectional explanatory view showing a relationship between a conventional welding jig and a material to be welded, (a) shows a state in which the welding jig is attached by fillet welding, and (b) shows the fillet. Shows the state where welding is deleted.

[Explanation of symbols]

1,21 Square piece main body 2,26 Liner 3 Cylindrical hole 4 Joining part 5,24 Welding material 6,25 Fillet welding 7,22 Gap 8 Deletion part 27 Pedestal 28 Hook

Claims (2)

[Claims] 1. A welding jig to be attached to a material to be welded by fillet welding, wherein a gap of a predetermined interval is provided between an end edge portion of the welding jig main body at a portion where the fillet welding is performed and the material to be welded. The gap with a predetermined interval has a predetermined depth parallel to the inside of the welding jig main body with a predetermined depth, or has a predetermined depth in which the gap with a predetermined interval widens toward the inside of the welding jig main body. A welding jig, characterized in that a protruding welding jig body surface is formed so as to come into contact with the material to be welded so as to form a gap having a sectional shape. 2. A thin plate material having a size smaller than the surface of the welding jig body, on a flat surface of the welding jig body facing the material to be welded so that a gap having the predetermined distance and depth is provided. 2. The welding jig according to claim 1, wherein the welding jig is formed by superposing and joining a liner made of.