JPH0661388U - Temporary jig for fillet welding of steel pipe - Google Patents

Abstract

(57) [Abstract] [Purpose] In the tack welding work performed in the work process of fillet welding a steel pipe and a joint or a flange, etc., it is possible to perform accurate tack welding, and to be welded. To obtain a temporary jig for fillet welding of steel pipes, in which the accuracy of squareness, parallelism, concentricity, etc. is always stable and no visual inspection and correction work is required. [Structure] Steel pipe inserting cylindrical portion 12 for inserting a steel pipe
And the locking portion 1 that is raised in a ring shape having a diameter larger than this cylindrical portion
4 and a fixing cylindrical portion 16, positioning and fixing the joint or the flange in a positional relationship with the locking portion 14, and locking the steel pipe inserted in the steel pipe inserting cylindrical portion 12 to thereby fix the joint or It is configured to perform tack welding at the joint between the flange and the steel pipe.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tack welding jig used for fillet welding of a steel pipe and a joint or a flange.

[0002]

[Prior art]

 Generally, in welding work, first of all, the tack welding work is carried out while inspecting and correcting necessary items such as the squareness, parallelism, concentricity, etc. between the work pieces, and then the regular welding work is carried out. Is the general work procedure. Similarly, when performing fillet welding between a steel pipe and a joint or a flange, tack welding is also performed first.

However, in this tack welding work, every time one tack welding is performed, the squareness, parallelism, concentricity, etc. between the steel pipe and the joint or flange are checked, and if necessary, a hammer or the like is used. While tapping the steel pipe with a measuring instrument such as a squarer, the normal method is to visually correct the right angle, parallelism, concentricity, etc., and then proceed with the tack welding in sequence. .

[0004]

[Problems to be solved by the device]

 However, in the visual inspection and correction work method, the accuracy of the squareness, parallelism, concentricity, etc. of the tack welded work pieces is large, and the quality is unstable. . Also, for visual inspection, the tack welding work is performed while repeatedly performing repeated inspections and corrections, resulting in a large number of man-hours, poor work efficiency, and high product cost. There is a drawback that will lead to.

Therefore, an object of the present invention is to perform accurate tack welding in tack welding work performed in a fillet welding process between a steel pipe and a joint or a flange. In addition, the accuracy of the squareness, parallelism, concentricity, etc. of the work to be welded is always stable, and no visual inspection or correction work is required. It is to provide a temporary jig for fillet welding.

[0006]

[Means for Solving the Problems]

 The temporary jig for fillet welding of a steel pipe according to the present invention comprises a steel pipe inserting cylindrical portion for inserting the steel pipe, a ring-shaped locking portion having a diameter larger than the cylindrical portion, and a fixing cylindrical portion. The joint or flange is positioned and fixed in the positional relationship with the locking portion, and the steel pipe inserted into the steel pipe inserting cylindrical portion is locked, and temporarily attached to the joint between the joint or flange and the steel pipe. It is characterized in that it is configured to perform welding.

In the above-mentioned temporary jig for fillet welding of steel pipe, the fixing cylindrical portion is fixed by the fixing means including a three-way chuck and is locked at the locking portion, and the joint is inserted into the steel pipe on the three-way chuck. After inserting and arranging through the universal cylinder, the steel pipe can be inserted through the cylindrical cylinder for inserting the steel pipe, and tack welding can be performed at the joint between the joint and the steel pipe.

[0008] Further, a flange holding substrate for holding the flange extending outward from a locking portion provided in the steel pipe inserting cylindrical portion is provided, and a flange coupling tool insertion hole is provided on the flange holding substrate. A screw shaft is erected at at least two positions facing each other at a position corresponding to the part, and when a flange is placed on the flange holding substrate, a nut for fixing the flange is screwed onto the screw shaft. can do.

In this case, after the flange is placed on the flange holding substrate, the steel pipe is inserted into the steel pipe inserting cylindrical portion and is locked on the locking portion to temporarily weld the joint to the flange and the steel pipe. Can be configured to do.

[0010]

The temporary jig for fillet welding of a steel pipe according to the present invention includes a steel pipe inserting cylindrical portion for inserting a steel pipe, a ring-shaped locking portion having a diameter larger than the cylindrical portion, and a fixing portion. With this structure, it is possible to perform accurate tack welding work, and the accuracy of squareness, parallelism, concentricity, etc. of the workpieces after tack welding is always stable. In addition, it is possible to shorten the work process, improve the work efficiency, and reduce the product cost without the need for any visual inspection and correction work in the conventional tack welding work.

[0011]

【Example】

 Next, an embodiment of a temporary jig for fillet welding of a steel pipe according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a temporary jig for fillet welding of a steel pipe according to the present invention, and is a perspective view showing an embodiment of a temporary jig for fillet welding of a steel pipe and a joint. Is. In FIG. 1, reference numeral 10 indicates a temporary jig body, and the temporary jig body 10 includes a steel pipe inserting cylindrical portion 12 and a cylindrical portion 12 on the lower end side of the cylindrical portion 12. It is composed of a locking portion 14 having a large diameter and protruding in a ring shape, and a fixing cylindrical portion 16 having substantially the same diameter as the steel pipe inserting cylindrical portion 12.

Next, regarding the function of the provisional jig main body 10 of the present embodiment having the above-described configuration, an example of use in the case of provisionally welding a steel pipe and a joint will be described with reference to FIGS. A description will be given with reference to (a) to (d) of FIG.

First, as shown in FIG. 2A, the fixing cylindrical portion 16 of the jig body 10 is held by a fixing means 18 such as a three-way chuck. In this case, as shown in FIG. 3A, the lower end edge of the locking portion 14 of the jig body 10 is locked and fixed to the upper end portion of the chuck claw portion 20.

Next, as shown in FIG. 2B, the joint 22 is inserted from the upper end of the steel pipe inserting cylindrical portion 12 of the jig body 10. In this case, as shown in FIG. 3 (b), the joint 22 is set such that the central portion 22a of the inner diameter thereof is sized to match the outer diameter of the steel pipe inserting cylindrical portion 12, and the one end portion 22b side of the inner diameter is set. Is set to a large diameter by the thickness of the steel pipe 24 through which the steel pipe inserting cylindrical portion 12 is inserted, and the other end 22c side of the inner diameter is a large diameter that can accommodate the locking portion 14 of the jig body 10. Is set to the dimension of.

Then, as shown in FIG. 2C, the steel pipe 24 is inserted from the upper end of the steel pipe inserting cylindrical portion 12 of the jig body 10. In this case, as shown in FIG. 3 (c), the lower end of the steel pipe 24 is located inside the steel pipe inserting cylindrical portion 12 formed on the one end 22b side of the joint 22. Inserted and positioned.

After setting in this way, as shown in FIG. 2D, a welding torch 26 is used, and the joint between the upper end of the joint 22 and the steel pipe 24 is appropriately spaced from each other. Temporary welding is performed [see (d) of FIG. 3]. In this case, it is generally sufficient to provide four tack welds 28 at four locations.

In this way, the steel pipe 24 to which the joint 22 is tack welded is immediately pulled out from the steel pipe inserting cylindrical portion 12 of the jig body 10 as it is, thereby completing the tacking.

As described above, according to the provisional jig for fillet welding of the steel pipe of the present embodiment, the perpendicularity and parallelism between the objects to be welded by visual inspection, which are conventionally required at the time of provisional tack welding, Accurate tack welding can be easily achieved without any need for inspection and correction of concentricity.

FIG. 4 shows another embodiment of a temporary jig for fillet welding of a steel pipe of the present invention, showing an embodiment of a temporary jig for fillet welding of a steel pipe and a flange. It is a perspective view. In FIG. 4, reference numeral 30 denotes a temporary jig body, and the temporary jig body 30 has a steel pipe insertion cylindrical portion 32 and a diameter larger than the cylindrical portion 32 on the lower end side of the cylindrical portion 32. A ring-shaped steel pipe locking portion 34, a flange holding substrate 36 that extends outwardly from the steel pipe locking portion 34 and holds a flange, and is substantially the same as the steel pipe inserting cylindrical portion 12. It is composed of a diameter fixing cylindrical portion 38. Then, on the flange holding substrate 36, screw shafts 40, 40 are erected in advance at at least two positions facing each other at a position corresponding to the fitting insertion hole of the flange.

Next, regarding the function of the provisional jig body 30 of the present embodiment having the above-described configuration, an example of use in the case of provisionally welding a steel pipe and a flange will be described with reference to FIGS. A description will be given with reference to FIGS. 6A and 6B.

First, although not shown, the fixing cylindrical portion 38 of the jig body 30 is fixed by an appropriate means. Next, as shown in FIG. 5A, the flange 42 is placed on the flange holding substrate 36 of the jig body 30, and the fastener insertion holes 44, 44 are inserted into the screw shafts 40, 40, respectively. Let Then, in this case, as shown in FIG. 6A, nuts 46, 46 are screwed onto the screw shafts 40, 40 to firmly fix the flange 42 on the flange holding substrate 36.

Next, as shown in FIG. 5B, the steel pipe 48 is inserted from the upper end of the steel pipe inserting cylindrical portion 32 of the jig body 30. In this case, as shown in FIG. 6B, the lower end of the steel pipe 48 is engaged with the steel pipe engaging portion 34 formed in a part of the steel pipe inserting cylindrical portion 32 of the jig body 30. Are positioned together.

After setting in this way, as shown in FIG. 5B, the welding torch 26 is used and the joint between the upper end portion of the flange 42 and the steel pipe 48 is appropriately spaced from each other. Temporary welding is performed [see (c) of FIG. 5]. In this case, it is generally sufficient to provide four tack welds 50.

In this way, the steel pipe 48 with the flange 42 temporarily welded thereto can be immediately pulled out from the steel pipe inserting cylindrical portion 32 of the jig body 30 by removing the nuts 46, 46 from the screw shafts 40, 40. The tacking can be completed.

Accordingly, even with the temporary fitting jig for fillet welding of the steel pipe of the present embodiment, as in the case of the above-mentioned embodiment, the right angle between the objects to be welded by visual inspection, which is conventionally required at the time of tack welding, Accurate tack welding can be easily achieved without any need for inspection and correction of parallelism, concentricity, and the like.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and many improvements and modifications can be made without departing from the spirit thereof.

[0028]

[Effect of device]

 As described above, the provisional jig for fillet welding of the steel pipe according to the present invention is provided with a steel pipe inserting cylindrical portion for inserting the steel pipe, and a locking portion protruding in a ring shape having a diameter larger than the cylindrical portion. And a fixing cylindrical portion, the joint or the flange is positioned and fixed in the positional relationship with the locking portion, and the steel pipe inserted in the steel pipe inserting cylindrical portion is locked to fix the joint or the flange and the steel pipe. The joints and flanges that are welded to the steel pipe and fillet are properly positioned by structuring temporary welding at the joints with and, and these positionings are performed with high-precision squareness, parallelism, and concentricity, respectively. It is possible to maintain a high speed and correctness without the need to visually check and correct the squareness, parallelism, and concentricity of the workpiece by visual inspection, which was required in the conventional tack welding. A tack welding can be performed, thereby achieving an improvement in shortening the working efficiency of the working process, it is possible to easily realize the product cost.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a temporary attachment jig for fillet welding of a steel pipe according to the present invention.

2 (a) to 2 (d) are schematic perspective views each showing a tacking operation state of a tacking jig for fillet welding of the steel pipe shown in FIG.

3 (a) to 3 (d) are schematic cross-sectional views showing a tacking operation state of a tacking jig for fillet welding of a steel pipe corresponding to FIGS. 2 (a) to 2 (d).

FIG. 4 is a perspective view showing another embodiment of a temporary jig for fillet welding of a steel pipe according to the present invention.

5 (a) to 5 (c) are schematic perspective views each showing a tacking operation state of a tacking jig for fillet welding of the steel pipe shown in FIG.

6 (a) and 6 (b) are schematic cross-sectional views showing a tacking operation state of a tacking jig for fillet welding of a steel pipe corresponding to FIGS. 5 (a) and 5 (b), respectively.

[Explanation of symbols]

 10 Temporary Fixing Jig Body 12 Steel Pipe Insertion Cylindrical Part 14 Locking Part 16 Fixing Cylindrical Part 18 Fixing Means 20 Chuck Claw Part 22 Joint 22a Joint Inner Diameter Central Part 22b Joint Inner Diameter One End 22c Joint Inner Diameter Others End part 24 Steel pipe 26 Welding torch 28 Temporary welding part 30 Temporary jig body 32 Steel pipe inserting cylindrical part 34 Steel pipe engaging part 36 Flange holding substrate 38 Fixing cylindrical part 40 Screw shaft 42 Flange 44 Joint inserting hole Part 46 nut 48 steel pipe 50 temporary welding part

Front Page Continuation (72) Inventor Kakichi Morita 2-16-2 Noguchi-cho, Higashimurayama, Tokyo Inside Kisou Co., Ltd. Higashimurayama Mfg. Co., Ltd. (72) Yoshimasa Uehara 2-16-2 Noguchi-cho, Higashimurayama, Tokyo 2nd Kiso Co., Ltd. Higashimurayama Works

Claims (4)

[Scope of utility model registration request] 1. A steel pipe inserting cylindrical portion for inserting a steel pipe, a ring-shaped locking portion having a diameter larger than this cylindrical portion, and a fixing cylindrical portion, and the position of the locking portion. A steel pipe characterized by positioning and fixing the joint or the flange in relation to each other, locking the steel pipe inserted in the steel pipe inserting cylindrical portion, and performing tack welding at the joint between the joint or the flange and the steel pipe. Temporary jig for fillet welding. 2. The fixing cylindrical portion is fixed by a fixing means composed of a three-way chuck and is locked at the locking portion, and the joint is inserted and arranged on the three-way chuck through the steel pipe inserting cylindrical portion, and then the steel pipe is inserted. The temporary jig for fillet welding of a steel pipe according to claim 1, wherein the steel pipe is inserted and arranged in the general-purpose cylindrical portion to perform temporary welding at a joint between the joint and the steel pipe. 3. A flange holding substrate for holding a flange extending outward from an engaging portion provided on a steel pipe inserting cylindrical portion, and a flange fitting insertion hole portion on the flange holding substrate. A screw shaft is erected at least at two positions corresponding to the position corresponding to the above, and a nut for fixing the flange is screwed onto the screw shaft when the flange is placed on the flange holding substrate. A temporary jig for fillet welding of a steel pipe according to claim 1. 4. After the flange is placed on the flange holding substrate, the steel pipe is inserted into the steel pipe inserting cylindrical portion and is locked on the locking portion to perform temporary welding at the joint between the flange and the steel pipe. The temporary jig for fillet welding of a steel pipe according to claim 3, which is configured to be performed.