JPS6317597Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> The present invention relates to a device for fixing end tabs during plate joint welding, and shortens the time for attaching the tabs by omitting tack welding of the tabs to the plates to be welded. In addition, it is an object of the present invention to provide a plate joint welding method that can perform plate joint welding without leaving any brittle parts on the plate to be welded.

<Prior art> Generally, when plate joint welding is performed, defects are likely to occur at the beginning and end of the weld, so as a conventional countermeasure, end tabs are attached to the edges near the joint of the workpiece as shown in Figure 9. After welding was performed from the middle of the tab to the plate joint, the tack welded portion was separated by gas cutting or the like, and the cut surface was finished by polishing with a grinder or the like.

<Problems to be solved by the invention> However, in the conventional method, because the tacking distance is short and a short arc is used, the thermal change becomes large and a part of the hardened tacking bead remains in the workpiece, causing damage. This will cause the surrounding materials to become brittle.

Therefore, in structures such as bridges and crane girders that are subjected to repeated loads from vehicles, fatigue failure is likely to occur due to the embrittlement of the heat-affected area around the bead.

Further, after completing the plate joint welding, an additional step of cutting and polishing the temporarily attached tab is required, which increases the time required for the plate joint work as a whole and reduces its efficiency.

Furthermore, if a gap is created between the edges of the end tab and the plate to be welded during tack welding of the end tab, weld metal may drip from this gap during actual welding, contaminating the work area with molten droplets. The weld metal is prevented from dripping by manually pressing a plate from below between the end edges of the end tab and the plate to be welded. However, this has the disadvantage that welding work cannot be performed reliably and safely.

<Means for solving the problems> The present invention is intended to solve the above problems.
This method was proposed to maintain the quality of the plates to be welded by omitting tack welding, and to improve the efficiency of plate joining work.To achieve this purpose, it is constructed as follows.

That is, in this fixing device, the base frame 1 includes an upper frame 21, a lower frame 15 forming two side frames 15a, 15b running in parallel in the front-rear direction, a drip prevention plate 17, and a pair of guides 20a, 20b. , one guide 20a is installed on one side frame 15a in the left-right direction, and the other guide 20b is installed on the other side frame 15b in a direction inclined with respect to the one guide 20a, and the upper frame 21 A groove 5 for fitting the welding start end 4 of the plate to be welded 3 is formed in the front space of the pair of guides 20a, 20b between the lower frame 15 and the pair of guides 20a, 20b, and welding is performed in the rear space of the pair of guides 20a, 20b. An insertion space 10 for the end tab 8 is formed between the upper frame 21 and the lower frame 15, and the front end of the insertion space 10 is communicated with the rear end of the insertion groove 5, and the welding scanning opening 12 is inserted into the upper frame 21. The drip prevention plate 17 is opened in communication with the space 10 and the upper surface of the insertion groove 5, and the drip prevention plate 17 is placed between the pair of guides 20a and 20b so that the upper surface thereof is connected to the side frames 15a and 15b.
disposed on the lower frame 15 so as to be substantially flush with the upper surface of the
A fixture 6 for removably attaching the base frame 1 to the plate 3 to be welded is provided at the front of the base frame 1, and an insertion space 1 is provided at the front of the base frame 1.
A fixture 11 for fixing the end tab 8 inserted into the
is provided at the rear of the base frame 1 (numerals used in FIGS. 1 to 7 are used as reference examples).

<Effects of the present invention> Therefore, to describe the effects of the present invention brought about by the above configuration, the fixing device is inserted by applying the fitting groove to the butt part of the plates to be welded, and the end tab is inserted from the rear insertion space. After insertion, by fixing the plate to be welded and the end tab with a fixture and a fixture, respectively, the end tab can be quickly and easily attached to the abutting portion of the plate to be welded.

Therefore, it is no longer necessary to tack weld the end tab to the plate to be welded as in the past, and the thermal influence of the tack bead on the plate to be welded can be eliminated, thereby preventing deterioration of the quality of the plate to be welded.

This also means that there are no defects in the joints of the plates welded by the above fixing device, and even if the plates are used in bridges etc. that are subjected to repeated loads, cracks will not occur. It can maintain high strength without causing any damage.

On the other hand, in this fixing device, the welding scanning opening is opened on the top surface of the base frame and the area from the ed tab to the plate joint is opened upward, so the welding scanning The main welding work can be done quickly along the opening.

Furthermore, since the tack welding of the end tabs itself can be omitted, undercuts do not occur in the welded portion due to tack welding, and welding work to repair undercuts is not required.

In addition, a drip prevention plate is installed on the lower frame between the pair of guides so that its upper surface is approximately flush with the upper surfaces of both side frames of the lower frame, so that the end tab and the plate to be welded can be easily connected during fixing work using the fixing device. Even if there is a gap between the two end edges, the drip prevention plate can prevent weld metal from dripping from this gap. This prevents contamination of the workplace with molten droplets, and
There is no need to use your hands to prevent dripping, and welding work can be performed reliably and safely.

Moreover, among the pair of guides installed upright on both sides of the lower frame, one guide is oriented in the left-right direction, and the other guide is oriented in a direction that is inclined with respect to the one guide. This fixing device can easily fix the welded plates and end tabs not only when welding plates to be welded together, but also when welding two plates with different widths.

Therefore, if the welding work performed by this fixing device is integrated, the number of welding steps can be greatly reduced, and a quick and highly efficient plate joining work can be achieved.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

Figure 1 is a plan view of the fixing device, Figure 2 is its left side view, and Figure 3 is its front view. A lower frame 15 is formed, and a drip prevention plate 17 made of copper that receives weld metal is arranged in the center thereof so that its upper surface is substantially flush with the upper surfaces of both side frames 15a and 15b, and the end tab 8 and the plate to be welded are The base frame 1 is constructed by fixing a substantially U-shaped upper frame 21 above the lower frame 15 via guides 18 and 20 of (for example, copper plates) 3.

A pair of guides 20 provided in the center of the base frame 1 are
Both are rectangular plate-shaped bodies, and the left and right guides 2
0a is erected with its length direction facing left and right, and the right guide 20b is erected with its length direction facing slightly backward from the left and right direction (see Fig. 4), as shown in Fig. 6. When the widths of the copper plates 3 to be butted are different, taper the wider copper plate 3 (the right copper plate) and guide it to the right guide 20b.
If the copper plate 3 on the narrow side is guided by the left guide 20a, a good butting operation can be performed. In this case, the fitting tip edge 31 of the end tab 8 is also tapered.

In addition, when butting copper plates 3 of the same width, after aligning one copper plate 3 with the left guide 20a, use the end tab 8 having a linear fitting edge 31, and fix the mounting tool 6. By operating the tool 11, one copper plate 3 is brought into abutment with the other copper plate 3, and the end tabs 8 are fitted to fix each plate.

The space between the upper frame 21 and the lower frame 15 and located in the front direction of the pair of guides 20 is defined as the fitting groove 5 of the copper plate 3.

On the other hand, a pair of guides 18 provided at the rear of the base frame 1
are erected with their lengths directed in the front-rear direction, and the end tabs 8 are accurately oriented in the front-rear direction using these guides.

In addition, the gap between the upper frame 21 and the lower frame 15,
The space located in the front-rear direction of the pair of guides 18 is defined as the insertion space 10 for the copper plate 3.

In this case, the insertion space 10 and the insertion groove 5 communicate as a pair with a gap between the upper frame 21 and the lower frame 15, as shown in FIG. When inserted into the insertion groove 5 and butted against each other, the fitting tip edge 31 of the end tab 8 inserted from the insertion space 10 can be butted against the welding start end of the copper plate, that is, the tab contact edge 4. .

On the other hand, the upper frame 21 is a U-shaped plate-like body, and the U-shaped arms 32 are positioned in the parallel running direction of the lower frame 15, that is, in the front-rear direction, and the central opening is positioned at the front end of the upper frame 21. A notch is made from the surface 2 toward the rear, and this is used as the welding scanning opening 12.

In this case, since the welding scanning opening 12 is formed by cutting out the center of the upper frame 21, the lower part of the welding scanning opening 12 necessarily communicates with the gap between the upper frame 21 and the lower frame 15. Since the rear end portion 22 extends to the periphery of the pair of guides 18, the insertion space 10 and the upper surface of the insertion groove 5, which form the gap between the upper and lower frames, can be communicated with the scanning port 12.

A pair of mounting bolts 6 are screwed into the front side of both arm portions 32 of the upper frame 21 (therefore, the mounting bolts 6 are located in front of the guide 20), and the upper frame 2
A pair of similarly threaded fixing bolts 11 are screwed into the inside of the two guides 18 near the rear of the guide 1.

Therefore, by abutting the two copper plates 3 against this fixing device and abutting the end tabs 8 thereon, the portion from the tabs to the seam can be placed below the welding scanning port 12.

To describe how to use this fixing device, first, predetermined copper plates 3 to be welded are brought into contact with each other, and the welding start end 4 of the copper plates 3 is inserted into the fitting groove 5 of the fixing device.
Then, the fitting groove 5 is fitted onto the copper plate 3 until the tab contact edge 4 of the copper plate 3 is received by the guide 20.

Then, after tightening the mounting bolts 6 and fixing the fixing device to the copper plate 3, the welding end tab 8 is inserted from the insertion space 10 that opens at the rear of the base frame 1, and is swung along the guide 18. While
After bringing the leading edge 31 into contact with the tab abutting edge 4 of the copper plate 3, the fixing bolt 11 is tightened to fix the tab 8 (see FIG. 7).

Next, welding is performed from the tab 8 facing the welding scanning port 12 of the base frame 1 to the joint between the copper plates 3 to complete the predetermined plate joint welding.

Thereafter, the fixing bolts 11 of the base frame 1 are loosened to remove the tabs 8 from the copper plate 3, and the mounting bolts 6 are loosened to remove the entire fixing device from the welded copper plate 3.

[Brief explanation of the drawing]

1 to 8 show an embodiment of the present invention, in which FIG. 1 is a plan view of the fixing device, FIG. 2 is a left side view thereof, FIG. 3 is a front view thereof, and FIG. 4 is a plan view of the fixing device. is the second
Figure 5 is a sectional view taken along the - line in Figure 1, Figure 6 is an exploded perspective view taken at the center of the fixing device in the vertical direction, and Figure 7 is a perspective view showing how the fixing device is used. , FIG. 8 is a plan view showing a state in which an end tab is fitted to a plate to be welded, and FIG. 9 is a perspective view showing a conventional welding method. DESCRIPTION OF SYMBOLS 1... Base frame, 2... Front end surface of 1, 3... Plate to be welded, 4... Welding start end of 3, 5... Fitting groove, 6...
...Fixing tool, 7... Rear end of 1, 8... End tab for welding, 10... Insertion space, 11... Fixing tool, 1
2...Welding scanning port, 17...Dripping prevention plate, 20...
…guide.

Claims (1)

[Scope of utility model registration request] The base frame 1 has an upper frame 21, a lower frame 15 forming two side frames 15a, 15b running in parallel in the front-rear direction, a drip prevention plate 17, and a pair of guides 20a, 20b. One guide 20a is erected in the left-right direction, and the other guide 20b is erected in the direction inclined with respect to the one guide 20a on the other side frame 15b, and the upper frame 21 and the lower frame 1
A groove 5 for fitting into the welding start end 4 of the plate to be welded 3 is formed in the front space of the pair of guides 20a, 20b between the two guides 20a, 20b.
Insertion space 10 for welding end tab 8 in rear space
An insertion space 10 is formed between the upper frame 21 and the lower frame 15.
communicates with the rear end of the insertion groove 5, and opens the welding scanning opening 12 in the upper frame 21 so as to communicate with the insertion space 10 and the upper surface of the insertion groove 5, and connects the pair of guides 20a and 20b. The drip prevention plate 17 is disposed on the lower frame 15 with its upper surface being substantially flush with the upper surfaces of both side frames 15a and 15b, and the mounting tool 6 for removably attaching the base frame 1 to the plate 3 to be welded is attached to the base. An end tab fixing device for plate joint welding, characterized in that a fixture 11 for fixing an end tab 8 inserted into an insertion space 10 is provided at the front of a frame 1 and at the rear of the base frame 1.