JPS6357159B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding support device used when automatically welding a large steel plate block or the like on one side using a backing material.

For LNG tank roof plates, side plates, bottom plates, etc., steel plate blocks (two plate joints) are welded at the factory to shorten the on-site installation process. In addition, in this case, since the material to be welded is large, single-sided automatic welding is generally performed, but there are problems in that it requires a large amount of man-hours to align the plate surfaces, set the backing material, and prevent misalignment during welding. It had

That is, conventionally, as shown in FIG.
A strong back (reinforcing material) b is fixed by welding d along the welding groove c at a pitch of, for example, 300 to 400 mm from the back side of a', and the plates are aligned so that there is no misalignment, and then the materials to be welded a, A backing material (copper pad) e was applied along the back side of the groove c of a' and set using a wedge f. g indicates an automatic welding machine.

However, in the above conventional method, (a) Fixing of reinforcing material b by welding d, setting of copper dowel e by wedge f, etc. are all done by welding material a,
Workability and efficiency are poor because the work is done from the back side of a′.

(b) It is necessary to cut and remove the reinforcing material b welded to the materials to be welded a and a', and furthermore, the welding material d must be removed after being removed.
Finishing with a grinder, etc. is difficult because beads remain.

(c) If misalignment of plates occurs due to thermal deformation during welding of materials to be welded a and a', it is impossible to correct the misalignment, so it is necessary to fix the plates by welding with reinforcing material b before welding. However, it is troublesome to align the board surfaces at that time.

It had problems such as:

The present invention was made in view of these circumstances, and includes two lower support beams that separately support two pieces of workpieces with their grooves butted against each other, and an air hose connected between the support beams. The pressing beam is pressed from below against each workpiece by expansion of By placing an upper presser beam on the material, which can be fixed at both ends to the lower support beam via a clamping device, and has offset adjustment screws at the required intervals in the longitudinal direction,
To omit all manual work by workers on the underside of the welded material, to significantly improve workability and efficiency, and to prevent mistakes that occur during welding of the welded material to ensure good welding. With the goal.

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 2 and 3 show an example of the present invention, in which grooves 2 of materials to be welded 1 and 1' are butt-matched, and the materials to be welded are placed at a required interval so as to sandwich the grooves 2. I-shaped lower support beams 4, 4' are provided for supporting the materials 1, 1' separately on upper supports 3, 3', and lower flanges 5, 5' of the lower support beams 4, 4' are provided. A mold guide beam 6 is provided above. Further, inside the guide beam 6, there is provided an H-shaped pressing member, which has an intermediate plate 7, and whose lower ends 8, 8' can move up and down using the rising portions 9, 9' on both sides of the guide beam 6 as guides. A beam 10 is provided, and asbestos 1 is placed between the upper ends 11 and 11' of the pressing beam 10.
2 and fixed with bolts 13. Furthermore, a glass tape 1 is placed on top of the asbestos 12.
A copper pad 15 is placed through the hole 4. Furthermore, air hoses 17 and 18 are separately provided between the guide beam 6 and the intermediate plate 7 and between the intermediate plate 7 and the asbestos 12, respectively, to expand and contract by supplying and extracting compressed air 16. , constitutes a lower welding support device A.

Further, I-shaped upper presser beams 19, 19' are provided corresponding to the respective upper portions of the lower support beams 4, 4'.
and the presser beams 19,1
Holder plates 20, 20' are welded to the inside of the lower part of the presser plates 20, 20', and the required lengths are set in the inner position of the presser beams 20, 20', respectively, from directly above the upper ends 11, 11' of the presser beams in the longitudinal direction (welding line direction). interval (e.g.
Provide a misalignment adjustment screw 21 with a pitch of 250 to 300 mm). Also, rails 23, 2 for running the automatic welding machine 22 on the upper presser beams 19, 19'.
3' is provided. Further, the lower support beams 4, 4' and the upper presser beams 19, 19' are fixed by clamp devices 24 at their longitudinal ends. In the figure, reference numeral 25 indicates a support leg that supports the materials to be welded 1, 1'.

Prior to welding the steel plate blocks, first, the lower welding support device A is set on the ground. At this time, the pressure inside each air hose 17, 18 is released and contracted, and the backing materials 14, 15 are
Supported by 2.

In this state, the materials to be welded 1, 1' are placed on the lower support beams 4, 4' and the support leg 25, and the groove 2
is aligned with the concave portion of the copper pad 15. Next, the upper presser beams 19, 19' are placed on the materials to be welded 1, 1', and the positions are adjusted so that they are parallel to the groove 2 and the rails 23, 23' match the wheel spacing of the automatic welding machine 22. Then, both ends of the upper support beams 19, 19' are secured to the lower support beams 4, 19' by the clamping device 24.
Fix it at 4'.

Next, compressed air 16 (1
~2Kg/cm ² ) is supplied to expand the upper end 1 of the pressing beam 10 through the intermediate plate 7.
1 and 11' are pressed against the back surface of the materials to be welded 1 and 1'.
As a result, the materials to be welded 1 and 1' are fixed in a state where their surfaces are aligned.

Next, compressed air 16 (0.3
~0.7 Kg/cm ² ) is supplied to expand the asbestos, and the pressure lifts the backing materials 14 and 15 through the asbestos 12 and crimps the copper dowel 15 along the weld line.

By performing automatic welding on one side using the automatic welding machine 22 in this state, it is possible to perform good welding of the unintentional Uranami bead. Also, during welding work, thermal deformation of the welded materials 1 and 1' may cause groove misalignment, but this can be easily corrected by adjusting the misalignment adjusting screw 21 during welding. Prevention can be carried out.

Furthermore, by changing the shapes of the lower welding support device, the upper presser beam, etc., steel plate blocks can be suitably welded regardless of whether they are flat or curved.

It should be noted that the present invention is not limited only to the above-mentioned embodiments, and it goes without saying that the shape of each component may be changed in various ways, and that various other changes may be made within the scope of the gist of the present invention. It is.

As mentioned above, according to the welding support device for a steel plate block of the present invention, the following excellent effects can be achieved.

(i) It is possible to omit all manual work by the worker on the lower surface of the material to be welded, thereby greatly improving workability and work efficiency.

(ii) Regardless of whether the shape of the material to be welded is flat or curved, suitable welding can be performed by using a device that matches the shape.

(iii) Since the pressing beam and backing material are pressed by expanding the air hose, uniform pressing force can be obtained.

(iv) Since the upper presser beam with the misalignment adjustment screw is placed above the material to be welded, misalignment that occurs during welding can be prevented.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an example of a conventional system, FIG. 2 is a cutaway front view showing an embodiment of the present invention, and FIG. 3 is a perspective view showing an example of the overall shape of the present invention. 1 and 1' are the materials to be welded, 2 is the groove, 4 and 4' are the lower support frame, 6 is the guide beam, 7 is the intermediate plate, 1
0 is a pressing beam, 11 and 11' are upper ends, 12 is asbestos, 14 is glass tape, 15 is a copper dowel, 16 is compressed air, 17 and 18 are air hoses, 19 and 19' are upper holding beams, 21 22 is an automatic welding machine, and A is a lower welding support device.

Claims (1)

[Claims] 1 A lower support beam is provided at a required interval so as to separately support two pieces of workpieces with their grooves butted against each other at the upper part, and an air hose is expanded and contracted between the lower support beams to raise and lower the parts. a pressing beam whose upper end portions on both sides can be pressed against the lower surface of each of the materials to be welded; asbestos for supporting a backing material provided between the upper end portions of the pressing beam; an air hose capable of pressing and supporting the backing material against the welding line on the lower surface of the welded material through the asbestos through expansion and contraction; 1. A welding support device for a steel plate block, comprising: an upper presser beam fixed to a support beam; and an offset adjusting screw arranged at a required interval in the longitudinal direction of the upper presser beam.