JP2646024B2 - Arc welding method and apparatus - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an arc welding method and apparatus for generating an arc between a non-consumable electrode and a workpiece to weld workpieces having greatly different thicknesses. .

[Conventional technology]

An ultra-thin metal plate generally called a foil having a thickness of about 10 μm to 100 μm or a metal net having a fine mesh, for example, a stainless steel foil and a metal plate having a thickness of about 0.2 mm to 3.0 m, such as a steel plate, are used. In the case of welding, as shown in FIG. 5, after the foil 1 and the steel plate 2 which are the objects to be welded are cut into a required shape, the screens of the foil 1 and the steel plate 2 are uniformly adjusted. The foil 1 and the steel plate 2 are clamped by the holding plates 3, 3 ', and a plasma torch 4 having a non-consumable electrode such as a cathode rod made of tungsten material or the like is caused to travel and a plasma arc is generated from the plasma torch. A method of welding the side surfaces of the foil 1 and the steel plate 2 with a simple arc was common.

[Problems to be solved by the invention]

However, in the conventional arc welding method and apparatus,
There were the following disadvantages.

(1) Since the thickness of the foil 1 to be welded and the steel plate 2 are greatly different from each other, it is difficult to balance heat, and the thinner foil 1 to be welded is melted.

(2) Since the side surfaces of the foil 1 and the steel plate 2 to be welded must be uniformly aligned, the cut surfaces of the foil 1 and the steel plate 2 are required to have high precision.

(3) When the foil 1 to be welded and the steel plate 2 are clamped, the foil 1 warps as shown in FIG.
A gap is created at the welding location between the foil 1 and the steel plate 2. In order to prevent this, if the holding plates 3, 3 'are brought close to the welding point of the foil 1 and the steel plate 2, an arc is connected to the holding plates 3, 3', and stable welding cannot be performed.

[Means for solving the problem]

SUMMARY OF THE INVENTION In order to eliminate the above disadvantages, the present invention relates to an arc welding method for generating an arc between a non-consumable electrode and a workpiece to weld the workpieces having greatly different thicknesses. Is superimposed on the thin-welded part, and an arc is applied along the side of the thick-welded workpiece, so that the thin-thick workpiece is connected to the thin-thick workpiece. An arc welding method characterized by welding while fusing into a shape, and an arc welding apparatus for generating an arc between a non-consumable electrode and a workpiece to weld workpieces having greatly different thicknesses. A thin work piece placed on the thin work piece, a thick work piece superimposed on the thin work piece, and a side face of the thick work piece. Arc welding characterized by comprising a plasma torch for applying an arc There is provided an apparatus.

[Action]

According to such an arc welding method and apparatus, since the thin workpiece can be welded while being melted into the shape of the thick workpiece, all unnecessary portions are removed. Thus, the object to be welded can be easily welded into a shape that is preferable in appearance.

〔Example〕

FIG. 1 is a diagram for explaining one embodiment of the present invention. As shown in FIG. 1, a foil 1 and a steel plate 2,
Are placed so that the foil 1 is on the lower side and the steel plate 2 is on the upper side, and placed on the receiving table 6 on which the backing plate 5 is disposed. At this time,
The holding plate 3 'is stopped at the center of the backing plate 5, and the side surface of the steel plate 2 is formed with a groove having a width of, for example, 1 mm in the center of the backing plate 5 by abutting the steel plate 2 against the holding plate 3'. Located in the center of the back groove 7. Next, the pressing plate 3 is pressed,
The steel plate 2 and the foil 1 are clamped simultaneously. The width of the clamp shall be variable according to the thickness of the steel plate 2.
A scale 8 engraved on the backing plate 5 as shown in the figure is used. After the steel plate 2 and the foil 1 are simultaneously clamped by the holding plate 3, the holding plate 3 'is retracted to the required clamp width,
Clamp. The clamp width of these holding plates 3, 3 'is
The holding plate shall be close to the limit that does not interfere with the arc column emitted from the nozzle at the tip of the plasma torch 4.
Insulation coating is applied to the surfaces of 3, 3 'and they are clamped by air pressure. When the plasma torch 4 is run along the side surface of the steel sheet in such a state, the plasma torch 4 is tied to the side surface of the steel sheet 2 stacked on the arc foil 1 coming out of the plasma torch 4 and moves while melting this portion. I do. At this time, since the thermal energy for melting the side surface of the steel sheet 2 is, of course, sufficient to melt the lower foil 1, the foil 1 melts right and left and separates, and the foil 1 on the lower side of the steel sheet 2 is separated. Melts with the side surface of the steel plate 2 to form a weld bead. After the arc stops, the clamps on the holding plates 3, 3 'are released, and welding is completed. FIG. 3 is a view showing the work to be welded after the welding is completed, and shows a state in which the foil 1 and the steel plate 2 are welded by the welding beads 9. The foil 1 and the steel plate 2 thus welded are opened to open the foil 1 and the steel plate 2.
And the same result as in the butt welding can be obtained.

FIG. 4 is a diagram for explaining another embodiment of the present invention. This figure shows a jig for welding the foil 1 to the surface of the circular steel plate 2. By fixing the foil 1 and the steel plate 2 to be welded and rotating the plasma torch 4 along the circumference of the steel plate 2, the foil 1 is blown into the shape of the circular steel plate 2 while one side of the steel plate 2 is melted. Can be welded.

As described above, according to the present invention, the foil and the steel sheet can be welded by superimposing the foil and the steel sheet and moving the plasma torch straight or circumferentially along the shape of the steel sheet. It is not necessary to cut the steel sheet into the shape of the steel sheet in advance, and with the streamlining of the work, the welding of the steel sheet of different sizes with the foil, which has been difficult so far, becomes possible.

(1) Although it is inexpensive like a steel plate, it is particularly effective when a foil such as stainless steel is bonded to a material easily rusted and easily stained by welding and used as a decorative plywood or a corrosion-resistant plywood.

(2) By making a tube with the stainless steel foil of the plywood thus made inside, the inner surface can be used as a special pipe of stainless steel foil.

(3) Depending on the purpose of use, the foil may be bonded to both sides of the steel plate by welding to be used as a decorative plywood or a corrosion-resistant plywood whose entire surface is made of stainless steel.

In the above embodiment, the case where the workpiece is fixed and the plasma torch 4 is run has been described. However, the same is also possible by fixing the plasma torch 4 and running the workpiece. Can be implemented.

〔The invention's effect〕

As described above, the present invention relates to an arc welding method of welding arcs between non-consumable electrodes and an object to be welded to weld objects having greatly different thicknesses. By overlaying on a thin work piece and applying an arc along the side of the thick work piece,
An arc welding method characterized in that the thin workpiece is welded while being blown into the shape of the thick workpiece, and an arc is generated between the non-consumable electrode and the workpiece. In an arc welding apparatus for welding workpieces having greatly different thicknesses, a thin workpiece mounted on a pedestal and a thick workpiece superimposed on a thin workpiece. An arc welding apparatus comprising: a welded article; and a plasma torch for applying an arc along a side surface of the thick workpiece.

Since the present invention has such features, the thin workpiece can be welded while being blown into the shape of the thick workpiece, so that all unnecessary portions can be removed. In addition, the object to be welded can be easily welded into a preferable shape in appearance. Further, the productivity is remarkably improved as compared with the conventional method, and the method is economical.

[Brief description of the drawings]

1 to 3 are diagrams for explaining one embodiment of the present invention, FIG. 4 is a diagram for explaining another embodiment of the present invention, and FIG. 5 is a diagram for explaining a conventional example. FIG. DESCRIPTION OF SYMBOLS 1 ... foil, 2 ... steel plate 3, 3 '... holding plate 4, ... plasma torch 5 ... backing plate, 6 ... pedestal 7 ... back groove, 8 ... scale 9 ... welding bead

Claims (4)

(57) [Claims] An arc welding method for generating an arc between a non-consumable electrode and a workpiece to weld the workpieces having different thicknesses to each other. By overlapping the workpiece and applying an arc along the side of the thick workpiece, it is possible to weld the thin workpiece while fusing it in the shape of the thick workpiece. Characterized arc welding method. 2. An arc welding apparatus for welding two workpieces having different thicknesses by generating an arc between a non-consumable electrode and a non-welding workpiece. An object, a thick object to be superimposed on the thin object to be welded, and a plasma torch for applying an arc along a side surface of the thick object to be welded. Arc welding equipment. 3. An arc welding apparatus for welding two workpieces having different thicknesses by generating an arc between a non-consumable electrode and a workpiece to be welded. A workpiece, a thick circular workpiece to be superimposed on the thin workpiece, and a plasma rotating while applying an arc along a circumferential side surface of the thick workpiece. An arc welding apparatus comprising a torch. 4. An arc welding apparatus for welding objects having different thicknesses by generating an arc between a non-consumable electrode and an object to be welded. An arc strikes the workpiece, the thick circular workpiece overlaid on the thin workpiece, the plasma torch, and the circumferential side of the thick workpiece. An arc welding apparatus comprising a rotating base.