JPS61176490A - Butt method in welder - Google Patents

Abstract

PURPOSE:To perform a stabilized welding without defective welding due to differential step nor notch effects by working aslant the butt upper face of a thicker plate, in case of there being plate thickness difference between a preceding plate and succeeding plate in a butt welder. CONSTITUTION:The upper part of the end of preceding strip plate 4a and succeeding strip plate 4b is cut aslant by cutting tools 7a and 7b after shear cutting of the end part of the preceding strip plate 4a and succeeding strip plate 4b. The locating (cutting quantity) of the cutting tools 7a, 7b is performed with the plate thickness of thinner part as the standard. After cutting, the weld is performed with the butt of both strip plates 4a and 4b each other.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for butting strips of a butt welding T-47 laser welding machine or the like.

[Conventional technology]

FIG. 9 is a sectional view showing a conventional butt welding machine shown in, for example, Japanese Unexamined Patent Publication No. 59-1091, from the cutting process of the leading and trailing band plates to the butt welding process.
In the figure, (1) is the double cutter upper blade, (la)
and (lb) d double cutter lower blade, (21 and 131 ri clamp device, (4a) leading strip plate, (4
b) h trailing band plate, (fil is center clamp, (6)
is a welding torch.

Next, the operation will be explained. In order to butt weld the leading strip plate (4a) and the trailing strip plate (4b), as shown in FIG. Clamp at +31 and
As shown in the figure, it is cut with a double cut shear (11).

After that, Double Cut Sha (the river was evacuated, Figure 9 101)
), the strip plates (4a) and (4b) are butted against each other as shown in Fig. 9 1111, and the center clamp (5) is arranged so as to be in contact with the back side of the groove as shown in Fig. 9 1et. ), welding torch +61′t along the Susaki line
- Run and weld (see Fig. 9 (fl)).

[Problem that the invention seeks to solve]

Conventional butt welding machines are configured as described above, so when using filler wire for welding where the thickness of the strips is different, the filler wire is used for thick strips. There were problems such as deviation from the center of the groove, resulting in poor welding.

This invention was made to solve the above-mentioned problems, and its overall purpose is to eliminate the level difference in the butt weld and to perform welding that can maintain more stable welding quality.

[Means for solving problems]

The butting method in the welding machine according to the present invention is such that the butting upper part of the leading and trailing strips cut by the double cut shear is pre-cut diagonally before welding.

[Effect]

In this invention, the butted upper portions of the strip plates are first cut using a cutting device and then welded, so that there is no step difference in the welded portion due to the difference in plate thickness.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a butt welding machine in one embodiment of the present invention. In the figure, 11] is the upper blade of the double cutter, (la) the lower blade of the double cutter on the preceding strip side, (
2) is the clamping device on the leading strip side, (4a) is the leading strip, (6) is the welding torch, (7) is the cutting device, (8) is the cutting waste receiving box, +91 tri double cut shear frame, It is a tto+fi Radbeam oscillator.

Next, the operation of the laser welding machine configured as described above will be explained. When the shear cut surface as shown in FIG. 8 is completely retracted from the frame (9), the cutting tools (7a) and (7b) are used to cut the leading strip (4a) and the trailing strip. Cut the upper part of (4b) diagonally. Cutting tool (7
The positioning (cutting amount) of a) and (7b) is performed using the preceding strip plate (4a
), the thickness of the trailing band plate (4b) is Tb, and the thickness of the trailing band plate (4b) is Tb.
Ta) In the case of Tb, the plate thickness T of the trailing band plate (4b)
) Positioning is performed using the t-reference.

Each strip (4a)/(4t+) #'i Butt each other,
When using the O filler wire (11) to be welded, the filler wire (11) is generally moved in the welding direction (11) as shown in Figure 4.
It is supplied from the side (in the direction of the arrow). In addition, as shown in Fig. 5, the band plates (4a) and (411) #
-! The molten metal H and the solidified metal I are welded, but the filler wire (11) #-11 is supplied to the sides of the strips (4a) and (4b) that have not yet been melted. Therefore, in conventional butting, the strip plate (+a)・(4b
) If there is a difference in the thickness of the O plate, the filler wire (11) will deviate from the welding area as shown in FIG. 6, resulting in poor welding. In the present invention, as shown in FIG. 7, filler wire (11) #'j is located at the center of welding,
11) There will be no welding defects caused by deviation from the welded area.

In addition, as shown in Fig. 8, even if there is no difference in thickness between the strip plates (4a) and (4b), supply of the filler wire (el) can be made more stable by lining the tops of both (
Become.

In the above embodiment, the cutting device (7) is attached to the upper blade +11 side of the double cutter, but it may be integrated with the cutting waste receiving box (8). Cutting tool (7a)/(Tb) A d-bit, a rotary blade such as an end mill, or a grindstone may be used.

The cutting tools (7a) and (7b) may be in one or more pairs.O The cutting shape may be not only a straight line but also a circle.

Furthermore, although the Rede welding machine has been described above, the present invention is not limited to the Rede type but can be applied to various types of butt welding machines.

〔Effect of the invention〕

As described above, according to the present invention, the step at the abutting portion of the strips is removed by cutting with a cutting device before welding, so there is an effect that welding defects and notch effects due to the step are eliminated.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a Rede welding machine for explaining one embodiment of the present invention, FIG. 3 is a side view after shear cutting, and FIG.
The figure is a side view during cutting, Figure 4 is a diagram of the positional relationship between the welding torch and filler wire, Figure 5 is a sectional view in the welding direction of Rede welding, and Figures 6 and 7 are strips with different plate thicknesses. FIG. 8 is a side view of the butt part in the conventional example and the embodiment shown in FIG. 8 when welding plates, respectively. FIG. Figure 9 (I
Ll, (b+, 101.1lll, (el and (f
+ is an explanatory diagram showing each process of a butting device according to a conventional example. In the figure, (4a) indicates the leading band plate, and (4b) indicates the trailing band plate. In the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] A butt welding machine such as a laser welding machine, which is characterized in that when there is a difference in thickness between the leading and trailing strips, the upper part of the butt of thick strips is processed diagonally. Matching method in .