JPH0375270B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a narrow gap welding device, and more particularly to a welding device that can accurately swing a wire fed to a welding part.

MIG welding is a welding method in which an electrode wire, which is a filler metal, is continuously fed to generate an arc, and the wire has a specific bending tendency within the groove. The inventors have previously proposed a method of performing uniform oscillation by swinging the oscillator from side to side.

FIG. 1 shows an outline of the method proposed by the inventors. In the figure, wire 1 wound on reel 1
0 is a bending roll 3 consisting of two rollers, which removes curls caused when the wire 10 is wound onto a reel by a wire strainer 2 consisting of rollers 2a, 2b, and 2c, or the original tendency of the wire 10. be supplied to While the bending roll 3 supplies the wire 10 to the feed roll 4 side,
The self reciprocates at positions 3 and 3',
Add a specific habit to the wire 10. This wire 10
passes through the feed roll 4 and the welding torch 5, and the tip of the torch swings left and right depending on the shape of the torch, thereby uniformly oscillating the arc 6.

However, it is impossible to remove all the kinks from the wire 10 in the wire strainer 2, and since there is a considerable distance between the reel 1 and the torch 5, unnecessary kinks may occur in parts other than the bending roll 3. Sometimes it sticks. In order to achieve high-quality welding with sufficient penetration into the base metal wall surface, the swing center line 8 of the wire 10 and the groove center line 11 are
It is necessary for the arc to oscillate evenly on both side walls. In other words, when the wire 10 has a precise curl, by placing the torch 5 at the groove center 11, the wire 10 has a wave-shaped curl by the bending roll 3.
0 center line (hereinafter referred to as "bending center") 8 coincides with the groove center 11, making it possible to oscillate evenly. However, if the wire 10 has an unnecessary habit, the wire 10 will not swing at the expected position, and the center of the swing will be displaced to the position 8 in FIG. 2, for example, resulting in an even oscillation rate. It becomes impossible. Conventionally, when such a situation occurs, the welding operator has to deal with it by changing the position of the torch within the groove, or in some cases tilting the torch. However, since deviating the torch 5 from the center of the groove itself causes deterioration in welding quality, it did not fundamentally solve the problem.

The present invention has been constructed in view of the above-mentioned problems, and an object of the present invention is to provide a welding device that can consistently perform high quality welding.

In short, the present invention provides a welding device in which a welding wire is bent by a bending roll and an arc is oscillated by the bending roll. A narrow gap MIG characterized in that a swinging device equipped with a moving bending roll is provided, and the bending roll swinging device is provided with a position adjustment means for displacing the swinging center line with the axis of a welding torch. It is a welding device.

Examples of the present invention will be described below.

In FIG. 3, 12 is a plate on which the bending roll 3 is attached so that it can move back and forth, and 7 is an adjustment knob attached to this plate 12. By rotating this adjustment knob 7, the plate 12 itself is moved in a manner substantially perpendicular to the center line of the torch 5, thereby displacing the bending center 8 from the center line 14 of the torch 5. For example, the center of swing of the wire coming out of the torch 5 is 8 in Figure 2.
If the bending center 8 is to be moved to the position shown in FIG. 4, the adjustment knob 7 is moved to the position shown in FIG. In this case, the torch 5 itself is always positioned on the groove centerline 11. In this embodiment, the wire strainer is omitted in order to deal with the curling of the wire by displacing the bending center, but the wire strainer may of course be left attached.

By carrying out this invention, the displacement of the swing center of the wire can be corrected while the welding torch is always positioned on the groove centerline, so high quality welding can always be performed.

[Brief explanation of drawings]

1 is a side view of a conventional welding device, FIG. 2 is a schematic diagram of FIG. 1, FIG. 3 is a side view of a welding device according to the present invention, and FIG. 4 is a schematic diagram of FIG. 3. 3...Bending roll, 5...Welding torch, 7...Center adjustment knob, 14...Welding torch center.

Claims (1)

[Claims] 1. In a welding device that bends a welding wire with a bending roll and oscillates an arc using the bending roll, a welding torch and a feed roll are provided in a fixed relative position, and the bending roll swings above the feed roll. 1. A narrow gap MIG welding device, comprising: a swinging device equipped with a roll; and a position adjusting means for displacing the centerline of the bending roll from the axis of a welding torch.