JPS59130687A - Arc welding method - Google Patents

Abstract

PURPOSE:To enable adjustment in the depth of penetration in the central part of a bead without spoiling the advantage intrinsic to a rotating arc welding method in the rotating arc welding method by performing welding while ejecting inert gas from the axial center of an electrode toward a molten pool. CONSTITUTION:A rotary electrode 1 is rotated and while a welding wire 2 is fed at a constant speed, an arc is generated at the tip of the wire 2 by the current from a welding power source 4, thereby rotating arc welding is performed. Inert gas 8 is blown simultaneously into the nozzle hole 6 at the axial center of rotation and the flow of the gas 8 is ejected from the aperture 6a of the nozzle to the surface of a molten pool 9. The molten metal in the central part of the pool 9 is thus depressed, thereby the depth of penetration in the central part of the bead is increased as desired.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an arc welding method L7, and particularly to a rotating arc welding method suitable for use in MIG welding or hiAG welding.

It has been proposed that rotor welding, in which the arc is rotated completely with an eccentric distance from the axis of the rotating electrode, is advantageous in dispersing the action of the arc over the entire periphery and forming flat beats. However, although it is true that the rotating arc bath welding method disperses the welding around the periphery and produces a flat pead shape,
It has been pointed out that there is a tendency for the welding in the center of the bead to be reduced too much.Therefore, in the present invention, without impairing the advantages of the rotary arc welding method of obtaining peripheral penetration and obtaining a flat bead, It is an object of the present invention to provide an improved method for MG or MAG, which allows control of the melting depth in the center of the bead.

That is, in the arc welding method of the present invention, arc welding is performed by blowing an inert gas from the electrode axis toward the molten pool from below the nozzle, and feeding the welding wire while circulating it around the axis. Yes, it can be applied to either MIG bath welding or MAG welding.

In the present invention, an inert gas is blown toward the nozzle from approximately the center part fJ) of the molten pool whose cross section has been flattened by a rotating arc. By adjusting -, it is possible to press the molten metal in the molten pool from the surface at the center with a desired force, and this pressing effect achieves correction of the bead shape, especially insufficient penetration at the center. .

To explain the present invention in detail with reference to the drawings, FIG. 1 shows the state of arc welding according to the present invention. This is an explanatory diagram schematically showing the tip of the L pole, in which (1) is a rotating electrode, (4 is a welding wire,
(6) is a shield gas nozzle, (40!g contact source, (5
) is the welding base material. The rotating electrode (1) is rotated in the direction of the arrow by a drive mechanism (not shown) inside the shield gas nozzle (3), and the nozzle hole (6) is inserted into the rotation axis, and the wire (2) is inserted into the eccentric position. A wire nozzle hole (force is provided). An inert gas (8) such as argon is fed into the nozzle hole (6) at an adjusted flow rate, and the air is directly below the nozzle opening (6a) at the lower end of the electrode (1). The shield gas nozzle (6) injects inert gas or CO2 gas to shield the welding part from the gap between the outer surface of the negative electrode (1) and the outer surface of the negative electrode (1). The gas ejected from the nozzle hole (6) is the same as the shielding gas on the outer periphery ffi, which is used as a general rule.

In the present invention, the welding wire (
2) is fed at a constant speed, an arc is generated at the tip of the welding wire (2) by the current from the welding power source (4), and rotary arc bath contact is performed, and at the same time, the nozzle hole (6)
An inert gas (8) is sent to the nozzle opening (6a) to blow an inert gas flow onto the surface of the molten pool (9) directly below,
This pushes down the molten metal in the center of the molten pool (9), and as a result, the welding depth in the center of the bead increases as desired.

The diameter of the nozzle opening (6a) is usually 1 to 1.51a.
mFf or so, and by adjusting the flow rate of the supplied gas (8), it is possible to control the wind pressure on the surface of the molten pool and, therefore, the welding depth at the center of the bead.

As described above, according to the present invention, the inert gas is blown from the center of rotation of the rotating arc to the entire molten pool directly below it to adjust the depth of welding in the center of the bead. Furthermore, it is possible to form a bead shape with a desired welding depth, and at the same time, it has the advantage of improving the gas shielding effect at the center of rotation of the rotating arc, further improving the stability of the arc, reducing spatter, and preventing spatter. It is important that it also contributes to improving hole properties.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram schematically showing the arc welding method of the present invention and the ultra-light end portion of the lamination. (1) Two rotating electrodes, (2): Welding wire, (3): Shield gas nozzle, (4): Welding power source, (5): Welding base material, (6): Nozzle hole, (6a): Nozzle opening, (7)
: Wire nozzle hole, (8) : Inert gas, (9) : Molten pool. Patent attorney Mitsuro Kimura Figure 1

Claims (1)

[Claims] An arc welding method in which an inert gas is blown downward from a nozzle from an electrode axis toward a molten pool, and a bath welding wire is fed while circulating around the axis.