JPS61165276A - Arc welding method - Google Patents

Abstract

PURPOSE:To increase a welding speed and to improve welding efficiency by oscillating relatively a filler metal supplied to a torch electrode of arc welding to apply a stirring effect to a molten pool thereby preventing the local cooling of the molten pool and improving the welding. CONSTITUTION:The filler wire 4 supplied to the torch 6 electrode of an arc welding device is relatively oscillated by a slider 10. The stirring effect is provided to the molten pool 2 by the oscillating wire 4, by which the local cooling of the molten pool is prevented and the molten pool is uniformly cooled to form a satisfactory weld zone. The melting speed of the wire 4 is increased by the stirring to improve the welding efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an arc welding method that improves the quality and efficiency of welding.

[Conventional technology]

In arc welding, stirring of molten metal has the effect of separating the molten metal from impurities and gases in the metal, and preventing separation of the molten metal from the base metal, improving welding quality. This is element 1.

Conventional stirring of molten metal relies on the stirring effect of arc force. For example, vibrations of molten metal due to fluctuations in arc force,
Some types even more actively vary the strength of the arc current and fluctuate the arc force by moving the arc with the on-rate.

Pulsed arc welding is a method of varying the arc force. In the pulsed arc welding method, a welding current is applied to an electrode in a pulsed manner, and the intensity of arc generation is varied. FIG. 6(a)(0) shows the behavior of the arc (1) and the pool (molten metal) (2) in pulsed arc welding. In the figure, (3) indicates an electrode, and (4) indicates a filler wire. Figure 6 (A) shows the peak current. At peak current, the arc (1) becomes strong and presses against the pool (2), and at base current, the arc (1) becomes weak and the pool (2) presses against it. It swells due to surface tension. Therefore, the pool is agitated by repeated vertical movements due to the arc force.

[Problem that the invention attempts to solve]

However, in the above conventional method, the pool is stirred only by the arc force, which is not sufficient, and the positional relationship between the electrode (3) and the filler metal (4) is fixed, that is, the filler metal (4) is in a fixed position relative to the pool (2). Since the insertion position is constant, there is a risk that the filler metal insertion position of the pool may be locally cooled and cause welding defects.

[Means for solving problems]

The present invention has been made to solve the problems of the prior art described above, and is designed to insert a filler metal into a pool while applying vibration relative to the electrode.

[For production]

The pool vibrates following the vibration of the filler metal relative to the electrode, improving the stirring effect, and since the insertion position of the filler metal in the pool changes every moment, local cooling by the filler metal is prevented.

〔Example〕

The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an example of a device for carrying out the present invention, in which (5) is the welding cart body, (6) is the torch, and (3) is the welding cart body.
(4) shows the fin wire, the bogie body (5)
An oscillating slider (7) is attached to the oscillating slider (7) so as to be able to reciprocate in the lateral direction with respect to the traveling direction of the bogie, and a 1/-ti block (8) is attached to the oscillating slider (force) via an arc voltage control unit (9). The slider (10) is attached to the 1-chi block (8) and the on-rate slider (
A wire holder (11) is attached to the slider (10) via an arm (12).

When welding facing the
Oscillate with the required amplitude and vibration, and use the slider (10
) to reciprocate (vibrate). 2, the electrode (3) is oscillated with an amplitude corresponding to the bead width [l The fin wire (4) is also made to oscillate with respect to the electrode (3) (see FIG. 2(a)). As the fin wire (4) moves (moves the fin wire feeding position), the pool (2) also behaves as shown in FIGS. 2(A) and 2(B).

That is, the stirring effect caused by the pool (2) following the movement of the fin wire (4) is added to the stirring effect of the arc (1). Moreover, the insertion position of the fin wire (4) with respect to the pool (2) changes every moment, thereby preventing local cooling of the pool (2).

In the above embodiment, the fin wire is vibrated in the left and right directions with respect to the traveling direction, but it may also be vibrated in the vertical direction, the front and rear directions, or a combination of these vibrations.

〔Effect of the invention〕

As described above, according to the present invention, the welding quality can be improved by increasing the stirring effect (~), local cooling of the pool is prevented, welding defects can be prevented, and fins are always placed in the high temperature position of the pool. Since the wire is fully inserted, excellent effects such as an increase in the melting rate of the fin wire and an improvement in welding efficiency of -11 are achieved.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing an example of a device for implementing the present invention, Fig. 2 (a), (b), and (c) are explanatory diagrams showing the relationship between the fin wire and the pool, and Fig. 3 (a). (b) is an explanatory diagram showing the relationship between an arc and a pool in pulsed arc welding. (1) is the arc, (2) is the pool, (3) is the electrode, (4
) indicates fin wire.

Claims (1)

[Claims] 1) An arc welding method characterized by inserting the filler metal into a pool while applying vibration relative to the electrode.