Consumable electrode type pulse arc welding method

Details Consumable electrode type pulse arc welding method Consumable electrode type pulse arc welding method

1999-06-15

2001-03-27

Shaw, Clifford C. (Department: 1725)

Electric heating

Metal heating

By arc

C219S1370PS

Reexamination Certificate

active

06207928

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a consumable electrode type pulse arc welding method by which welding is conducted in such a manner that at least one of the welding current and the welding voltage is superimposed like pulses between a welding wire and a welding base metal (work).
2. Description of the Related Art
Conventionally, in this type pulse arc welding method, an arc of pulse arc welding is started by using the same pulse parameter as that of main welding from the start of welding.
However, when an arc of welding is started by the same pulse parameter as that of main welding, short circuit is irregularly caused because of an unstable arc at the start of arcing. Due to the foregoing, a period of time of short circuit is extended, and big pieces of spatter are generated, or the arc is suddenly cut off. Further, a change in the welding current per unit time at the rise and fall of pulses is so sharp that a value of the change is ±1000 to 1400 A/msec. Therefore, a magnetic arc blow occurs, and the arc becomes unstable. Accordingly, it is impossible to form proper welding beads.
SUMMARY OF THE INVENTION
The present invention has been accomplished to solve the above problems, and therefore an object of the present invention is to provide a consumable electrode type pulse arc welding method by which the occurrence of a magnetic arc blow is suppressed when short circuit, which has been irregularly caused in the process of starting an arc, is released in a short period of time, so that the arc can be prevented from cutting off and stabilized early and proper beads of welding can be formed.
In order to accomplish the above object, a consumable electrode type pulse arc welding method of the present invention comprises: a first step for setting the welding current at a value lower than that of main welding in a first period of time which is a predetermined period of time from the start of welding; and a second step for increasing a setting value of the welding current to a value of main welding after the first period of time has passed. In this consumable electrode type pulse arc welding method, until the first point at which a setting value of the welding current reaches a predetermined setting value in the second step, not pulse welding but short circuit shift welding is conducted.
Also, in this consumable electrode type pulse arc welding method, a consumable electrode type pulse arc welding method comprises: a first step for setting the welding current at a value lower than that of main welding in a first period of time which is a predetermined period of time from the start of an arc; and a second step for increasing a setting value of the welding current to a value of main welding after the first period of time has passed, wherein an inclination of pulses is decreased from the start of an arc to the end of the second step.
In a consumable electrode type pulse arc welding method, a predetermined voltage is added to the welding voltage setting value and the thus obtained welding voltage setting value is outputted.
In a consumable electrode type pulse arc welding method, an inclination of pulses is decreased in the second step after welding has passed through the first point.
In a consumable electrode type pulse arc welding method, an inclination of a short circuit current is increased in the case of short circuit in the second step.


REFERENCES:
patent: 3588466 (1971-06-01), Daggett
patent: 4390954 (1983-06-01), Manning
patent: 4507543 (1985-03-01), Ukai et al.
patent: 4560857 (1985-12-01), Segawa et al.
patent: 5017757 (1991-05-01), Kawai et al.

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