Arc welding method

Details Arc welding method Arc welding method

2005-06-14

2005-06-14

Shaw, Clifford C. (Department: 1725)

Electric heating

Metal heating

By arc

C219S130330, C219S1370PS

Reexamination Certificate

active

06906284

ABSTRACT:
The present invention relates to an arc welding method in which generation of spatters can be suppressed while the use quantity of gas to be supplied to a welding portion can be decreased. A welding wire8is brought into contact with a work W while applying a voltage between the welding wire8and the work W, so that the end of the welding wire8is caused to be fixingly welded to the work W. At this time, an electric resistance between the welding wire8and the work W is continuously obtained during the contact between the welding wire8and the work W, and thus, a minimum of the electric resistance is detected. When the current is temporarily reduced after the detection of the minimum of the electric resistance, the tip of the welding wire8hardly bursts, thus suppressing the expelling of molten particles, which may cause spatters, from the welding wire8. The minimum value is also used for the torch-to-workpiece distance control.

REFERENCES:
patent: 3792225 (1974-02-01), Needham et al.
patent: 5834732 (1998-11-01), Innami et al.
patent: 6087626 (2000-07-01), Hutchison et al.
patent: 59 202176 (1984-11-01), None
patent: 59 199173 (1984-12-01), None
patent: 08 229680 (1996-09-01), None
patent: WO 38870 (2000-07-01), None
PCT International Search Report (PCT/JP98/05923).

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