Method and apparatus for determining stability of arc welding

Details Method and apparatus for determining stability of arc welding Method and apparatus for determining stability of arc welding

1998-10-20

2000-02-29

Shaw, Clifford C.

Electric heating

Metal heating

By arc

B23K 9095

Patent

active

060312033

ABSTRACT:
A method and apparatus for determining the stability of arc welding between a base metal and a welding electrode. A welding current for the arc period and a welding current for the short-circuit period fed from a welding power source are sampled every cycle of the repetition of arc and short-circuit, in accordance with a predetermined sampling frequency. The welding current for the arc period is integrated, and a standard deviation of the integrated welding current for the arc period is calculated. The standard deviation of the integrated welding current for the short-circuit period is calculated, as well. These standard deviations are multiplied together to produce a product, so that a welding stability parameter is calculated on the basis of the product. Then, the welding stability parameter is compared with a predetermined reference value. In response to the result of comparison, the welding stability between the base metal and the welding electrode is determined. A time ratio of the arc period and the short-circuit period may be calculated every cycle of the repetition of arc and short-circuit, and a standard deviation of the time ratio may be calculated. Then, the product may be multiplied by the standard deviation of the time ratio to calculate the welding stability parameter.

REFERENCES:
patent: 4103141 (1978-07-01), Wristen
patent: 4605836 (1986-08-01), Retfalvi et al.
patent: 5221825 (1993-06-01), Siewert et al.
patent: 5521354 (1996-05-01), Ludewig et al.
patent: 5750957 (1998-05-01), Kilty et al.
patent: 5756967 (1998-05-01), Quinn et al.

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