Pulse welding process

Details Pulse welding process Pulse welding process

1979-08-23

1981-06-16

Shaw, C. C.

Electric heating

Metal heating

By arc

21913051, B23K 909

Patent

active

042739888

ABSTRACT:
A gas-shielded, metal-arc, pulse welding process which comprises establishing an arc with a consumable metal electrode in a gas-shielded environment. A direct current in the range of from about 15 to 80 amps is applied to the electrode and pulsated at a frequency of from about 5000 to 25,000 pulses per second to a first maximum amplitude of from 100 to 125% of the minimum current required to produce a spray transfer of metal from the electrode. The pulsating current applied to the electrode is cyclically increased at a frequency of from about 90 to 400 cycles per second to a second maximum amplitude of from about 150 to 600% of the minimum current required to produce a spray transfer of metal from the electrode and is maintained at the second maximum amplitude for a time within the range of from 5 to 50% of each cycle. The process is particularly applicable to automatic welding processes wherein the weld must be accomplished out-of-position. In accordance with the present invention, the deposition rate is greatly enhanced in such a process without any detrimental effect on the quality of the weld.

REFERENCES:
patent: 3249735 (1966-05-01), Needham
patent: 3528100 (1970-09-01), Budy
patent: 3781511 (1973-12-01), Rygiol
patent: 3818176 (1974-06-01), Brown
patent: 3956610 (1976-05-01), Kanbe et al.
patent: 4019016 (1977-04-01), Friedman et al.
F. Rienks et al., "Development and Evaluation of a Modulated Power Control for Fusion Welding" Welding Research Supplement, pp. 222-S-230-S, 5/1971.

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