Title:
GAS METAL ARC WELDING METHOD
Document Type and Number:
Japanese Patent JPS6072679
Kind Code:
A
Abstract:
A gas-metal-arc welding method is provided for high speed, high melting rate, substantially spatter-free, all-position welding. The method is particularly useful for out-of-position welding, that is, to produce vertical, inclined and overhead welds. A consumable wire electrode is held within and fed through the tubular contact tip of a continuous feed type welding gun having a tubular nozzle surrounding and extending beyond the tip. A shielding gas, formed of unique ratios of a minor proportion of a carbon dioxide and oxygen mixture combined with a major proportion of an argon and helium mixture, is flowed in a substantially longitudinally laminar pattern between the nozzle and contact tip and along the electrode extension from the tip. The contact tip is cooled, and sufficiently high power electrical current is passed through the contact tip and electrode extension to produce the arc and to melt the end of the electrode into molten drops for short-circuiting (e.g., low current) or for spray (e.g., higher current) transfer of the drops to the weld deposit. The electrode extension is pre-heated by maintaining a long electrode extension or stick-out beyond the contact tip end, with a substantial portion of the extension recessed within the nozzle.
More Like This:
Inventors:
JIYAN KUROODO RUBERU
Application Number:
JP18086684A
Publication Date:
April 24, 1985
Filing Date:
August 31, 1984
Export Citation:
Assignee:
PII PII AI PAFUOOMANSU PROCESS
International Classes:
B23K9/173; B23K9/235; B23K9/16; B23K35/38; (IPC1-7): B23K9/16
Attorney, Agent or Firm:
Yu Saito