Micro-arc welding/brazing of metal to metal and metal to ceramic

Details Micro-arc welding/brazing of metal to metal and metal to ceramic Micro-arc welding/brazing of metal to metal and metal to ceramic

1981-03-26

1983-09-13

Shaw, C. C.

Electric heating

Metal heating

By arc

219 75, 219127, B23K 900

Patent

active

044044569

ABSTRACT:
Method and apparatus for micro-arc brazing and welding of metal to metal or ceramic. The control of arc heat flux density is accomplished by controlling the ambient gas pressure and providing an argon, argon/5% hydrogen or other inert gas atmosphere. The discharge current is controlled so as to provide an arc which is operable at 100 microamps to 20 amps.
Prior to welding or brazing, the work is cleaned by high frequency electrical discharge cleaning techniques using high energy ions from either the ambient gas or from an electrode. By providing a small amount of DC during the high frequency discharge a "tinning" capability is established.
The welding or brazing may be formed in a closed chamber so that arc stabilization can be accomplished.

REFERENCES:
patent: 3366772 (1968-01-01), Wickham et al.
patent: 3471675 (1969-10-01), Sargent et al.
patent: 3487195 (1969-12-01), Denis et al.
T. Lyman et al., Metals Handbook, 8th Edition, vol. 6, "Welding & Brazing", pp. 113-126, 1971.

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