Welding Copper Pipe With Tig. For this reason no one set of welding conditions will cover all groups. Since the predominant application of copper-nickels is in the form of relatively thin-walled pipe the gas-shielded tungsten-arc welding process known as TIG or GTAW is frequently used both for joining pipe sections and for attaching fittings and flanges.
Trick is to go slow frequent cooling of the parts and about 20 years of experience making two pieces of metal one. Tig welding copper pipe. A welding procedure specification WPS should be prepared in all cases.
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You can approximate using 10 of DCEN current eg for a 18 tungsten where a current of 150-400 amps can be. Stocks in huge qty. The puddle is sluggish and doesnt like to flow. You havent given much detail on what you are welding but in general turn your heat up about 20 0 30 amps higher than you would for SS.