Abstract
Effect of nitrogen partial pressures in the welding atmospheres of several gas mixtures on the nitrogen content of aluminum weld metals was systematically studied.The important conclusions are as follows;1. Aluminum weld metals absorb a large quantity of nitrogen in the welding atmospheres containing nitrogen.2. The nitrogen contents of weld metals increase with increasing arc voltage and decrease with increasing welding current.3. Anomalous nitrogen absorption by weld metal is observed at low atmospheric pressures.4. The existence of an oxidizing gas in arc atmospheres does not contribute to the enhancement of nitrogen absorption by aluminum weld metals.
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