Nitrogen Content and Porosity in Aluminum and Titanium Welds

概要

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Aluminum and titanium were welded in controlled arc atmospheres. Effect of nitrogen partial pressures in the welding atmospheres of N_2, N_2-Ar, N_2-O_2, N_2-CO_2 and N_2-H_2 on the nitrogen content and porosity of weld metals was systematically studied. Aluminum and titanium weld metals absorb a large quantity of nitrogen in the atmospheres containing nitrogen. The nitrogen content of weld metals increases with increasing arc voltage and decreases with increasing welding current. Anomalous nitrogen absorption in aluminum and titanium weld metals is observed at low atmospheric pressures as in mild steel and stainless steel weld metals. The existence of an oxidizing gas in arc atmospheres does not contribute to the enhancement of nitrogen absorption by aluminum and titanium weld metals.
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