Abstract
Studies were carried out to clarify the effects of several gases mixed to argon gas on appearance of bead, shape and depth of penetration, wettability of deposited metal, porosities in weld metal, and microstructure of weld metal in MIG welding of A5083 alloy. Mixing several volume % of oxygen gas to argon gas is effective for increasing the depth of penetration, improving wettability, and decreasing porosities. Mixing nitrogen gas leads to little improvement in in depth of penetration or wettability though it serves to minimize blow holes but not to the same extent as mixing oxygen gas. Mixing hydrogen gas to argon permits similar properties as those brought on pure argon gas except increasing porosities. Both the argon-carbon dioxide and argon-oxygen mixtures have similar consequences.
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