PURPOSE:To obtain an Al alloy welding material having excellent stress corrosion cracking resistance by forming said material of a compsn. having a specific ratio each of Mg, Mn, Zr, Cr, Ti, and B and consisting of the balance Al and unavoidable impurities. CONSTITUTION:The Al alloy is made of the compsn. contg. 2.1-2.9wt% Mg, 0.4-1.0wt% Mn, 0.10-0.35wt% Zr, 0.10-0.35wt% Cr, 0.05-0.25wt% Ti, and 0.001-0.01wt% B and consisting of the balance Al and unavoidable impurities. The Al alloy made of the above-mentioned compsn. is melted by an ordinary melting method and is cast and is further molded to a welding wire. MIG welding and TIG welding are executed by using such welding wire. The effects including the excellent stress corrosion cracking resistance, small sensitivity to high-temp. cracking and excellent feedability of the wire are obtd. by using such Al alloy welding material.
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