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Abstract
Hardness, tensile properties, and hot cracking susceptibility of Al–Li alloy 1441 were evaluated with respect to different filler alloys AA 2319, AA 4043, and AA 5356, as well as the parent alloys. The hardness in the as welded condition was 70–90 HV and improved by 20, 30, 40, and 40 HV after heat treatment with AA 4043, AA 5356, and AA 2319, and 1441 fillers respectively. Tensile strength showed similar trends as hardness in the as welded and heat treated conditions. The hot cracking tendency was the maximum for welds deposited with 1441 filler and the minimum for welds deposited with AA 5356 filler, both values being less than the cracking tendency for autogenous welds. Hot cracking tendency was correlated with grain size, segregation distance, and distribution of the low melting phases.