Abstract: The melting point of the eutectic and morphological distribution between the grains had great effects on the susceptibility of weld solidification cracks during solidification.The morphological distributions of aluminum 6082 and ZL101 had been obtained by water quenching method and the melting temperature and heat absorption of the weld metal had been measured with DSC.The results show that the type of eutectic and their morphological distribution are different with different aluminum alloy.Al-Mg₂Si and Al-Mg₂Si-Si+Al-AlFeMnSi are two kinds of eutectics for 6082 alloy which are shaped of thin films between the grains and their melting temperatures are 555℃ and 595℃ respectively.For ZL101 alloy there are two kinds of eutectics,namely Al-Si and Al-Mg₂Si-FeMgSi₆Al₈-Si which are distributed with continuous nets between the grains and their melting temperatures are 544℃ and 577℃ respectively.These results are in favor of studying the cracking behaviors of weld solidification cracks.