The aim of the work is to analyze the laser welding quality of USIBOR®1500-AS, without the coating removing. Through metallographic analysis, the martensitic phase was found both in the Fused Zone and in the Heat Affected Zone. Within the Fused Zone was, also, found a certain amount of Al-Si coating, which essentially depended on the welding speed. That coating modified the molten pool solidification mechanism, but did not affect the welds characteristics, in terms of defects and hardness. The welding speed did not affect the hardness values, while strongly influenced the Fused Zone and Heat Affected Zone widths.
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