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The fiber laser welding of dual-phase DP980 steels with high-strength low-alloy LA340 steels was studied with a concentration on microstructure, microhardness, and tensile properties of butt joints. The microstructure in the fusion zone of joints was predominantly built of lower bainite and martensite. Mainly martensite was found in the coarse-grained region of HAZ near DP980 steel, but equiaxed ferrite...
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