![]() The role of the elements Ni and Si is to promote the production of martensite and to increase the ferrite strength in welded joints. The welded joints can be divided into the weld zone, the HAZ, and the base metal zone, where the HAZ can be divided into the coarse-grained zone and the softened zone. The results show that the CMT + P welding process can produce lap weldments with good formability and properties. The effects of wire feeding speed (3 m/min~5 m/min) and welding speed (350 mm/min~600 mm/min) on the forming, microstructures, and mechanical properties of DP980 dual-phase steel welded joints were analyzed. The ER120S-G welding wire was used as the filling material to conduct a 70° angle lap welding experiment. In this study, the CMT + P welding technology was used to weld the DP980 dual-phase steel plate with 1.2 mm thickness. The common CMT welding process has certain limitations and is difficult to meet the needs of lightweight manufacturing. The increasing demand for the lightweight production of advanced high-strength steel puts forward higher requirements for the quality of welded joint forming.
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