Dissimilar Dual Phase-Low Carbon Steel Joints by the GMAW Process Subjected to Impact Load

César M. Gómora, Ricardo R. Ambriz, Christian J. García, Ismael Ruíz-López, David Jaramillo

Research output: Contribution to journalArticlepeer-review


Dissimilar welding used in the automotive area are possible joints with the GMAW process; however, its structural performance must be evaluated. The focus of this work is to study the microstructural–mechanical properties of dissimilar welding DPC340Y590T dual phase–JSC270C low carbon steels. Microhardness profile, tensile, and impact tests were used to evaluate the mechanical behavior, while optical and scanning electron microscopy were employed to evaluate the microstructural changes. The tensile strength was 540 and 275 MPa in dual phase and low carbon, respectively. Weld thermal cycles were obtained by means of K type thermocouples. The welding heat input generated martensite and grain growth in the dual phase heat affect zone, while grain growth and perlite phase increased in the low carbon heat affected zone. The variation in microhardness profile was produced by the presence of different phases, and the temperature at the end of dual phase heat affect zone was approximately 242 C. During impact tests, the absorbed energies were 19.3, 50.7, and 50.2 J for low carbon, dual phase steel, and the welded dissimilar joint respectively. Finally, dissimilar welding subjected to tensile test failed in the low carbon steel (270 MPa), out of the heat affect zone, thus a good dissimilar joint between both steels was obtained.

Original languageEnglish
Article number404
Issue number3
StatePublished - Mar 2022


  • Dissimilar welding
  • Dual phase steels
  • GMAW process
  • Impact test
  • Low carbon steels


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