Abstract: Investigates the weldability of hot-rolled martensitic dual-phase steel MH600DP and bainitic dual-phase steel MH540FB for automotive wheel spokes and rims through calculations of carbon equivalent, cold cracking sensitivity coefficient, hardness, and metallographic analysis. The research includes the study of MAG welded butt joint weld seam structure and microhardness distribution. The research findings have certain practical significance and application value.