Research on the welding process of 590MPa grade high strength automobile beam steel

摘要

590 MPa automobile beam steel strips are used mainly to manufacture the longitudinal beam of trucks. It’s welding properties are critical to the safety of truck. The microstructure and mechanical properties of welding joints processed by co2 arc welding with different welding parameters were studied. The results showed that the welding joints were weak when welding heat input were small and the non metal inclusions were found in the weld joints when welding heat input are big. The quality of the welding joints is good enough at 170A of the arc current and 24V of the arc voltage. Keeping the other welding parameters fixed, the incomplete fusion defect occurred in the welding joint with backward welding, but the quality of the welding joint is good with forward welding.