Dissimilar steel joints have been more and more widely used in industries in recent years. When a dissimilar steel joint with medium or thick plate is performed, a groove is usually prepared for obtaining a sound joint with full penetration. Because weld metal needs to be deposited within the groove to form the joint, it is expected that different groove shape will require different heat input and weld passes. Theoretically, different heat input and weld pass possibly have a large influence on welding resid...