Abstract
To improve the phase balance in the weld metal of keyhole gas tungsten arc welding (K-GTAW) joint, the Ni element was added in a form of pasting a certain width and thickness (depending on the added content) of nickel band on the I-type groove. The results show that three different convection zones along thickness direction, which are the Marangoni convection, a convection driven by Lorentz force, as well as a transition layer. And then the chemical composition (Ni element content) and solidification mode transform along thickness direction. Therefore, the lathy, acicular and Widmanstätten austenite, in turn, appear along thickness direction. Meanwhile, the intensity of Kurjdumov-Sachs (K-S) orientation relationships ORs dominants gradually.
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