College of Power&Mechanical Engineering ,Wuhan University ,Wuhan ,430072;
College of Power&Mechanical Engineering ,Wuhan University ,Wuhan ,430072;
Wuhan Steel Group Company Technique Center , Wuhan,430080;
College of Power&Mechanical Engineering ,Wuhan University ,Wuhan ,430072;
Harbin Welding Institute, Harbin,150080;
Harbin Welding Institute, Harbin,150080;
heat input; heat-affected zone; ultra-fine grain steel; ultra narrow-gap welding;