Construction method for penetration weld of T-shaped joint

The invention discloses a T-shaped joint penetration weld construction method, which relates to the technical field of welding, and comprises the following steps: arranging a supporting plate on one side of a full penetration groove of a welding joint, tightly attaching one end of the supporting plate to a base material, and fixing by adopting positioned welding; welding flux is filled from the other side of the groove, and the filling height of the welding flux is aligned with the root of the groove; groove side welding is conducted, low-current swing welding is adopted for a backing weld, and it is ensured that the backing weld is fused with the side wall of the groove; and after at least two grooves are welded on the front surface, removing the supporting plate of the back welding flux, cleaning the welding flux, and after the back of the welding seam is formed, symmetrically and alternately welding two surfaces of the welding seam. According to the invention, the welding joint is optimized, the supporting