Method for improving welding efficiency of welding seam of 9% nickel steel transverse butt jointed board

The invention discloses a method for improving the welding efficiency of a welding seam of a 9% nickel steel transverse butt jointed board, which comprises the following steps of: (1) forming an X-shaped groove in the 9% nickel steel jointed board, and finishing assembling according to the assembling size requirement of the X-shaped groove; (2) the truncated edge of the groove surface of the 9% nickel steel jointed plate is polished, and impurities on the two sides of welding seams on the front face and the back face of the groove of the 9% nickel steel jointed plate are removed; (3) reinforcing and fixing the reverse side of the welding seam of the 9% nickel steel jointed board by adopting a clamping plate, and additionally arranging an arc striking and extinguishing plate at the arc striking and extinguishing end of the welding seam of the 9% nickel steel jointed board; (4) when the front face of the X-shaped groove of the 9% nickel steel jointed board is welded, backing welding is carried out firstly, then