Arc pilot plates are used for welding seams. At the starting point and end point of the welding point, the butt weld is often cut due to the weldment of the butt weld, so the types of the butt weld of the weldment include straight edge seam, unilateral V-shaped seam, bilateral V-shaped seam, U-shaped seam, K-shaped seam seam, X-shaped seam, etc.
