Welded H beam is named after the welding process used to make the cross section into an H shape. It is divided into submerged arc welding H-beam and high frequency welding H-beam. The process of submerged arc welding H-beam is: steel plate--automatic striping--assembly--automatic submerged arc welding--defect detection--flange correction--web correction--end surface processing--sandblasting and rust removal--painting. The fully automatic submerged arc welding production line is controlled by a microcomputer from unloading, assembly, and welding to ensure the dimensional accuracy of the H-beam produced, and the quality of the welds meets national standards.