Process for welding bent box type

The invention provides a process for welding a bent box type. The process for welding the bent box type comprises the following steps: S1, groove preparation: forming grooves in a box body wall plate and a part plate; S2, part plate assembling: placing a flange plate on an assembling jig frame, then assembling webs on two sides of the flange plate, finally, assembling an inner partition plate in the middle of the flange plate, to complete the part plate assembling action; S3, assembling an electroslag welding holding strip; S4, performing welding for the first time; S5, performing welding for the second time; S6, assembling a cover plate; S7, forming electroslag welding holes; S8, performing welding for the third time; and S9, performing ultrasonic acceptance inspection for a weld joint. According to the process, stable assembly of the bending box type is achieved through assembly of all the structures, then all the structures are stably welded together through electroslag welding operation, and accurate and