1) strip that is, the volume of raw materials, wire, flux. In the pre-investment must go through rigorous physical and chemical testing.

(2) strip head and tail docking, a single-or double-wire submerged arc welding wire, steel pipe rolled in after the use of automatic submerged arc welding repair welding.

(3) forming, after a strip-Jiao, cutting edge, the edge plane, the surface of clean-up and delivery to deal with curved edge.



(4) use of electric contact manometer pressure on both sides of the conveyor control of the fuel tank pressure to ensure a smooth transfer strip.

(5) use of outside control or roll-forming control.

(6) weld gap control device used to ensure the welding seam gap to meet the requirements of the diameter, and weld the wrong side of space are strictly controlled.

(7) inside and outside the welded welded U.S. Lincoln welding machines used for single-or double-wire submerged arc welding wire in order to obtain a stable welding norms.