Spiral seam submerged arc welded pipe manufacturing process

Abstract

The invention provides a manufacturing process of a spiral seam submerged arc welded pipe. The purpose of the present invention is achieved in this way: 1) raw material inspection, 2) stock preparation, 3) uncoiling, 4) leveling, 5) steel strip alignment, 6) disc shearing, 7) edge milling, 8) steel strip Delivery, 9) Steel strip edge pre-bending, 10) Forming, 11) Forming inspection, 12, 13) Internal and external automatic welding, 14, 15) Initial inspection, internal inspection, 16) Steel pipe cutting, 17) Manual repair welding, 18) X-ray inspection, 19) water pressure, 20) water pressure test inspection, 21) ultrasonic inspection, 22) magnetic particle inspection, 23) chamfering, 24) physical and chemical inspection of products, 25) finished product inspection, 26) spray marking. Submerged arc automatic welding can use large welding current, the arc heat is concentrated, the penetration depth is large, and the welding wire can be fed continuously, so its production efficiency is 5-10 times higher than that of manual arc welding; it saves materials and electric energy, and is environmentally friendly and harmless to the human body.

Description

technical field [0001] The invention provides a manufacturing process of a spiral seam submerged arc welded pipe. Background technique [0002] At present, due to the lack of concentrated heat, the direct welding of spiral seam steel pipes causes the welding metal to splash around, resulting in great loss, a lot of discarded electrode heads, and the beveling of workpieces with small thicknesses, thus wasting a lot of metal materials and electric energy; manual operation, welding Arc light can be seen in the factory, and there is a lot of welding fume, so the working conditions are very harsh, which is very harmful to the human body. Contents of the invention [0003] The purpose of the present invention is to provide a brand-new process for the manufacture of spiral seam submerged arc welded pipes. [0004] The purpose of the present invention is achieved like this: 1) Raw material inspection: according to relevant national standard to steel strip, the outward appearance ...

AI Technical Summary

Problems solved by technology

[0002] At present, due to the lack of concentrated heat, the direct welding of spiral seam steel pipes causes the welding metal to splash around, resulting in great loss, a lot of discarded electrode heads, and the beveling of workpieces with small thickness...