Welding production method for spiral seam submerged-arc welding steel pipes

Abstract

The invention discloses a welding production method for spiral seam submerged-arc welding steel pipes. In the traditional one-step spiral seam submerged-arc welding production device, welding is performed on the steel pipes when a welding position of an inner welding bead is pushed back by at least one screw pitch from a welding position of a traditional inner welding bead or welding is performed on the steel pipes when the welding positions of the traditional inner welding bead and a traditional outer welding bead are pushed back by at least one screw pitch. According to the welding production method for the spiral seam submerged-arc welding steel pipes, inner welding bead welding and steel pipe forming which are separated are performed in a relatively independent mode; mutual interference between the forming and welding is small; degree of freedom of welding position arrangement is large, namely, uphill welding, downward welding or downhill welding can be performed; final quality of welding can be guaranteed due to selection of most appropriate welding parameter assemblies.

Description

technical field [0001] The invention relates to the technical field of mechanical manufacturing, in particular to a welding production method of a spiral seam submerged arc welded steel pipe. Background technique [0002] In the prior art, in the production of traditional spiral seam submerged arc welded steel pipes, the inner bead is welded at the formed seam while the coil is being formed, and the outer bead is welded after a half-pitch interval. Because the inner bead welding is carried out at the same time after the steel pipe is formed, the quality of the inner bead is not easy to guarantee. At the same time, the forming seam in the steel pipe production is often at the 6'clock position (the bottom), so that the inner welding is often arranged on the uphill welding The position, the flow of the inner weld pool causes the unsatisfactory inner weld shape to affect the subsequent coating of the steel pipe. Contents of the invention [0003] The purpose of the present in...

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Problems solved by technology

Because the inner bead welding is carried out at the same time after the steel pipe is formed, the quality of the inner bead is not easy to guarantee. At the same time, the forming seam in the steel pipe production is often at the 6'clock position (the bottom), so that the inner welding is often arranged on the uphill welding position, the flow of the inner weld pool causes the unsatisfactory inner weld shape to affect the subsequent coating of the steel pipe

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