A kind of anti-icing riser welding method

Abstract

The invention provides a welding method for ice-resistant water riser, which changes the original V-shaped groove into a symmetrical X-shaped groove; the longitudinal seam and the circular seam welded with the joint are welded by internal and external submerged arc welding; the joint and the pipe body weld the ring The inner seam is first welded by the submerged arc welding manipulator, and the outer groove is filled after the outer root is cleaned and polished; it has the advantages of high speed and high efficiency.

Description

technical field [0001] The invention relates to a pipeline welding process. Background technique [0002] Anti-ice risers are widely used in offshore oil and gas development and drilling projects in offshore flats and deep sea operations. They can effectively resist damage to wellheads caused by harsh natural conditions such as wind, waves, currents, and ice, and greatly improve drilling efficiency. [0003] The thickness range of the anti-ice riser pipe body is generally 26~45mm, and the welding method suitable for production is high-efficiency submerged arc automatic welding. In the past, the welding process of root cleaning submerged arc welding on the back of the V-shaped groove of the longitudinal seam, and arc welding of the V-shaped groove electrode on the circular seam is used. Although this process is convenient to assemble and assemble, there are defects such as large welding workload, waste of welding materials, relatively low weld metal fusion ratio, large weld ...

AI Technical Summary

Problems solved by technology

Although this process is convenient for assembly and assembly, there are defects such as large welding workload, waste of welding materials, relatively low weld metal fusion ratio, large weld residual stress, large influence of human factors in electrode arc welding, and low efficiency.

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