Welding process for butt welding high-strength cylinder body

Abstract

The invention relates to a welding process for butt welding a high-strength cylinder body. The welding process sequentially comprises the following steps of grinding, inspecting, longitudinal seam welding, circumferential seam welding, perforating and inspecting. The welding process is characterized in that both the longitudinal seam welding and the circumferential seam welding adopt a welding mode of combining gas shielded welding and submerged arc automatic welding; the longitudinal seam welding comprises the steps in sequence: preheating for first welding, performing back welding, filling welding for first submerged arc welding, hydrogen removal and back chipping, preheating for second welding, filling welding for second submerged arc welding, post-welding heat treatment, nondestructiveinspection and groove machining; and the circumferential seam welding comprises the following steps in sequence: assembling of the cylinder body, inspecting, supporting by a tool, preheating for welding, back welding, polishing, filling welding through the submerged arc welding, post-welding heat treatment, and nondestructive inspection. The quality or efficiency of a single welding method is improved, the welding operation environment, the working condition and the work intensity are greatly improved, and the welding quality and efficiency are improved by 30% or above.

Description

technical field [0001] The invention relates to the field of butt welding, in particular to a welding process for high-strength cylinder butt welding. Background technique [0002] A large amount of high-strength cylinder material is used in the cylinder-shaped pile leg, and the parts formed by these cylinder materials need to be welded. For high-strength cylinder materials, especially those with large wall thickness and small diameter, the welding difficulty is relatively high, especially the manual welding of the cylinder ring longitudinal seam has a harsh working environment and low work efficiency. Unfavorable factors such as high labor intensity and unstable quality, and multi-layer and multi-pass welding lead to heavy welding workload, low efficiency, labor and time-consuming, harsh production environment, and difficult to guarantee welding quality. [0003] In the prior art, the Chinese patent with the publication number CN105234535A discloses a cylinder welding proc...

AI Technical Summary

Problems solved by technology

For high-strength cylinder materials, especially those with large wall thickness and small diameter, the welding difficulty is relatively high, especially the manual welding of the cylinder ring longitudinal seam has a harsh working environment and low work efficiency. Unfavorable factors such as high labor intensity and unstable quality, and multi-layer and multi-pass welding lead to heavy welding workload, low efficiency, labor and time-consuming, harsh production environment, and difficult to guarantee welding quality

[0003] In the prior art, the Chinese patent with the publication number CN105234535A discloses a cylinder welding process. In this technology, only submerged arc welding is used for bottom welding, filling welding and cover welding inside the cylinder. If only a single welding method is used in the welding process with high strength, large thickness and small diameter, the efficiency and quality will not reach the optimal effect.

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