On-line surfacing repair method for weld repair of carbon steel branch pipe

Abstract

The invention provides an online surfacing welding repair method for carbon steel branch pipe weld repair, which designs the surfacing welding structure according to the collected original data of the carbon steel branch pipe welding seam to ensure that the surfacing welding structure meets the structural strength and structural integrity According to the minimum effective wall thickness requirements, and according to the designed surfacing structure, the carbon steel branch pipe welds are repaired by surfacing welding. During welding, the carbon steel is realized by controlling the welding process (including heat input, welding bead lap) and surfacing welding structure. The tempering effect of steel structure repair has realized the quality assurance under the condition of exempting welding heat treatment after welding when the weld seam of carbon steel branch pipe is repaired on site. Compared with the prior art, the present invention does not need to shut down the system or isolate the pipeline when the welding seam of the carbon steel branch pipe is repaired online, and can avoid post-weld heat treatment. Through structural reinforcement and stress improvement, the carbon steel branch pipe can be guaranteed Welds meet the requirements for life-cycle operation.

Description

technical field [0001] The invention belongs to the field of welding repair, and more specifically relates to an online surfacing repair method for repairing weld seams of carbon steel branch pipes. Background technique [0002] In the piping design, the branch pipe weld is a common connection method between the main pipe and the branch pipe. Among them, the carbon steel branch pipe weld structure is widely used in pressure-bearing equipment and pipelines in electric power, petroleum, chemical and other industries. In engineering projects, due to manufacturing or operation and other reasons, various defects will occur inside or on the surface of the branch pipe welds, which need to be repaired. If traditional repair methods such as digging and replacement of pipe fittings are used, temporary outage and partial isolation of related pipeline systems are often required, which affects system functions and is not feasible in some occasions. Therefore, it is hoped to adopt online ...

AI Technical Summary

Problems solved by technology

However, there is no mature case of on-line surfacing repair of carbon steel branch pipe welds without emptying the internal medium environment. The difference in material properties and working conditions makes it impossible to use carbon steel branch pipe welds with stainless steel pipe welds or dissimilar metals. In-line surfacing welding repair in the same way as the welding seam at the safe end of the pipe

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