Application Research on Welding Preheating Technology for In-service Long Distance Pipeline
In-service pipeline welding is a key link in emergency repair technology.The in-service welding technology for X80 high grade steel pipelines in China is not perfect,which is reflected in the lack of strict preheating control during pipeline welding and the risk of hydrogen induced cracks caused by high weld hardness.The paper studies the standards and technical requirements for in-service welding preheating of pipelines at home and board.Based on analyzing the advantages and disadvantages of pipeline welding heating technology,the selection principles of welding preheating technology for high grade steel pipelines are proposed.Introduce the performance parameters and temperature monitoring methods of in-service welding preheating equipment for pipelines in foreign oil companies.The research results have reference value for improving the level of pipeline emergency repair technology in China.
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