自动焊在役焊接熔池结构参数预测及试验研究  

Prediction and experimental study of welding pool structure parameters of automatic in-service welding

作　　者：温晓峰 WEN Xiaofeng(State Oil and Gas Pipeline Network Group Co.,Ltd.,Northern Pipeline Company,Langfang 065000,China)

机构地区：[1]国家管网集团北方管道有限责任公司,河北廊坊065000

出　　处：《压力容器》2021年第10期28-34,共7页Pressure Vessel Technology

摘　　要：近年来,我国新建的天然气干线均采用高钢级、大口径管道,钢级、管径大幅提高,导致修复管件安装时焊接充填量剧增,若仍采用传统手工焊,由修复周期大幅增长所导致的经济损失和社会影响不可估量。如何结合自动焊工艺快速确定施焊内压,使之最大限度供气的同时,实现缺陷管段的高质量快速修复,成为亟需解决的问题。选取中俄东线南段管道工程1219 mm×18.4 mm,1219 mm×22 mm,1219 mm×27.5 mm的X80级管道,采用非线性瞬态有限元方法,综合考虑管材和天然气热物理性能参数,建立自动焊在役焊接热场分析模型,确定了焊接熔池结构参数,验证性试验结果显示其具有一定保守性。在此基础上,考虑不同地区设计系数,采用等效缺陷法确定了自动焊工艺条件下的容许施焊内压,分析结果可为工程施工提供参考。In recent years,China′s new natural gas main pipelines all use high-grade and large diameter pipes,and steel grade and pipe diameter are significantly improved,resulting in the dramatic increase of welding fill when installing the repaired pipe fittings.If traditional hand welding is still used,economic losses and social impacts will be immeasurable due to the longer maintenance time.How to combine the parameters of automatic welding process,and quickly determine the internal pressure of welding,so that the pipeline can meet the gas supply to the maximum extent while achieving high-quality fast repair,has become an urgent problem to be solved.The X801219 mm×18.4 mm,1219 mm×22 mm,1219 mm×27.5 mm pipes used in the pipeline project in the southern section of the China-Russia Eastern Line were selected.Under the premise of considering the thermal physical performance parameters of pipeline steel and natural gas,a model of automatic in-service welding model was established using nonlinear transient finite method,so as to determine the structure parameters of welding pool,and the verification test results show that it is conservative.On the basis of the above,considering the design coefficients of different regions,the equivalent defect method was used to determine the permissible welding internal pressure under the conditions of automatic welding process.The study results above can provide technical reference for engineering construction.

关 键 词：自动焊 在役焊接 等效缺陷法 数值模拟 

分 类 号：TH49[机械工程—机械制造及自动化] TG44[金属学及工艺—焊接]