E81T8-Ni2 was used to replace E71T8-Ni1 on filling and cap welding of welding wire for L415M pipeline steel girth welding joint in welding procedure.The replacement principle does not conform to the covering principle of GB/T 31032-2014"Welding and acceptance standard for steel pipings and pipelines",welding procedure qualification must be carried out again.Based on the welding procedure requirements of the construction unit,in order to verify whether E81T8-Ni2 can be used for filling and cap welding of L415M butt weld,the combined welding method of electrode arc welding and self-protection flux cored wire semi-automatic filling and cap welding was adopted.The welding material of root bead was E6010,filling and cap welding was E81T8-Ni2,welding procedure was qualified according to GB/T 31032-2014.Appearance inspection,non-destructive testing,tensile test,bending test,notching hammer test and impact test were carried out on the assessed specimens.The test results show that the circular welded joints of L415M pipeline steel were qualified,the tensile sample was broken on the base material,and the welded joints meet the requirements of high strength matching.The results of welding procedure qualification test can provide reference for the selection of welding procedure and welding material of L415M pipeline steel for long-distance pipeline.
关键词
长输管道/L415M/FCAW/E81T8-Ni2/焊接工艺评定
Key words
long distance pipeline/L415M/FCAW/E81T8-Ni2/welding procedure qualification
维普
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