Welding,spiral,seam,the,proces technology Welding of spiral seam in the process of the fine microstruc

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The Effect of Welding Material on Weld Microstructure and Properties of Spiral Two-step Welding Pipe Abstract: Aim at the problem of LASO steel weld impact property which occurred in mass production spiral two-step welding pipe using the welding wire with higher contents of Cr Ni Ti and other elements to conduct welding weld sample was taken out through different welding match the microstructure and mechanical properties were analyzed the results indicated that the total quantity of proeutectoid ferrite distributed in both sides of column crystal was reduced after replacing welding wire. The weld microstructure mainly included acicular ferrite the grain of acicular ferrite (AF) proeutectoid fen'ite (PF)was finer its impact toughness value was obviously increased. Key words: spiral two-step welding pipe; welding material component; proeutectoid ferrite (PF); acicular fenite (AF); impact toughnessThese aspects will effect the quality of Submerged arc welding steel pipe. Article Tags: Spiral Two-step Welding, Two-step Welding Pipe, Mechanical Properties, Spiral Two-step, Two-step Welding, Welding Pipe



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