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Variation of chemical composition of high strength low alloy steels with different groove sizes in multi-pass conventional and pulsed current gas metal arc weld depositions

查看全文 作　　者：[1]K.DEVAKUMARAN;[2]M.R.ANANTHAPADMANABAN;[3]P.K.GHOSH 高影响力作者 机构地区：[1]Welding Research Institute,Bharat Heavy Electrical Limited;[2]Department of Mechanical Engineering,M.A.M College of Engineering and Technology,Siruganur;[3]Department of Metallurgical & Materials Engineering,Indian Institute of Technology Roorkee高影响力机构 出　　处：《Defence Technology(防务技术)》索引2015年第11卷第2期,共10页高影响力期刊 基　　金：the Indian Institute of Technology Roorkee (IITR), India for supporting to the research work 摘　　要：25 mm thick micro-alloyed HSLA steel plate is welded by multi-pass GMAW and P-GMAW processes using conventional V-groove and suitably designed narrow gap with 20 mm(NG-20) and 13 mm(NG-13) groove openings.The variation of weld metal chemistry in the multi pass GMA and P-GMA weld depositions are studied by spark emission spectroscopy.It is observed that the narrow groove GMA weld joint shows significant variation of weld metal chemistry compared to the conventional V-groove GMA weld joint since the dilution of base metal extends from the deposit adjacent to groove wall to weld center through dissolution by fusion and solid state diffusion.Further,it is noticed that a high rate of metal deposition along with high velocity of droplet transfer in P-GMAW process enhances the dilution of weld deposit and accordingly varies the chemical composition in multi-pass P-GMA weld deposit.Lower angle of attack to the groove wall surface along with low heat input in NG-13 weld groove minimizes the effect of dissolution by fusion and solid state diffusion from the deposit adjacent to groove wall to weld center.This results in more uniform properties of NG-13 P-GMA weld in comparison to those of NG-20 and CG welds. 关 键 词：熔化极气体保护焊 高强度低合金钢 化学成分变化 金属沉积 脉冲电流 传统 焊接金属 GMAW
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