Influence of thermal characteristics on microstructure of pulse current GMA weld bead of HSLA steel
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The influence of pulse parameters of pulse current gas metal arc welding (P-GMAW) on thermal behavior of weld has been studied considering summarized influence of pulse parameters defined by a dimensionless factor ϕ = [(I b/I p)f. t b], mean current (I m), and heat input (Ω) during weld bead deposition on high-strength low-alloy steel plate using low-alloy steel filler wire. The thermal behavior of the weld has been estimated with the help of appropriate expressions. The validity of those estimations has been confirmed by comparing them with measured values and found that they are well in agreement to each other with a deviation lying in the range of 7 to 8 %. It is observed that variation in thermal characteristics of weld is maintaining good correlation with ϕ, I m, and Ω of the welding process. The thermal characteristics of the weld are correlated to microstructure.
KeywordsP-GMAW Pulse parameters Weld pool HSLA steel Weld isotherm, thermal cycle
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