Effects of Process Parameters on the Weld Quality During Double-Pulsed Gas Metal Arc Welding of 2205 Duplex Stainless Steel
In this paper, double-pulsed melting inert-gas welding (MIG) was conducted on 2205 duplex stainless steel and the effects of the number of strong pulses, the number of weak pulses and the welding speed were studied. The electrical parameters in the welding process were collected through the wavelet analyzer. The waveform charts of the current and voltage, the U-I diagram, the energy input, the dynamic resistance and other real-time signals were analyzed. In addition, mechanical tensile and metallographic tests were conducted. The results demonstrated that the welding speed had the highest impact on the welding quality among all the three factors, followed by the number of weak pulses and the number of strong pulses. The welded seam obtained by various numbers of strong and weak pulses was relatively uniform, indicating that the effect of the number of strong and weak pulses on the welded seam was relatively low. The tensile fracture occurred in the base material part of the duplex stainless steel, indicating that the welded seam region had a higher tensile strength than the base material. The tensile strengths of various specimens were similar. When the welding speed was reduced, the heat input increased during the welding of the welded seam, the cooling rate of the welded seam slowed down, whereas the ferrite transition duration increased, which led to the formation of higher amount of austenite and a relatively coarse structure.
KeywordsDuplex stainless steel Double pulse MIG Welding quality
The research was sponsored by the High-level Leading Talent Introduction Program of GDAS (2016GDASRC-0106), the Natural Science Foundation of Guangdong (2016A030313117), the Industry-university-research of Guangdong province and Ministry of Education (2013B090600098).
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