Optimization of Hybrid Ultrasonic Frequency Pulsed VP-GTAW Process Parameters on Tensile Properties of AA 5456 Alloy

Abstract

Abstract:Tensile properties optimization of AA 5456 aluminum alloy was carried out with hybrid ultrasonic frequency pulsed variable polarity gas tungsten arc wending (HPVP-GTAW). An orthogonal method was employed to conduct the experiments, and the tensile properties of AA 5456 aluminum alloy welded joints were measured and analyzed. Regression models were developed based on the least square estimation by taking tensile strength, yield strength, percent elongation, and ratio of reduction in area as response functions of variable polarity frequency f L , pulse frequency f H and a dimensionless parameter ψ, which were calculated by background current I b , peak current I p , and pulse duration δ, respectively. The developed regression equations were checked for validity by coefficient of correlation r 2 and confirmatory experiments. Optimum parameters of HPVP-GTAW were achieved through the discussion on response surfaces and contour plots drawn using the regression equations.

Research on the Formation, Microstructure, and Properties of 304 Stainless Steel AC-DC Hybrid TIG Welding

“…It is usually compounded by changing the current output mode and adding energy fields [15][16][17]. Cong Baoqiang et al [18,19] added the ultrasound square wave current to the TIG power supply and developed a new TIG welding method, namely, ultra-fast transformation of composite pulse with variable polarity TIG welding. In addition, in recent years, in order to improve the quality of stainless-steel welded joints, many stainless-steel welding technologies have been studied, such as resistance upset welding (UW) [20], laser-arc hybrid welding [21], and tungsten inert gas arc welding (TIG) [22].…”