Abstract
In this research, the effects of both current and argon gas pressure on the bending properties of welded joints were studied. Using the possible ranges of welding gas pressures and currents, Tungsten inert gas welding (TIG) of stainless steel (304) sheet was used to obtain their influence on the maximum bending force of the (TIG) welded joints. Design of experiment (DOE) ‘version 10' was used to determine the design matrix of experiments depending on the used levels of the input factors. Response surface methodology (RSM) technique was used to obtain an empirical mathematical model for the maximum bending force as a function of welding parameters (Current and Argon gas pressure). Also, the analysis of variance (ANOVA) was used to verify the adequacy of the resulted model statistically.
Highlights
Welding is a critical process in the industry since it used to join different materials, especially stainless steels, which are presently used in various structural engineering parts
It was shown that 50 A current with 1.6 mm welding filler size and low gas flow rate produced finer weld microstructure without crack, and this leads to high tensile strength of joint
Rohit et al [6] used the voltage, current, gas flow rate, and welding speed as the input parameters of 304 stainless steel sheets joined by tungsten with inert argon gas (TIG) welding
Summary
Welding is a critical process in the industry since it used to join different materials, especially stainless steels, which are presently used in various structural engineering parts. It was shown that 50 A current with 1.6 mm welding filler size and low gas flow rate produced finer weld microstructure without crack, and this leads to high tensile strength of joint. Vikarm and Sharma [5] showed that the lower welding speed range of stainless steel 430 joined by TIG welding produced a higher tensile strength as a result to the formation fine dendritic matrix in the weld zone microstructure. Rohit et al [6] used the voltage, current, gas flow rate, and welding speed as the input parameters of 304 stainless steel sheets joined by TIG welding
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