Abstract

The current work's objectives were to examine the effects of different process variables, including welding current (I), the flow rate of gas (l/min), and voltage (V), on change in the ultimate tensile strength, hardness, and chemical composition of the weld bead geometry of SS304 Steel, and to optimize the procedure so that, after a Gas Tungsten Arc Welding GTAW, there are fewer changes as possible in material properties of the weld joint. By analysing the tensile strength of the welded specimens, it was discovered that the voltage is the most significant factor, current and flow rate of gas were the important elements influencing tensile strength. As the welding current rises, the tensile strength tends to increase significantly; however, when a welding current of 60 Ampere, voltage of 40 V, and flow rate of gas of 18 l/min were utilized, the tensile strength was found to be more significant. The hardness of the welded specimens was studied, and it was observed that current, voltage, and flow rate of gas were the substantial factors leading to changes in the hardness. The weld joint hardness decreased significantly with the increase in welding current; higher hardness of the joint was observed at the current of 60 Ampere, voltage of 30 V, and flow rate of gas of 16 l/min. was used. Chemical testing of the weld joint is examined by Spark Atomic Emission Spectrometry Standard Research System as per test ASTM E 1086 and found that the chemical composition of the weld joint was constant along with all the samples at all process parameters. According to the findings of this study, welding current most significantly affects the ultimate tensile strength and hardness of the weld joint.

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