Document Type : full paper
Authors
1
Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr/Isfahan, Iran
2
MSc Student, Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr/Isfahan, Iran
3
Assistant Professor, Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr/Isfahan, Iran
Abstract
The Inconel 625 super alloy is widely used in the power plant, aerospace and mining industries due to its good mechanical properties, weldability and high corrosion resistance. One of the most common methods of welding this alloy is the resistance spot welding. Evaluation of spot-welding in order to ensure the quality and strength of the machine parts is very necessary. In this paper, for the first time some parameters such as current, welding time, pressure and pulse are experimentally studied to determine the tensile strength and hardness for the sheets of Inconel 625 alloy. Also design of experiments by Taguchi method has been used to study the interaction of these parameters. Based on the analysis of S/N, the effect of these parameters on the tensile strength and hardness are provided and the optimum conditions of process are presented to achieve the highest quality of welding. Also based on the test data, the ANOVA analysis with high precision is done to determine the main factors and interactions between them. The experimental results showed that the main factors with greatest effect on the tensile strength are respectively the current (%42), time (%26.3), pressure (%20.4) and number of pulse (%11.3). Also, the current (%32.3), time (%31), pressure (%23.7) and number of pulse (%13), respectively, have the highest impact on the surface hardness.
Keywords
)