Assessment of the Combined Effects of Input Parameters on Solidus and Liquidus Temperature in TIG Welding

Solidus and Liquidus temperatures are important parameters in processes such as welding and heat treatment as the temperature ranges at which the liquid weld metal begins to solidify and the base metal or filler material achieves its melting point by changes from a solid to a liquid state are crucial metrics in welding. The quest for optimality and stability of the process is a major concern to the professionals in the industry. The application of the surface plot in the investigation of the combined effect of input parameters on liquidus and solidus temperature was pursued in this study using Response Surface Methodology. The central composite design matrix was used to obtain data from sets of experiments. Expert software was used to design the experimental matrix and then a set of experiments was performed according to the matrix generated and surface plots were used to carry out a behavioral comparison. With the data collected from twenty experimental runs in this study, the result of the surface plot shows that a desired value of Liquidus and solidus temperature depends on current, voltage, speed, and the liquidus and solidus temperature decreases proportionately as the input parameters increase.