Influence of Pre and Post Heating Conditions in Welding of AA6061 and AA6063 Alloys Using RSM

Abstract

Welding is an operation used for Joining metallic parts by the application of heat. In the Gas Tungsten Arc Welding metals are fused together by heating them by an electric arc established between a non-consumable tungsten electrode and the work piece. The resulting welds have the same chemical integrity as the original base metal. Pre and post heating processes influence the mechanical properties and microstructure of the weldment. In the present work, ultimate tensile strength (UTS), impact strength (IS) and hardness of the weldment will be analyzed in the welding of different Aluminium alloys (AA 6061 and AA6063). The TIG welding will be performed on AA6061, AA6063 materials at normal, Pre and Post heating conditions. Three process parameters were considered in normal welding which are root gap, groove angle, root face. In addition to the normal welding parameters time, temperature was considered for pre and post heating welding. The L9 orthogonal array were used for experimentation. The effect of process parameters on UTS, IS and Hardness were analyzed in three processes. A comparative analysis for all the three welding conditions were investigate.

Keywords:Response surface methodology, Hardness (H),Ultimate Tensile strength (UTS), Impact Strength (IS), Tungsten Inert Gaswelding, Pre-heating, Post heating, WeldingParameters