Optimization of Welding Process Parameters in Novel Friction Stir Welding of Polyamide 66 Joints

Abstract

The friction stir welding of polyamide 66 with a specially modified tool is studied. A variation of the conventional friction stir welding is investigated by incorporating a friction plate for the purpose of heating the polymer in the course of welding process through the tool shoulder. This in turn, improves the efficiency of the weld. The association of the welding process parameters and the weld performance has been investigated by the grey relational analysis with multi response characteristics like weld tensile strength, percent elongation and hardness. Macrostructure of the weld joint cross section has been explored by Stereo microscope. The maximum weld tensile strength of 63 MPa and a Shore hardness of 60 D at the weld nugget are obtained. The hardness profiles of the welded samples have been analyzed in this investigation.

Assessment of dissimilar joining between metal and polymer hybrid structure with different joining processes

“…a) molten material formation b) bonding formation c) molten material cooling with time. 30 Laser welding uses a concentrated heat source on the base metal to produce narrow and deep welds. 31,32 No filler material is required, for stable welding it should be automated.…”

Open-Closed-Loop Iterative Learning Control With a Self-Adjustive Factor of the Gas Tungsten Arc Welding (GTAW) Process

“…Manual gas tungsten arc welding (GTAW) process [1][2][3][4], which is a reliable efficient and practical metal filling process, is commonly used in industry especially in the applications requiring high weld quality (such as aerospace, automobile, transportation and petroleum, etc.). During this process human welders can appraise the state of weld joint penetration through their observation on the weld pool and intelligently adjust the welding parameters [5][6][7] accordingly to control the welding process in a bid to achieve the desired penetration state. Because of their sensory capabilities and experience-based behavior, they are sometimes more preferred than automated welding machines.…”