Study and analyses of arc length correction and mechanical properties on weld bead geometry for AA6061T6 by CMT process

Abstract

Cold Metal Transfer (abbreviated CMT) is a welding method that usually performed by a welding robot. The CMT machine detects a short circuit that sends a signal that retracts the welding filler material, giving the weld time to cool before each drop placed. This leaves a smooth weld that is stronger than that of a hotter weld. In this paper, the effect of arc length correction on the weld bead geometry of AA6061T6 material ERER4043 (AlSi5%) used as filler wire, And various parameters was investigated by this method. The thickness of used material was 3.18 mm. And, applying the current, (80 A, 90 A, and 100 A). The welding speed was used (6, 9, and 12 mm sec−1) on above work with Arc Length Correction (0, −5, −10), used as an input parameter. The investigation observed while shielding gas flow rate 15-litter min − 1 and contact tip work piece distance (CTWD), 10 mm both were maintained constant. The results have been showing in this papered with weld beads processed by robotics. The microstructural characterization carried out using optical microscopy. CMT has high dilution and penetration with minor heat input. In this process, we found reduced residual stresses.