Investigation on Post-Weld Heat Treated Titanium-Aluminum Dissimilar Laser Welded Joint

• DOI: 10.1007/s40032-021-00722-7
• Publication Date: 2021-06-17T12:02:31Z
• Authors: Sudhin Chandran; R. Rajesh; M. Dev Anand
• Keywords: Titanium alloy; Butt joint; Butt welding

The influence of post-weld heat treatment on the mechanical properties and microstructure of Ti/Al laser welded joints was studied, which included solution treatment and artificial aging treatment. A concerted heat source is provided by the laser beam, allowing higher, deeper welding and narrower rates of speeds. Laser beam welding of titanium and aluminum alloy is required for aviation and automobile firms because of its better strength and lightweight. The presented work is carried out at two stages: (a) Laser beam welding of 2 mm thickness A6061 and Ti6Al4V butt seams was done by moving a laser source on the top side of the Ti sheet and finding optimum power, speed and offset that provides higher tensile strength and hardness and (b) post-weld heat treatment (550 °C * 15 min quenching + 200 °C * 15 min aging). From the outcomes, it is seen that laser beam centering from the titanium part gives a very much advanced age solidified pattern, and EDS uncovers that the joint is a metallurgical one. The post-weld heat treatment promotes strength for the fabric over 29%, and laser welding is reasonable for distinct alloy joining. All of these experimental results demonstrate the formation of uniform microstructure in the weld region along with a remarkable enhancement in mechanical properties for the weld region which surpasses the parent material.