Monitoring the FSW Processes with Use of Thermal Imaging
Friction stir welding (FSW) is a recently developed method for making a rigid joint of materials that are otherwise hard to weld. It uses a rotating tool for softening the materials without reaching the melting point, and while the tool is moved along the joint line the plasticised material from the joined materials is mixed and hardened producing the solid phase bond. The article presents the authors’ method for monitoring the Friction Stir Welding (FSW) processes with use of thermal imaging camera.FSW method is a new method and there are only few tools to assess the quality of the process, especially on-line, that is in the making of the weld. The authors propose a method for monitoring the FSW process using hybrid vision methods that is acquisition of the image of the weld with the use of a thermal imaging camera and visual band camera. The paper presents selected results of research performed using infrared imaging channel.The recorded thermograms allow identifying the weld defects and non-compliances during the process and using a thermal imaging camera, also allow detecting subsurface defects. The obtained results indicate its potential practical application but still the described application is to be further developed to become a part of a hybrid system for monitoring the FSW processes.
Algirdas V. Valiulis, Olegas Černašėjus and Vadim Mokšin
J. Mężyk and S. Kowieski, "Monitoring the FSW Processes with Use of Thermal Imaging", Solid State Phenomena, Vols. 220-221, pp. 859-863, 2015