Evaluation of the joint-interface properties of austenitic-stainless steels (AISI 304) joined by friction welding

The aim of this study is to investigate experimentally the micro-structural properties and welding strengths of the joints using austenitic-stainless steel (AISI 304) parts. The experiments were carried out using a beforehand designed and constructed experimental friction welding set-up, constructed as continuous-drive. Firstly, pilot welding experiments under different friction time and friction pressure were carried out to obtain optimum parameters using statistical approach. Later, the strengths of the joints were determined by tension, fatigue and notch-impact tests, and results were compared with strengths of materials. Hardness variations and microstructures in the interfaces of the joints were also obtained and examined. Then, obtained results were compared with those of previous studies.