The effect of welding stainless steels with lazer spot welding method on microstructure and mechanical properties

Stainless steel is an important class of engineering materials, which are widely used in various industries and environments. The demand of our developing country industry for stainless steels is increasing day by day. Most of the stainless steels classified as metallurgical phases predominantly in the form of austenitic stainless steels, martensitic stainless steels, ferritic stainless steels, precipitation hardenable stainless steels, and double phase (duplex) stainless steels. Have a high weldability and are resistant to arc welding, laser welding can be welded with laser beam welding. Welding is a method of production which is used extensively in metalworking industries, and is based on the combination of two materials to be combined with any external energy source and if it is heated with high energy of the filler material to be added from outside, it melts and bonds to each other. In this study, the characterization of the weld zone of stainless steels combined with laser spot welding, one of the welding methods of stainless steels, will be examined. One of the external energy sources used for welding is a laser beam. The biggest difference of laser beam from other energy sources is that it can be easily directed to the desired point on the part. In this way, the desired amount of energy may be applied topically to the area to be welded. It has been shown that 1 mm thick AISI 304, AISI 316 and AISI 321 quality austenitic and AISI 430 ferritic stainless steel sheets can be joined by laser spot welding method.