Friction spot brazing of stainless steel to titanium (grade 1) using aluminum foil

Abstract

This paper demonstrates a simple and effective technique for friction spot brazing of stainless steel (st37) to titanium (grade 1). We use aluminum foil as a filler that is placed between the base metals. We evaluate the joints when using different rotational speeds: 1800, 2000, 2200, 2400, 2600, and 2800 RPM. We characterize the joint using scanning electron microscopy, optical microscopy, energy dispersive X-ray analysis, the microhardness of cross-sections, and fractography. We found that the strongest tensile strength joint (6 kN) comes from friction spot brazing at 2000 RPM. The joint interface of the 2000~RPM sample contains intermetallic compounds such as FeTi, Fe3Al, FeAl2, and Ti3Al, which increases the tensile strength.

Effects of Interlayer on the Microstructure and Mechanical Properties of Resistance Spot Welded Titanium/Steel Joints: A Short Review

“…Resistance spot welding (RSW) technology is a method that uses the resistance heat generated by the current through the base material to heat the base material until the base material melts, forming solder joints after solidification to achieve metallurgical bonding [4][5][6]. A schematic diagram of the device is shown in Figure 1, and the main process parameters are current, energizing time and electrode pressure [7][8][9]. The welding process is divided into three successive stages.…”