Abstract
A method for improving the brazing joining strength of Titanium alloy/Stainless steel fabricated through fibre laser surface texturing is introduced because it is a simple process that does not require the fabrication of complicated interlayers. However, previous research shows that a milimeter scale was fabricated by surface modification for dissimilar brazing join, yielding insignificant results and limiting the application and degree of enhancement. Fiber laser ablation was used in this study to create microscale periodic patterns (grooves) on a stainless steel surface. No defect or damage induced during laser surface texturing process. The groove dimension was tunable by controlling the laser parameters. Vacuum brazing of Ti6Al4V to 316L stainless steel with surface texturing, the average joint strength was 22.1 MPa, 34% of increase of joining strength compared to unprocessed flat surface. The combination of laser surface texturing and brazing proven effectively on joining strength enhancement.
Highlights
Corrosion resistance, high temperature resistance and weight reduction, dissimilar join of titanium alloy/stainless steel components attracted thriving interest in particular industries, such as aerospace repulsion system, oil pipeline and in energy industries focusing for nuclear reactor [1,2]
The results showed that laser surface patterning increased joint strength significantly when compared to an unprocessed flat surface
The results clearly demonstrated that joint strength was highly related to the surface condition, in this case laser power
Summary
Corrosion resistance, high temperature resistance and weight reduction, dissimilar join of titanium alloy/stainless steel components attracted thriving interest in particular industries, such as aerospace repulsion system, oil pipeline and in energy industries focusing for nuclear reactor [1,2]. Active brazing is a more practical method of joining dissimilar materials in which reactive elements such as Ti, Zr, Hf, and Rf are incorporated into brazing alloys to change the chemistry of the surfaces and improve wettability and adhesion of the brazing alloy [9,10]. Previous researchers [14,16,17] share their approach on how to reduce the residual stress in dissimilar brazing joint
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