Brazability of Inconel600 alloy by a Diode Laser with Heat-Resisting Precious Filler Metals

- Study on Laser Brazing using High Power Diode Laser Beam (Report 1) -

Abstract

The laser brazing of Inconel600 alloy with precious filler metals has been conducted using a diode laser generator with single beam and tandem beams for preheating and brazing. Inconel 600 alloy of 1mm thickness was butt-brazed using Au-18%Ni, Ag-10%Pd and Ag-21%Cu-25%Pd filler metals with diameter of 0.5mm by using brazing flux. We make butt-joint with single beam brazing for various brazing clearance and use tandem beam brazing to improve the wettability of melted filler metal. Experimental results have shown that the sound butt joints which are free from defect such as porosity and lack of penetration could be obtained with brazing clearance of 0.1-1.5mm. The joint strengths of brazed joint which were produced in the optimal condition by using Au-Ni and Ag-Cu-Pd filler metals were comparable to the base metal strength in the joints with the brazing clearance between 0.1-1.5mm, whereas those of the joints which were brazed by using Ag-Pd filler metal increased with decreasing the brazing clearance and attained about 70% of the base metal strength at brazing clearance of 0.1mm.