BRAZING METHOD OF STAINLESS STEEL MATERIAL AND AL MATERIAL

摘要

PURPOSE:To accomplish defectless brazing with high strength and to eliminate the inconvenience owing to the use of a flux by providing a specific metallic layer on the surface of a stainless steel material and joining said material to an aluminum material clad thereon with a prescribed brazing material by vacuum brazing or inert gas brazing. CONSTITUTION:A stainless steel material is immersed in pure Al or Al-Si alloy or is plated thereon with Ag or Sn to about 5-100mu layer thickness. On the other hand, an Al-Si-0.2-0.3%Mg brazing material for vacuum brazing or Al-Si-Be- Bi brazing material for inert gaseous atmosphere brazing is clad on the adhering surface of the Al material. Both materials are pressurized and heated in a vacuum heating furnace or inert gaseous atmosphere furnace by which the materials are brazed. Both materials are brazed satisfactorily with high strength and since no flux is used, no harmful gases are generated and the need for the cleaning treatment for the residue is eliminated.