Relationships Between Brazing Defects and Brazing Conditions
FRANKFORD ARSENAL PHILADELPHIA PA
Pagination or Media Count:
The purpose of the work was to examine and define the causes of defects in silver-brazed steel joints, with the ultimate objective of improving the quality of such joints for army applications. Various conventional and unconventional brazing variables were examined to determine their influence on defect formation. Variables investigated included steel composition, joint clearance, time at brazing temperature, temperature at which filler metal is introduced, orientation of gravitational force, flow path width, filler metal form foil or wire, and brazing atmosphere. It was found that all joints made with flux contained large numbers of defects. The use of foil filler metals was the most helpful option in overcoming this problem in that it produced small, regularly shaped defects whereas capillary flows produced very erratic joint quality, defect size, and defect distribution. Nearly defect-free capillary flows could be achieved in argon atmospheres without fluxes.
- Fabrication Metallurgy
- Couplers, Fasteners and Joints