A vacuum-furnace brazing technique by which beryllium tubes can be lap brazed to 405 stainless steel and other high-temperature alloys has been developed. This is accomplished by pre-placing BT braze alloy between cleaned joint surfaces, imposing a small mechanical pressure on the joint, and heating to about l470°F in a vacuum (<1 micron). The resultant lap joints have a shear strength up to about 7,000 to 8,000 psi at 750°F. Six brazed tube assemblies were prepared according to specifications.
展开▼
