초록 ▼

A method of vacuum brazing large assemblies in an enclosed evacuated furnace with brazing material containing a gettering agent in the area of the joints to be formed, including sensing the temperature of the assembly to be brazed adjacent the joints on the exterior surface of the assembly, and shif

A method of vacuum brazing large assemblies in an enclosed evacuated furnace with brazing material containing a gettering agent in the area of the joints to be formed, including sensing the temperature of the assembly to be brazed adjacent the joints on the exterior surface of the assembly, and shifting an additional quantity of gettering agent from a cool zone into a hot zone in the furnace as the surface temperature of the assembly approaches the brazing temperature. A furnace adapted to carry out this method is also disclosed.

대표청구항 ▼

In the vacuum brazing of large metal assemblies having numerous joints to be brazed both at the surface of the assembly and interiorly of the assembly, in an enclosed furnace the operative steps of; placing the assembly to be brazed in the furnace with a brazing material containing a gettering agent

In the vacuum brazing of large metal assemblies having numerous joints to be brazed both at the surface of the assembly and interiorly of the assembly, in an enclosed furnace the operative steps of; placing the assembly to be brazed in the furnace with a brazing material containing a gettering agent in the area of the joints to be brazed, elevating the temperature of the furnace toward the brazing temperature of the metals to be joined, vaporizing an additional quantity of a gettering agent in the furnace as the temperature of the surface of the assembly approaches the brazing temperature of the metals to be joined to supplement the gettering effect of the gettering agent in the area of the surface of the assembly at that time, and elevating the temperature of the furnace for a time to approach the brazing temperature of the joints interiorly of the assembly so that the gettering agent in the area of the interior joints getters the area adjacent those joints. In the vacuum brazing of metal assemblies with plural joints to be formed in an enclosed furnace having a hot zone and a relatively cool zone, the operative steps of placing the assembly in the hot zone of the furnace in the presence of a brazing material in the area of the joints to be brazed with a gettering agent adjacent the joints to be formed, placing a supplemental gettering agent in the cool zone of the furnace, elevating the furnace temperature toward the brazing temperature of the metals to be joined, moving the supplemental gettering agent from the cool zone to the hot zone to vaporize a portion of the gettering agent to getter the furnace volume, and withdrawing the supplemental gettering agent from the hot zone to the cool zone after wetting and flow of the braze material at least at one of the joints but prior to wetting and flow of all the joints to control the amount of gettering agent vaporized.