Sleeved pipe resistance welding vacuum packaging method

Abstract

The invention provides a vacuum packaging method for resistance welding of cladding tubes. The sample is placed in a metal cladding tube with one end closed; the inside of the metal cladding tube is evacuated to a set vacuum through the open end of the metal cladding tube. After the temperature is reached; the metal sheathed tube is placed between the two electrodes, and a current is passed through the two electrodes. After the area between the two electrodes is heated to the set temperature, the heated area is pressurized by hydraulic flat-nose pliers, so that the heated area is sealed. The welded joints are used to seal the specimen in the metal-clad tube. The invention has good vacuum effect, high production efficiency, high sealing and welding efficiency and success rate, simple structure and low production cost.

Description

technical field [0001] The invention relates to an experimental method for vacuum sealing and welding of cladding tubes, which is suitable for heat treatment experiments or material preparation when there is no vacuum heat treatment furnace, or when raw materials need to be kept in vacuum during the preparation process (such as hot isostatic pressing preforms), It belongs to the field of material heat treatment and material preparation. Background technique [0002] At present, high-temperature quartz glass is used as the jacket tube in the vacuum packaging process of heat treatment. After vacuuming, a hydrogen-oxygen flame gun is used to heat the quartz tube to soften the quartz tube and shrink and close under the action of atmospheric pressure to complete the vacuum package. , the heating time needs to be strictly controlled during the packaging process, holes are prone to appear in the softened part of the quartz tube, and the air will flow into the vacuum system instantl...

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Problems solved by technology

[0002] At present, high-temperature quartz glass is used as the jacket tube in the vacuum packaging process of heat treatment. After vacuuming, a hydrogen-oxygen flame gun is used to heat the quartz tube to soften the quartz tube and shrink and close under the action of atmospheric pressure to complete the vacuum package. , the heating time needs to be strictly controlled during the packaging process, holes are prone to appear in the softened part of the quartz tube, and the air will flow into the vacuum system instantly, which will cause serious damage to the vacuum pump; because the quartz tube is relatively brittle, if the raw material is a quartz tube as the casing, it will not be able to hot isostatic pressing

[0003] The sealing and welding of the cladding tube used in the hot isostatic pressing preparation process is mainly carried out in the vacuum degassing furnace. The cladding tube is placed in the vacuum degassing furnace. Beam welding or other welding techniques are used to seal the sheath, which has low production efficiency and high cost; in addition, because the sheath tube is sealed and welded in a vacuum furnace, it is impossible to detect whether the sheath tube is leaking when the sealing is completed

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