Application of vacuum electron beam welding to molybdenum-rhenium alloy welding

Abstract

The invention relates to the field of vacuum electron beam welding in the equipment manufacturing industry, in particular to application of vacuum electron beam welding to molybdenum-rhenium alloy welding. Molybdenum-rhenium alloy is used as a material for powder metallurgy manufacturing, is sensitive to environmental carbon, nitrogen and oxygen, is easy to oxidize under high-temperature conditions, is easy to form pores, brittle phases and cracks in the welding process, and high-quality welding and forming of the molybdenum-rhenium alloy is realized by utilizing the characteristics of variousparameters of vacuum electron beam welding; and the molybdenum-rhenium alloy is a molybdenum alloy which takes molybdenum as a base and is added with 2%-5% of rhenium. Molybdenum is added into rhenium, the plasticity and strength of molybdenum can be improved, and rhenium belongs to a solid solution strengthening type alloy. The molybdenum-rhenium alloy is generally manufactured by a powder metallurgy method, tensile strength, ductility and resistivity of the molybdenum-rhenium alloy are increased along with increase of rhenium content, and the molybdenum-rhenium alloy is generally applied tothermocouple wire materials, structural materials in aerospace or high-temperature structural materials.

Description

technical field [0001] The invention relates to the field of electron beam welding in equipment manufacturing industry, and relates to the application of vacuum electron beam welding to molybdenum-rhenium alloy welding. Background technique [0002] Molybdenum and molybdenum alloy materials have many advantages in high-temperature applications. Adding molybdenum to molybdenum can improve the plasticity and strength of molybdenum, and has excellent high-temperature and low-temperature mechanical properties. It has been widely used in high-speed rotating X-ray tube targets, microwave Long-life communication grids, space reactor core heating tubes, high-temperature furnace heating elements, high-temperature thermocouples, etc., but the current powder metallurgy molybdenum and molybdenum alloy welding processes are prone to pores, cracks and other defects that cannot meet product requirements. [0003] The invention utilizes the high-energy beam current density and parameter set...

AI Technical Summary

Problems solved by technology

[0002] Molybdenum and molybdenum alloy materials have many advantages in high-temperature applications. Adding molybdenum to rhenium can improve the plasticity of molybdenum and increase the strength of molybdenum, and has excellent high-temperature and low-temperature mechanical properties. It has been widely used in high-speed rotating X-ray tube targets, microwave Long-life communication grids, space reactor core heating tubes, high-temperature furnace heating elements, high-temperature thermocouples, etc., but the current powder metallurgy molybdenum and molybdenum alloy welding processes are prone to pores, cracks and other defects that cannot meet product requirements