Method for welding molybdenum alloy

Abstract

The invention discloses a method for welding molybdenum alloy, belonging to the technical field of metal welding. The method comprises the steps: (1) after cleaning, drying the welding area of molybdenum alloy; (2) manufacturing a special welding wire for the molybdenum alloy; (3) degassing at high temperature; (4) taking out a molybdenum alloy workpiece, spraying an active agent until the thickness is 0.2-0.8mm on the he welding area of molybdenum alloy, heating the special welding wire for the molybdenum alloy to dry, and then welding the molybdenum alloy workpiece, wherein the welding method adopts TIG wire filling welding, adopts a direct-current straight polarity power supply and determines welding process parameters; (5) cooling; (6) inspection. The method can reduce the quantity of joint holes, improve weldability, reduce cracks, refine parent crystalline grains so as to improve the tensile property of welded joints, and obtain good welding quality.

Description

technical field

[0001] The invention belongs to the technical field of metal welding, and in particular relates to a molybdenum alloy welding method. Background technique

[0002] Molybdenum alloy has the characteristics of high melting point, good high temperature performance, good thermal and electrical conductivity, small expansion coefficient, good thermal shock resistance, strong wear resistance and corrosion resistance, high sound velocity, etc., making it widely used in chemistry, metallurgy and metal processing, It has been widely used in electronics industry, aerospace and nuclear industry, military and other fields, and it is one of the refractory metal materials with very promising application prospects. With the further research on molybdenum alloy and its wider application in various fields, it is particularly important and urgent to carry out research work on molybdenum alloy welding technology. Improving the weldability of molybdenum alloy and obtaining high-q...

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