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TZM alloy gas tungsten arc welding process and welded joints

TZM molybdenum alloy with a high melting point, high elastic modulus, low coefficient of thermal expansion, good electrical and thermal conductivity, corrosion resistance and high temperature mechanical properties and other characteristics, therefore TZM is widely used as a high temperature of mold industry and the field of aviation, aerospace alloys, such as torpedo engine with valve body, rocket nozzles, gas piping, nozzle throat insert, machinery industry used to do black and non-ferrous metal die-casting mold materials and seamless stainless steel pipe piercing plug, such as engine the rotor of the copper molds, etc. TZM molybdenum alloy mostly prepared by powder metallurgy, get TZM under a high-temperature protective atmosphere high-temperature and then after the high-temperature hot-rolled, annealing, hot-rolled in the temperature, medium-temperature annealing, and then warm-rolled to obtain TZM sheet. TZM alloy as a structural material, often by welding to obtain the desired shape and configuration. Therefore, the research on whether TZM molybdenum alloy can be welded, which welding process can obtain good welded joints, welded joints has any organization and performance issues.

The test of material has prepared by powder to make TZM molybdenum alloy, and then after an appropriate process rolling to give the TZM alloy sheet, according to the particular structural it need to determine the sheet thickness of 2.5mm. The TZM alloy plate base body tissue rolling　

obtained has obvious directionality, i.e., parallel to the rolling direction was fibrous texture. This very long flat shaped grains consisting of texture, not only greatly improve the plasticity of the material, while improving the tensile strength of the material.

TZM molybdenum alloy is easily oxidized, and even a very small amount of oxygen atoms can easily be formed in the molybdenum MoO2 and segregation at the grain boundary in the form of a single molecular layer, thereby significantly reducing the molybdenum in the bonding strength of the grain boundaries, resulting in molybdenum The intergranular embrittlement off, a more practical welding method by TIG welding, in order to prevent the alloy is oxidized in the welding process or inhaled nitrogen and other impurities.

TZM molybdenum alloy plate by TIG welding, can effectively prevent the alloy to oxidation and the ingress of oxygen and nitrogen element in the welding process. The preferred welding parameters: the welding speed 4 mm / s, an argon gas flow 10L/min conditions, the welding current should be controlled at around 210A.

After welding of the weld of coarse grains, and due to the thermal effect of the welding process, the partial elimination of the lamellar fibers are formed in the when TZM master rolling texture, weakening the strength of the material, but suitable to improve the resilience of the plastic material maintain sufficient strength, and can basically meet the the ordinary structural parts requirements.

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