Zirconium is a chemically very active element. It is easy to react with various gases in the atmosphere at high temperatures and is corrosion-resistant. It is used in petroleum, chemical, atomic energy, and other industries. When zirconium is welded, the welding and heat-affected zones are easily affected by the air. Oxygen, hydrogen nitrogen, and other elements are polluted, forming hard and brittle compounds, resulting in a brittle needle-like structure, the hardness and strength of welded joints increase, and the plasticity decreases.
Therefore, when welding zirconium, it is necessary to fully protect the molten pool, welding, and heat-affected zone, and completely isolate the air. The welding of zirconium plates generally uses tungsten inert gas shielded welding. Zirconium plate's other welding methods include electron beam welding, plasma arc welding, and resistance welding. The thermal expansion coefficient and elastic modulus of zirconium are small, so the welding deformation and welding residual stress are small. In the case of no pollution, the weld is not prone to crystallization cracks and cold cracks. It is easy to react to the atmosphere at high temperatures. It begins to absorb oxygen at 200, hydrogen at 300, and nitrogen at 400.
Another major problem of zirconium welding is that the welding is excessively softened, the welding object is easy to dislocate, and the weld at the root is easy to burn out. Therefore, when welding zirconium, it is necessary to properly fix the welding object, and try to use double-sided welding, except for titanium, niobium, and silver. , vanadium, and zirconium can not be directly welded with other metals.
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