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Research on welding fixture of pure nickel pipeline

Pure nickel has unique physical, chemical and corrosion resistance properties, and can be used in a variety of harsh corrosion environment or high temperature environment, so it is favored by users of special scientific research projects and nuclear industry projects. For example, the key equipment of nuclear power plant molten salt production reactor liner is made of pure nickel. Because the manufacture of lining tube of molten salt production reactor involves the welding of pure nickel material, how to ensure the welding quality of pure nickel material becomes the key to ensure the manufacturing quality of equipment.

In the welding process of pure nickel materials, if the protective gas can not effectively protect the molten pool, excessive oxygen will be dissolved in the high temperature liquid nickel and NiO will be generated. NiO reacts with hydrogen and carbon in the liquid metal to produce H2O and CO. It is too late to escape from the molten pool during solidification, and the residual pores form in the weld, which greatly affects the welding quality of pure nickel materials. At the same time, the linear expansion coefficient of nickel material is large, and the stress contraction leads to cracks and other defects, which will seriously affect the manufacturing quality of equipment.

After many times of test and design improvement, we constantly optimize the welding process of pure nickel pipeline, and finally design and manufacture the lining tube welding tooling of the fourth generation nuclear molten salt production reactor, which greatly improves the welding quality and successfully produces qualified products. This welding tool also accumulated experience for improving the welding quality of similar nuclear power equipment in the future.

(1) Argon protection is a very key factor affecting the quality of pure nickel welding. Argon protection on the back of welding can be improved through welding fixture to prevent harmful gas from entering and effectively prevent welding defects such as porosity and cracks.

(2) For the welding of pure nickel pipe, it is necessary and very important to design tooling specifically to prevent crystallization crack. This design concept has accumulated experience for improving the manufacturing quality of similar nuclear power equipment in the future.
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