ã€Abstract】Incoloy800H has high temperature corrosion resistance and has been widely used in modern industry, but it also has many welding problems in the welding process. In this paper, the process evaluation test of combined welding method is used to determine the technical measures to prevent welding cracks and pores. Reasonable welding materials, groove form and welding parameters are selected, and qualified welded joints are obtained to ensure the welding quality and solve the problem. The welding arc welding has the problems of low efficiency and unstable quality.
1 Overview
With the development of the solar photovoltaic industry, solar-grade polysilicon has been greatly developed, and the conversion of the by-product SiCl4 produced in the polysilicon production process into the raw material SiHCl3 has become a common problem faced by domestic enterprises. Cold hydrogenation technology can solve this problem, and it has the characteristics of low energy consumption, high conversion rate and small investment. The hydrochlorination reactor feed waste liquid heat exchanger is a heat exchanger unit of a company's cold hydrogenation unit. The equipment is a vertical fixed structure, the outer dimensions are φ 900mm×14 850mm, and the main material is Incoloy800H.
2. Equipment introduction
(1) The main technical characteristics are shown in Table 1.
(2) The equipment is a vertical floating head single-tube heat exchanger, and the structure is shown in Figure 1.
3. Incoloy800H welding process evaluation
In JB/T4756-2006 "Nickel and Nickel Alloy Pressure Vessel", the domestic brand NS112 is corresponding to the importer brand No. Incoloy800H, but Incoloy800H is used for the first time by our company, and the welding process qualification is required according to NB/T47014-2011.
(1) Incoloy 800H material properties The chemical composition and mechanical properties are shown in Table 2 and Table 3.
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