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Improvement of surface quality of titanium ingots and

All domestic production of ingots by vacuum consumable arc furnace melting process. Ingot production capacity of a total of 8 units, 1T vacuum arc furnace of 9 units, actual industrial ingot production units only 4. The annual production capacity of approximately 3000t, maximum size of ingot is 711mm, 3.3T. Electrode welding used tungsten argon arc welding, tungsten inclusion in risk due to this process, since 1980, gradually replaced by plasma arc welding.

Surface quality of titanium ingots has improved significantly in recent years, yield increased from 89% to 93-98%.

Internal quality of titanium ingots most major drawback is the inclusion and segregation. In recent years, due to size of titanium sponge, mixing method and electrode welding process has taken a series of control measures, and its interior quality improved, and Ti-6A1-4V ingots titanium ingot quality is guaranteed. 1980 Anatomy 622mmT1-6Al-4V ingot of composition deviation and morphology analysis results to prove it. Analyzed 253 points, no components of variance. But for high-alloyed and high melting point alloy ingots of large amount of alloying elements, due to low production in the past, may occur during the production process which require further study and solve the problem.

Titanium castings development started in l964. Currently engaged in the research and production of titanium castings unit has 7, total skull furnace for cast iron 8, maximum capacity of 500kg the stove, most of 25-50kg. Modeling method for machining graphite and synthetic resin Binder tamp, water sand has also been put into use. Over the years, primarily for the chemical sector in the production of titanium pump, titanium valves and other products, was widely achieved obvious economic benefits. Also for sectors such as aviation and naval prototype castings, with good results. Titanium castings production modeling techniques are the main problems behind.

Domestic research on precision casting of Aviation Department of Beijing Aviation material Research Institute, Shanghai Institute and the Shenyang Institute of foundry, and mastering graphite-phenol-formaldehyde resin shell and two types: ceramic precision casting shell mold technology, developed a variety of applications of the casting on the plane, study of heat isostatic processing of precision casting of two arts, improving the quality of castings.