Since the discovery of element titanium at the end of the eighteenth century, with continuous research and practice on the properties, smelting, industrial production, and processing of titanium, it has been widely used in foreign industrial fields at the end of the 1950s and has become a new development. A promising metal material. It is considered to be the fourth metal after copper, iron, and aluminum widely used by mankind. Because titanium and its alloys have excellent corrosion resistance, good comprehensive mechanical properties, high specific strength, low wettability to liquids, and resistance to fluid erosion, they are gradually being used in military and civilian industries. . my country is one of the countries with the most abundant titanium resources in the world, which provides a broad and good prospect for the application of titanium.
In the vacuum salt production, the fluctuation part of the liquid level of the evaporation tank is to ensure that the inner wall of the tank is flat and smooth. A non-penetrating welding structure is adopted between the titanium insert and the titanium clad layer. This structure has strict manufacturing requirements, and the weld seam is relatively fragile. In the design, it should be considered that this part is made on the ground at one time and hoisted as a whole, which is conducive to manufacturing and welding. At the same time, the equipment should have sufficient rigidity to prevent the titanium weld from cracking due to the deformation of the equipment during transportation and installation.
Titanium is a metal with excellent corrosion resistance, but it is also a delicate metal. According to relevant information, the cleanliness of the titanium surface and even fingerprints can also affect the welding quality. Iron pollution, improper welding process and welding specifications, and reliable protection without high-purity argon can greatly reduce the corrosion resistance of titanium. In the entire manufacturing process, the operation should be strictly in accordance with the manufacturing regulations of titanium, especially the protection of the titanium surface and the quality of welding, so as not to reduce the excellent corrosion resistance of titanium. The 100% colored flaw detection of titanium welds and titanium inlay strips, and the reverse ventilation leak detection of titanium cover welds have proved in practice to have a good effect on the inspection of possible cracks, pores and other defects in titanium welds. Color flaw detection and ventilation leak detection should be carried out strictly in accordance with the procedures. After the titanium-steel clad plate is compounded, the titanium surface is not pickled, and the titanium surface will inevitably be polluted during the compounding process. In the process of making titanium equipment, although many protective measures have been taken, it is still difficult to make a large area of titanium surface completely pollution-free in practice. After the equipment is finished, it is absolutely necessary to pickle the titanium surface. After the titanium surface of the 300,000-ton vacuum salt-making project of Da'an Salt Factory was fully pickled, in addition to the iron contamination inspection, the small holes, cracks and other defects on the surface of the raw materials were also inspected, which helped eliminate the problem before operation.
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