The quality of titanium plate depends on the smelting process
Titanium plates have high corrosion resistance and specific strength, and are widely used in power, chemical, aviation parts, building materials, sports equipment, medical and other fields, and are still expanding. Titanium plate has the advantages of low price, high performance, many functions and easy production.
The quality of the titanium plate is largely dependent on the smelting process, including the chemical composition of the titanium, the cleanliness of the titanium water (gases, harmful elements, inclusions) and the quality of the billet (component segregation, decarbonization and surface condition), which are key control points for the smelting operation. In addition, industrial titanium plates also require adequate hardenability to ensure uniform microstructure and mechanical properties of the entire spring section. The oxide inclusion in titanium is the main cause of fatigue cracks, and the damage to fatigue life of D inclusion is greater than that of B inclusion. Therefore, foreign titanium plants and automobile plants put forward higher requirements for oxide inclusions in industrial titanium plates. For example, the Swedish SKF standard requires that the oxygen content in titanium is less than 15×10~(-6), and the oxygen content of D-type inclusions is lower than that of B-type inclusions.
Because of its special physical and chemical properties, the welding process of titanium plate is very different from other metals. Titanium welding is a TIG welding process that uses inert argon to effectively protect the welding area. Before using argon, check the factory certificate of the bottle, confirm the purity index of argon, and then check whether the bottle valve leaks or fails. Pollution of metal inactive gas NOH and harmful impurity element CFeMn in welding zone above 250℃. Purity is not less than 99.98%, water content is less than 50mg/m32 argon, industrial grade pure argon, can form coarse crystal structure. The welding process must be carried out according to the predetermined construction sequence, and can not produce large welding residual stress and residual deformation.