Titanium has a very wide range of uses in the military industry. Nuclear-powered submarines, hydrofoil boats, mortar barrels, tank shields, bullet-proof vests and many other uses titanium. According to materials, a typhoon-class nuclear submarine uses up to 9,000 tons of titanium, which shows that military engineers have a huge demand for titanium.

Titanium is widely used in the aviation industry, and the amount of titanium used in civil aircraft accounts for about 20-25% of the structural weight; in addition, strategic rocket engines, spacecraft (such as Shenzhou 5 and Shenzhou 6), antennas for artificial satellites, etc. also use titanium a lot. The use of titanium alloy wire in the marine industry

In seawater, titanium has corrosion resistance unmatched by other metal materials, especially resistant to high-speed erosion and corrosion of seawater. At present, the United States, Japan, France, etc. have developed various advanced titanium deep submersibles, submarines, and subsea laboratory equipment for marine research. In addition, coastal power stations, offshore oil production equipment, seawater desalination, marine chemical production, and marine aquaculture are extensive.

Resistance welding is a key technology for the welding of integral blisks, especially those made of dissimilar materials. It has been successfully used in the field of foreign aeroengine manufacturing. At present, my country's aviation industry has begun to study the linear contact welding technology of the titanium alloy dual-function monolithic blisk. Therefore, conducting basic research on titanium alloy linear resistance welding, understanding the joint temperature field, arrangement, and texture evolution process under the conditions of rapid heating, cooling and large deformation such as linear resistance welding, and characterizing the mechanical function of the welded joint is one This is a very urgent mission, which can provide theoretical foundation and experimental data for the engineering and manufacturing of titanium alloy dual-function monolithic blisks. This article focuses on the TC4 and TC11 titanium alloys, which are important materials for the manufacture of aero-engine blades and blisks, and systematically develops the linear resistance welding test research of dissimilar titanium alloys.

High-strength titanium alloy has high strength, its tensile strength is 686-1176MPa, and its density is generally about 4.51g/cm3, which is only 60% of steel. The strength of pure titanium is close to that of ordinary steel. Some high-strength titanium The alloy exceeds the strength of many alloy structural steels. Therefore, the specific strength (strength/density) of titanium alloy is much greater than other metal structural materials, and parts and components with high unit strength, good rigidity, and light weight can be produced. 2 Higher hardness. The hardness HRC of titanium alloy (annealed) is 32～38. The thermal conductivity is small and the modulus of elasticity is small. The thermal conductivity of titanium is λ=15.24W/(mK), which is about 1/4 of nickel, 1/5 of iron, and aluminum. 1/14, and the thermal conductivity of various titanium alloys is about 50% lower than that of titanium.