Alloys made of titanium and iron, aluminum, vanadium, molybdenum and other metal elements have excellent physical and mechanical properties such as high strength, high heat resistance, good corrosion resistance, etc. They are widely used in high-tech fields such as chemical industry, marine engineering, transportation, medical treatment, architecture, aerospace, military industry and so on. They are important lightweight structural materials, of which aerospace is an important downstream application field.

Medical titanium wire As active metal, titanium alloys are widely used in aerospace, petrochemical and atomic energy industries. The main problems in titanium and titanium alloy brazing are as follows:

① The oxide film on the surface is stable, and titanium and its alloys have a large affinity with oxygen. A very stable oxide film is easily formed on the surface, which can wet and spread solder, so it must be removed during brazing.

② It has a strong tendency to absorb hydrogen, oxygen and nitrogen during heating. The higher the temperature is, the more serious the absorption will be, which will sharply reduce the plasticity and toughness of titanium metal. Therefore, brazing should be carried out in vacuum or inert atmosphere.

③ It is easy to form intermetallic compounds, and titanium and its alloys can react with most needle materials to form brittle compounds, resulting in brittle joints. Therefore, the solder used for brazing other materials is basically not suitable for brazing active metals.

④ The organization and performance are easy to change. Titanium and its alloys will undergo phase transformation and grain coarsening during heating. The higher the temperature is, the more serious the coarsening will be. Therefore, the temperature of high-temperature brazing should not be too high.

In conclusion, the brazing heating temperature must be paid attention to when brazing titanium and its alloys. Generally speaking, the brazing temperature should not exceed 950~1000 ℃. The lower the brazing temperature, the smaller the impact on the performance of the base metal. For quenching aging alloy, brazing can also be carried out under the condition that the aging temperature is not exceeded.

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