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A method of atomically bonding a titanium workpiece by heating or pressurizing it, or a combination of both, with or without filler material.
Titanium and titanium alloy commonly used welding methods are: melt welding, brazing, solid bonding, mechanical bonding, bonding and so on. Among them, melt welding is the most widely used, which can be divided into arc welding, electron beam welding, resistance welding and so on. The most commonly used is emotional gas (mainly hydrogen) protection welding, also known as hydrogen arc welding.
The weldability of titanium material depends on the chemical activity and physical properties of the material itself. At room temperature, the surface of titanium has thin and dense oxide film, stable performance. Sharp increase with the increase of temperature, the activity of titanium, when welding temperature higher than 600 ℃, the density of the oxide film was damaged, gas can through the internal diffusion to metal oxide film loose, and hydrogen, oxygen, nitrogen and other elements to produce violent chemical reaction, these elements exist in interstitial impurity in titanium, decreased its welded joint performance especially in plastic. The presence of hydrogen is also often the cause of porosity and cold crack in the weld. See Figure 13-1 for the classification of titanium welding methods.