Titanium has low density, high specific strength, corrosion resistance, high elasticity, low damping, no magnetism and high and low temperature performance, which is known as the “pace metal”, “marine metal”, it is widely used in aerospace, shipbuilding, desalination, chemical, automobile, electric power and other national economy and national defense construction field. Because the seamless titanium tube has the low yield, long production cycle and high cost, the production process of pure titanium welded pipe is short, the production cost is low, and the production efficiency is high, so the development of thin-walled welded pipe has become a trend of pipe production. In Japan, Europe and the United States, titanium welding pipe gradually replaced the titanium and titanium alloy thin-walled seamless pipe to be used in condenser of power plant and nuclear power plant, which is not only improves the heat exchange efficiency, but also improve the condenser and the condenser unit of life to have significant economic benefits.

The data of titanium alloy plate merchant show that it must be guaranteed when the titanium tube is welding.

1. It can not produce large welding residual stress and residual deformation. Therefore, the welding process must be in strict accordance with the construction order and the quality management standards of process.
2. The welding zone metal is not polluted by active gas N, 0, H and harmful impurity elements C, Fe, Mn and so on above 250 degrees.
3. The coarse grain structure can not be formed.

Titanium welding pipe blasting pressure is 61.76MPa, seamless titanium tube bursting pressure is 68.10MPa.

The expansion of welding titanium tube: under the equal expansion pressure, the pull-out force of welding titanium tube is 2.5-3.1MPa bigger than that of titanium seamless tube