At present, the manufacturing process of titanium pipe fittings on the market is basically mature, but the use of titanium pipes has always been restricted by cost. Especially for pipe fittings with specific requirements such as thin-walled pipes, high-strength pipes, and longer pipes, titanium seamless pipes, The production is difficult, the equipment is complicated, the cycle is long, and the yield is low. Therefore, titanium welded pipe fittings came into being.
Titanium pipes are not without corrosion in the service environment. Some scholars have found that the pure titanium condenser tube has severe corrosion perforations and edge cracks on the inner and outer surfaces after 15 years of service. In addition, in the process of assembly and application of titanium pipes, it is often necessary to process the pipes such as bending, welding, and end processing. Due to the high elasticity ratio of titanium pipe fittings, the spring back is obvious during bending, and excessive springback makes it difficult to control the geometry and accuracy of the pipe.
Some scholars have used finite element simulation to analyze and predict the springback phenomenon of Ti-3A1-2.5V tube in the cold bending process, but the process is quite complicated and the forming is difficult to control. Due to its strong chemical activity, high melting point, poor thermal conductivity, and other physical and chemical properties, titanium pipes are prone to defects such as pores and cracks during welding, which requires high welding equipment and protection devices. These are all factors that restrict the wide application of titanium alloy seamless pipes.
In the process of pipe processing, the deformation of the pass obviously affects the performance of the pipe. Large deformation can not only improve the production efficiency, but also break the coarse as-cast structure as better as possible to make the tube grain fine and uniform, but too large a deformation will increase the resistance of the tube to form, and the generated deformation heat will increase the local temperature and cause deformation Uneven, abnormal growth of crystal grains. A reasonable amount of deformation can form a texture in the radial, axial, and circumferential directions of the pipe, thereby improving performance.
Some scholars have found that during the rolling process of pure titanium pipe fittings, when the Q value is between 1.2 and 2.3, a strong radial texture is formed, which improves the performance of the pipe. At the same time, a reasonable annealing process, straightening process, and high-efficiency degreasing method are all key to ensuring the quality of titanium pipe fittings.
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