Titanium strip material in industrial production is a prerequisite for further production of high-quality titanium welded pipe. late 20th century, despite the introduction of small-diameter titanium welded pipe production lines from abroad, but the titanium strip coil is still dependent on imports, the country can not provide quality thin-walled titanium welded pipe with the strip billet. Its use is the domestic Gr.2, thickness 0.3 mm titanium strip, titanium welded pipe forming, welding test. The domestic titanium strip although the plate shape is not good, the thickness of the size of the poor, but the mechanical properties fully meet the standard requirements.
With the domestic Gr2 grade, thickness 0.3 mm titanium strip titanium welded pipe forming and welding test can be found, the first problem encountered in the process is that titanium back to the elastic energy, forming a high degree of difficulty. Because the titanium material itself is low modulus of elasticity, high flexural strength ratio, cold processing rebound, to the processing of titanium products has brought some difficulties.
And the thickness of the titanium belt is too thin, the material belt edge in the case of uneven force is very easy to produce deformation, when the titanium belt deformation degree exceeds the elastic limit, it is easy to produce bulging, wavy edge, etc., resulting in the inability to titanium pipe welding. The band was removed from the roll forming process and the forming effect was observed. It is obvious that the forming process is serious bulging, wavy edge, resulting in the inability to weld or welding perforation, welding quality is unstable, can not ensure continuous production.
Well formed titanium belt is the premise of continuous production of titanium welded pipe, can not ensure the stability of the titanium belt is not continuous and stable production of high-quality titanium welded pipe if the production of ultra-thin-walled titanium welded pipe is more difficult. Good plate shape, suitable performance, uniform thickness is one of the prerequisites to ensure good forming of titanium tubes. In addition, good forming is also closely related to the layout of the unit stand, the accuracy of the unit processing and assembly, and the design of the roll arc. In order to successfully develop a well formed ultra-thin-walled titanium welded pipe, we not only developed a corporate standard for the procurement of titanium strip for titanium welded pipe based on the previous development experience, but also optimized the roll arc of the forming section in order to adapt to the cold bending of ultra-thin-walled titanium strip.
