1. Tabletting welded titanium tube: compared with the multi seam "shrimp" type, the titanium pipe has fewer welds, but the more complex the tabletting process is, a large number of molds are required, many materials and processes are consumed, the welds will also affect the corrosion resistance and the appearance is not ideal.
2. Multi weld type (commonly known as "shrimp waist type") Titanium tube: its processing technology is complex. It is usually made by cutting the pipe into multiple oblique sections, welding, or forming multiple sections under the plate, and then rolling and welding. This method has a large amount of residual materials at the edges and corners and a large amount of welds. Because the welds will greatly reduce the corrosion resistance, easy to leak, and have poor appearance, the inner surface is a folded surface, which increases the transmission resistance of the pipe, increases the erosion and corrosion at the back, and reduces the service life 。
3. Stamping titanium welded tube: the appearance of this titanium pipe seems to be no different from that of the pushed titanium tube, but the processing process is to punch the tube blank in the stamping die. During the forming process, the back of the titanium tube is pulled and forced to thin, and the inner pipe wall is pressed and thickened, resulting in uneven or wrinkled wall thickness. In addition, the back of the titanium tube is subject to erosion and corrosion during use. Due to the thin back wall, it is easy to be damaged early, The overall service life of the pipeline is greatly reduced.
4. Cast titanium tube: although it is a seamless titanium tube, the wall thickness (at least 5mm) can not match the tube wall thickness (2mm ~ 4mm), which increases the transmission resistance and poor surface finish. More importantly, there are a large number of defects such as pores caused by manufacturing, which seriously affect the corrosion resistance and service life.
The processing of titanium welded tube takes seamless titanium pipe as blank, and the blank with diameter less than the diameter of finished product is pushed and extruded on a special push extruder. During the forming process, the pipe blank expands.
