1. Compression welded titanium pipe: Compared to the multi seam "shrimp rice" type, this titanium pipe has fewer welds, but the more complex the compression process is, requiring a large number of molds, consuming more materials and processes. The welds also affect corrosion resistance and the appearance is not ideal.
2. Multi weld type (commonly known as "shrimp waist" type) titanium pipe: Its processing process is complex, usually using cutting the pipe into multiple inclined sections, welding or forming multiple unfolded materials under the plate, and then rolling welding. This method has more leftover materials at the edges and corners, and a large amount of welding seams. Due to the greatly reduced corrosion resistance, easy leakage, and poor appearance of the weld seam, the inner surface is a folded surface, which increases the transmission resistance of the pipeline and increases the erosion and corrosion at the back, reducing the service life.
3. Stamped titanium welded pipe: This type of titanium pipe appears to have no difference in appearance from the pushed titanium pipe, but the processing process involves stamping the pipe blank into a stamping die. During the forming process, the back of the titanium pipe is pulled and forced to thin, and the inner pipe wall is thickened due to pressure, resulting in uneven or wrinkled wall thickness. Additionally, the back of the titanium pipe is subjected to erosion and corrosion during use. Due to the thin back wall, it is prone to early damage, greatly reducing the overall lifespan of the pipeline.
4. Cast titanium pipe: Although it is a seamless titanium pipe, the wall thickness (at least 5mm) cannot match the pipeline wall thickness (2mm~4mm), which increases transmission resistance and has poor surface finish. More importantly, there are a large number of defects such as manufactured pores inside, seriously affecting corrosion resistance and service life.
The above types of titanium tubes are far from meeting current requirements, and the introduction of push made titanium tubes was quickly accepted and welcomed by users because they have their own characteristics.
The processing of titanium welded pipes is based on seamless titanium pipes as billets, which are pushed and extruded into shape using billets with a diameter smaller than the finished diameter on a special extrusion machine. During the forming process, the billets expand. Stress analysis shows that the stresses in different parts are different, but under biaxial compression, namely axial compression, radial compression, and circumferential tension, the stress remains in a tensile state.
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