Four processing methods of titanium welded pipe!
There are four methods for titanium welded pipe processing:
1. Laminated welded titanium pipe: compared with the multi seam "shrimp" type titanium pipe, there are fewer welds, but the more complicated the tableting process is, the more molds are required, the more materials and processes are consumed, the weld will also affect the corrosion resistance, and the appearance is not ideal.
2. Multi weld type (commonly known as "Xiami Waist" type) titanium pipe: its processing technology is complex. It is usually made by cutting the pipe into multiple bevels, welding it or rolling it into sections under the plate, and then welding it. This method has a lot of leftover materials at the edges and corners, and a large amount of welds. Because the weld will greatly reduce the corrosion resistance, easy to leak, and poor appearance, the inner surface is a folded surface, which increases the pipeline transmission resistance and increases the erosion corrosion at the back, thus reducing the service life.
3. Stamped titanium welded pipe: the appearance of this titanium pipe seems no different from that of the pushed titanium pipe, but this processing technology is to punch the pipe blank into shape in the upper punching die. During the forming process, the back of the titanium pipe is pulled and forced to thin. The inner pipe wall is pressed and thickened, resulting in uneven wall thickness or wrinkling. In addition, the back of the titanium pipe is subject to erosion and corrosion during use. Because the back wall is thin and easy to be damaged early, the overall life of the pipe is greatly reduced.
4. Cast titanium pipe: although it is seamless titanium pipe, the wall thickness (at least 5 mm) cannot match the pipe wall thickness (2 mm~4 mm), which increases the transmission resistance, and the surface finish is poor. More importantly, there are a large number of defects such as air holes generated by manufacturing, which seriously affect the corrosion resistance and life.
The above several titanium tubes are far from meeting the current requirements. The reason why the push titanium tubes are quickly accepted and welcomed by users is that the push titanium tubes have their own characteristics.
Titanium welded pipe is processed with seamless titanium pipe as the blank. The blank with the pipe diameter smaller than the finished diameter is pushed and extruded on the special push extruder. During the forming process, the blank expands. The stress analysis shows that the stress at different parts is different, but under the bidirectional compression, namely axial compression, radial compression and circumferential tension, the stress is always in the tensile state.
