Four kinds of titanium welded pipe processing method

Titanium welded pipe processing generally has the following four methods:
1. Sheet welding titanium pipe: compared with the multi-slit "shrimp" type, the titanium pipe is less weld, but the more complicated the sheet technology, the need for a large number of molds, the consumption of materials and processes, the weld will also affect the corrosion resistance, the appearance is not ideal.

2. Multi-weld type (commonly known as "shrimp waist" type) titanium tube: its processing technology is complex, usually the tube is cut into multiple sections of diagonal, welded or plate into multiple sections of expansion material, and then coiled welding. This method has more corner material and a large amount of weld. Because the weld will greatly reduce the corrosion resistance, easy to leak, and the appearance is not good, the inner surface is broken, increase the transmission resistance of the pipeline and increase the erosion corrosion of the back and reduce the life.

3. Stamping titanium welded pipe: The appearance of the titanium tube and push titanium tube seems to be no difference, but the processing technology is the tube blank in Chong Song stamping die stamping forming, forming process of titanium tube back tension, and force back pull thin, inner tube wall compression and thickening caused by uneven wall thickness or wrinkle, and the use of titanium tube back erosion corrosion, due to the back wall thin early loss, the overall life of the pipeline is greatly reduced.

4. Cast titanium pipe: although there is no titanium pipe, but the wall thickness (at least 5mm) and the pipe wall thickness (2mm~4mm) can not match, thus increasing the transmission resistance, and the surface finish is poor, the most important is that there are a lot of internal defects produced by the pores, seriously affect the corrosion resistance and life.

The above titanium tubes are far from meeting the current requirements, and the advent of push titanium tubes, the reason why it is quickly accepted by users and popular because push titanium tubes have their own characteristics.

The processing of titanium welded pipe is made of unslotted titanium pipe as billet. The billet whose pipe diameter is smaller than the finished caliber is pushed and extruded on a special pushing and extruding machine. In the forming process, the tube billet expands. The stress analysis shows that the stress is different in different parts, but under bidirectional compression, that is, axial compression, radial compression and circumferential tension, the stress is always in a tensile state.