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Four kinds of processing methods of titanium welded pipe

Four kinds of processing methods of titanium welded pipe

Dec 21,2021
Titanium welded pipe generally has the following four processing methods:

1. Sheet-pressed welded titanium pipe: Compared with the multi-slit "shrimp" type, this titanium pipeline has fewer welds, but the more complicated the sheeting process is, it requires a lot of molds, consumes more materials and processes, and welds. It will also affect the corrosion resistance, and the appearance is not ideal.

2. Multi-welded (commonly known as "shrimp waist" type) titanium tube: its processing technology is complex, usually by cutting the tube into multiple sections of oblique openings, welding or forming multiple sections under the plate, and then rolling and welding, This method has a lot of leftover material at the corners and a large amount of welds. Because the welding seam will greatly reduce the corrosion resistance, it is easy to leak, and the appearance is not good. The inner surface is a folded surface, which increases the transmission resistance of the pipeline and increases the erosion and corrosion of the back, which reduces the life.

3. Stamped titanium welded pipe: The appearance of this titanium pipe seems to be the same as that of pushed titanium pipe, but the processing technology is to press the tube blank in the upper punching die. During the forming process, the back of the titanium tube is pulled and forced The back is stretched thin, and the inner pipe wall is compressed and thickened, causing uneven wall thickness or wrinkles. In addition, the back of the titanium pipe is subject to erosion and corrosion during use. The thin back wall is prone to premature damage, which greatly reduces the overall life of the pipe.

4. Casting titanium pipe: Although it is a seamless titanium pipe, the wall thickness (at least 5mm) cannot match the pipe wall thickness (2mm~4mm), which increases the transmission resistance, and the surface finish is poor. The more important thing is that there are internal A large number of defects such as pores caused by manufacturing seriously affect the corrosion resistance and life.

The above several kinds of titanium tubes are far from meeting the current requirements, and the advent of the push titanium tube is quickly accepted and welcomed by users because the push titanium tube has its own characteristics.

The processing of titanium welded pipe uses seamless titanium pipe as the blank, and the blank with a pipe diameter smaller than that of the finished product is used on the special pushing extruder to push and extrude. During the forming process, the pipe blank expands. Stress analysis shows that the stress of different parts is different, but under two-way compression, that is, axial compression, radial compression and circumferential tension, the stress is always in a state of tension.
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