Stainless steel pipe
The main types of stainless steel pipe welding:
- TIG (tungsten electrode welding in inert gas, without filler metal);
- Plasma welding (in combination with TIG);
- HF (high-frequency current welding);
- Laser (laser welding);
- Electron beam (electron-beam welding).
In practice, the first three methods are mostly used, while the others, due to high cost and complexity of the technology are rarely used. The choice of one or another method of welding depends mainly on where and in what area the stainless pipe will be used.
TIG tungsten electrode
Tungsten electrode welding is carried out under the protection of inert gases. It is a type of arc welding, where the arc itself serves as a heat source. The weld, you get a highly reliable, by heating the nearby layers to the welding point, though quite wide and rough. Welding
in this case is carried out in automatic mode. Shielding gas is fed directly to the welding area from both sides, both outside and inside the pipe. Unfortunately, the appearance of the product will not be so beautiful, because during welding thermal changes in the adjacent layers of the material are inevitable — the so-called white lines are formed. They do not affect the strength of construction, and if aesthetically is not so important, then you can use this method to obtain the permanent connection.
HF-welding with high frequency currents
This method does not use an electrode — metal surfaces are heated by alternating currents at high frequency. The weld, in this case, is perfectly straight and aesthetically more attractive, and the speed of the weld itself is much higher. Hence, the lower cost compared to electric arc welding. But, such a tube is limited applicability in constructions working in torsion, or under great pressure, as weld may have voids and therefore not as strong, but as for the aesthetic side of the issue, HF-welding is more attractive for interior decoration, when strength is not so important.
Finishing
With regard to finishing, then much depends on the application, which is determined by the quality of the surface. For example, pipes can be heat-treated, polished, buffed, and electro-polished. Polishing stainless steel pipes is mainly used in the food industry where they come into contact with products such as milk, flour and dough.
Furnizor
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