Metal bellows have the characteristics of pressure, axial force, lateral force or bending moment can produce the corresponding displacement, and with pressure, vacuum seal, corrosion resistance, temperature stability and long service life and other properties. Therefore, many industrial fields are more and more widely used. Bellows as a seal isolation element in the valve application. A variety of bellows valves, whether it is cut-off valve, throttle, regulating valve or pressure relief valve and other waterproof casing, bellows are sealed as a packing seal element. Valve work, the bellows together with the stem axial displacement and reset. At the same time it also withstands fluid pressure and guarantees sealing. Compared with the packing seal valve, bellows valve with higher reliability and service life. Therefore, the bellows valve in the nuclear industry, petroleum, chemical, pharmaceutical and aerospace industries such as widely used. In practice, the bellows is often welded with other components such as flanges, spigots and stems to form a bellows assembly. Welding has become an indispensable component in the production of bellows an important process. With the development of scientific research and production, new requirements are put forward on the corrugated pipe welding tools and equipment.
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