⑴ hydroformed bellows hydroforming is the most common method of forming the bellows. The use of fluid pressure in the tube, the tube is in the limit ring bulging bellows price until the ring to appear along the yield, and then compress the tube to the desired length. Small diameter bellows adopt this method. ⑵ bellows roll forming roll forming process is mainly used for processing large bellows, is to rely on in the roll forming tube forming wheel, you can roll into a single wave-shaped bellows specifications, some devices may once into a few ripples. ⑶ mechanical bulging Bellows dilatation of the tube inside the tire tool, individually pressed into corrugated expansion, after the initial shaping, then Kun coining customized inside and outside. ⑷ welded bellows for forming wave height is too large or waveform special bellows, the use of stamping and welding processes. When the wave height exceeds the limit, the extension rate of the material forming process does not allow the use of a whole, or for complex waveforms, the overall shape is extremely difficult when you have to use more welding forming. Such bellows can not withstand the internal pressure, do not apply for flexible expansion joint segment. ⑸ bellows forming the deposition process is the use of electrodeposition method bellows material is deposited onto the mandrel, the mandrel is then corroded. This bellows material is a very soft metal material of pure nickel, and is non-porous, and therefore, the ability of high vacuum bellows, and can be welded. Expansion joints flexible bellows segment should not use this plastic bellows, because the cost is too high, and is limited to nickel material. Double-wall corrugated pipe with constantly updated technology, the use of more and more in the industry. Factors affecting the quality of double-wall corrugated pipe, many of them double-wall corrugated pipe material selection is also an important factor. You should double-wall corrugated pipe material How to choose? Double-wall corrugated pipe material should be met: First, has good weldability. Has good weldability to meet double-wall corrugated pipe welding process requirements. Two, with good ductility. This facilitates processing of the bellows, and in the treatment process to meet the hardness and strength requirements. Three, has good corrosion resistance. Generated bellows meet to work under different environments. Four, with the fatigue strength, tensile strength and high elastic polarity. This ensures that the bellows normal work. Double-wall corrugated pipe | Xiong Yu-tai (certified) | Luohe bellows provided by Xiong Yu Thai plastic products factory. Xiong Yu Tai Plastic Products Factory (www.taiyusuye.com) Hebei Baoding, UPVC pipe leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Xiong Yu-tai in leadership with the staff warmly welcome all inquiries negotiations to create Xiong Yu-tai a better future.