production process：
1. Uncoiling: Put the coil into the uncoiler and level it.
2. Pre-straightening: Make pre-cut and pre-weld straightening of the steel strip on a spiral leveling machine.
3. Forming: Use H.F welding machine to press the steel strip into a pipe shape, then pass it through the round hole.
4. High frequency welding: Use high frequency welding machine to weld the welded pipe.
5. Size square: Check the welded tube size square and adjust the shape by sizing machine.
6. Internal welding cleaning: Use a water-cooled tool head to remove internal slag and welding sparks.
7. External coating: Use pickling and denoising machine to spray paint the external surface of the welded pipe.
8. Zinc plating: Use high-voltage zinc plating machine to increase the corrosion resistance of the welded pipe.
9. Inspection: Use the professional testing equipment to inspect the welded pipe, and take the corresponding treatment or rejecting measures according to the requirement.
10. Packaging: Pack the welded pipe with special packaging materials to protect the pipe.
HFW welded pipe has high dimensional accuracy, high wall thickness, uniform production efficiency, performance performance and comprehensive mechanical and mechanical properties, as well as perforation, perforation, perforation, etc.
Welding pressure is one of the main parameters of the welding process. After the two edges of the tube blank are heated to the welding temperature, common metal grains are formed under the action of extrusion force, that is, mutual crystallization and welding. The size of the welding pressure affects the strength and toughness of the weld. If the welding pressure applied is small, the metal welding edges cannot be fully pressed, and the non-metallic inclusions and metal oxides remaining in the weld are not easy to discharge due to the low pressure, the weld strength is reduced, and it is easy to crack after being stressed; if the pressure is too high When the welding temperature is reached, most of the metal is extruded, which not only reduces the strength of the weld, but also produces defects such as excessive internal and external burrs or lap welding. Therefore, the optimum welding pressure corresponding to it should be obtained in practice according to different varieties and specifications. According to practical experience, the unit welding pressure is generally 20~40MPa.
Etichetta sexy: pipe hfw
