The general pipe is used to deliver low pressure fluid. It manufactured with Q195A, Q215A, Q235A steel,and it can also be made of other mild steel which is easy to weld. Steel pipe needs to be carried out water pressure, bending, flattening and other experiments, the surface quality has certain requirements, usually delivery length is 4-10m, often require length (or double ruler) delivery. The specifications of the welded pipe are denoted by nominal caliber (mm or inch). Nominal caliber is different from the actual one. The welded pipe can be divided into ordinary steel pipe and thickened steel pipe according to the specified wall thickness. The steel pipe can be divided into thread and without thread according to the form of pipe end. Sheet 6-17 is welded steel pipe size.
No need to weld and set the wire high-frequency resistance straight welded pipe, do not need to do ground wire, no paint, eliminating the traditional welding and sets of silk and other complex construction processes. Only need to connect pipe and pipe by straight pipe joint, thread pipe joint with round steel pipe theoretical weight and junction box,then using a special tool to tighten (twist off) the screw after position, and the junction box high frequency resistance welds fixed with lock. Pipe bend can be bent corresponding arc with bender.
