Straight seam welded pipe
Straight seam welded pipes are formed by bending steel plates or strips and then welded. Divided into straight seam welded pipe and spiral welded pipe. According to the purpose, it can be divided into general welded pipe, galvanized welded pipe, oxygen welded pipe, wire bushing, metric welded pipe, idler pipe, deep well pump pipe, automotive pipe, transformer pipe, welded thin-walled pipe, welded special-shaped pipe and spiral welded pipe.
General welded pipe
Typically welded pipes are used to deliver low pressure fluids. Made of Q195A, Q215A, Q235A steel. It can also be made of other mild steels that are easy to weld. The steel pipe should be subjected to hydraulic pressure, bending, flattening and other tests. It has certain requirements on the surface quality, usually the delivery length is 4-10m, and often requires length (or multiple feet) delivery. The specification of the welded pipe is expressed by the nominal diameter (mm or inch). The nominal diameter is different from the actual one. The welded pipe has two kinds of ordinary steel pipe and thicker steel pipe according to the specified wall thickness. The steel pipe is divided into two types according to the pipe end, with or without threads. Table 6-17 is the size of the welded steel pipe.
There is no need for electric welding machines and high-frequency-resistance straight seam welded pipes, and it is not necessary to make cross-grounding lines and do not need to paint, eliminating the need for complicated construction processes such as traditional fusion welding and bushings. Simply connect the straight pipe joint to the pipe, the threaded pipe joint to the theoretical weight of the round steel pipe and the junction box. After positioning, use a special tool to tighten (screw) the screw, and use the lock nut to lock the high frequency resistance of the terminal box. Can be set. The pipe bender can bend the corresponding arc with the bender.