Welded pipe, also called welded steel pipe, is largely product of plate or strip after crimping and forming welded steel pipe. Welded steel pipe production process is straightforward, high production efficiency, type of specifications, less equipment, but the overall strength is less than seamless steel pipe. Since the 1930s, with the rapid development of top quality strip rolling production and therefore the progress of welding and inspection technology, the standard of weld is consistently improving, the variability and specifications of welded steel pipe are increasing day by day, and replaced the seamless steel pipe in additional and more fields. Welded steel pipe is split into straight seam welded pipe and spiral welded pipe consistent with the shape of weld.
First, the classification of welded pipes
According to the employment of welding pipe classification method: consistent with the employment and divided into general welding pipe, galvanized welding pipe, blowing oxygen welding pipe, wire casing, metric welding pipe, roller pipe, deep well pump pipe, automobile pipe, transformer pipe, electric welding thin-wall pipe, electric welding shaped pipe and spiral welding pipe.
Two, the scope of application of welded pipe
Welded pipe products are widely utilized in boilers, automobiles, ships, light structure doors and Windows steel, furniture, every kind of agricultural machinery, scaffolding, wire pipe, high-rise shelves, containers and then on. Can meet customer requirements, special specifications of welded pipe will be processed in step with customer requirements.
According to different welding methods, welded steel tubes may be divided into arc welding tubes, high frequency or low frequency resistance welding tubes, gas welding tubes, furnace welding tubes, bundy tubes, etc.
Electric welded steel tube: used for oil drilling and machinery manufacturing.
Furnace welding pipe: is used as gas pipe, straight welded pipe for top pressure oil and gas transmission; Spiral welded pipe is employed for oil and gas transportation, pipe pile, bridge pier and then on.
According to the weld shape classification may be divided into straight seam welding pipe and spiral welding pipe.
Straight seam welded pipe: simple production process, high production efficiency, low cost, rapid development.
Spiral welded pipe: the strength is mostly beyond the straight seam welded pipe, can use a narrower blank to supply larger welded pipe diameter, but can also use the identical width of the blank to provide different welded pipe diameter. But compared with the identical length of straight seam pipe, the weld length increases by 30~%, and therefore the production speed is lower. Therefore, small diameter welded pipe mostly use straight seam welding, large diameter welded pipe mostly use spiral welding.
Post time: Dec-31-2021