Modern steel production has three major categories, namely, welded pipe, seamless pipe and seamless steel pipe.
Welded pipe is a metal strip into a tube by deformation processing, welding in the weld area forming, welding pipe welding process can be divided according to the furnace welding, high frequency resistance welding, TIG and plasma welding, etc; can be divided according to the form of the weld straight seam welding and spiral welding. Pipe injuries have common natural slag, cracks, holes, Weld and so on.
Seamless round tube is perforated or extruder processed into a capillary, and then rolling machine rolling forming small diameter pipes and thin-walled tube also repeated cold rolling - annealing process. Common injuries seamless nature are longitudinal, transverse cracking, warping and folding the inner and outer walls, pits, pitting and delamination.
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seamless pipe is heated primarily by reducing rolling, pickling, lubrication, drawing heat treatment and thermal annealing processes produce seamless steel pipe, steel pipe production of this same inevitably exist Weld Weld inclusions, such as welding and overheating problems. Whether welded steel pipe, seamless steel pipe or seamless steel pipes, cracks are the most common natural defects.
