Hardness testing of welded pipe

　　The welded pipe is formed by bending the steel plate or steel strip, and then made by welding. According to the form of weld, it is divided into straight welded pipe and spiral welded pipe. Dividedagain general welded pipe, galvanized pipe, blowing pipe, wire tube, pipe metric, roller tube, deep well pump, tube for automobile, transformer tube, welding, welding of thin-walled tube shaped tube and spiral welded pipe. General welded pipe: ASTM A789 S31803 Stainless Steel Welded Pipe is used to transport low pressure fluid. It is made of Q195A, Q215A and Q235A steel. Also can use other steel easy welding manufacturing. The steel pipe should carry out the test of water pressure, bending and flattening. There is a certain requirement on the surface quality, usually the delivery length is 4-10m, and the delivery is often required. The specification of the welded pipe is expressed in nominal caliber (millimeter or inch). The nominal diameter is different from the actual one. The welded pipe has two kinds of common steel pipe and thickened steel pipe according to the specified wall thickness, and the steel pipe is divided into two kinds according to the pipe end form, which are threaded and non threaded.