The technical requirment and quality inspection of ERW steel pipe

According to GB3092 "welded steel pipe low pressure liquid delivery" standard provisions, the nominal pipe diameter 6 ~ 150mm, nominal wall thickness of 2.0 ~ 6.0mm, the length of pipe is usually 4 to 10 meters, can be cut to length or times foot length of the factory. Steel surface quality should be smooth, does not allow folding, cracks, delamination, lap welding defects exist. Pipe wall thickness of the surface to allow no more than the negative deviation Scratch, scratch, weld dislocation, burns and scarring and other minor defects. Thickening and wall thickness to allow the weld seam welding bars in existence.

Welded steel pipe and mechanical tests should be done flattening test, and flaring test, and to meet the standard requirements. Pipe should be able to withstand a certain pressure, when necessary, 2.5Mpa pressure test, for a minute without leakage. Allows the use of eddy current testing in lieu of hydrostatic testing. Eddy current testing according to GB7735 "pipe eddy current test method" standard. Eddy current method is to probe the rack, testing and maintaining 3 ~ 5mm from the weld, by the rapid movement of the weld pipe comprehensive scanning, eddy current testing signal by the automatic processing and automatic sorting, achieve the purpose of testing.

After testing the pipe with the required length flying saw cutting, frame by turning off the assembly line. Pipe ends should be flat chamfer, marking, hexagonal tubes tied product packaging factory.