Technical requirements and quality inspection of straight seam steel pipe according to GB3092 "low pressure fluid delivery with welded steel pipe" standard requirements, the nominal diameter of pipe 6 ~ 150mm, nominal wall thickness of 2.0 ~ 6.0mm, the length of the pipe is usually 4 to 10 meters, According to the length or length of the factory. Steel pipe surface quality should be smooth, do not allow folding, cracks, stratification, welding and other defects exist. The surface of the pipe is allowed to have minor defects such as scratches, scratches, weld misalignment, burns and scarring that do not exceed the negative wall thickness. Allows weld thickening at the wall and the presence of internal welds. Welded steel pipe should do mechanical performance test and flattening test and flaring test, and to meet the requirements of the standard requirements. Steel pipe should be able to withstand a certain internal pressure, if necessary, 2.5Mpa pressure test, to maintain a minute without leakage. Allowing eddy current testing instead of hydrostatic testing. Eddy current testing according to GB7735 "steel pipe eddy current testing method" standard implementation. Eddy current testing method is to fix the probe on the rack, flaw and weld to maintain a distance of 3 ~ 5mm, relying on the rapid movement of the pipe to conduct a comprehensive scan of the weld, flaw detector by the eddy current detector automatic processing and automatic sorting, To achieve the purpose of testing. After the inspection of the welding pipe with the provisions of the length of the saws cut off by the flip frame off the assembly line. Steel pipe ends should be flat head chamfer, print mark, finished tube with hexagonal strapping packaging factory.
