The importance of seamless tube end defect detection after welding

Seamless steel ingot made of perforated or solid through the capillary tube, and then by hot-rolled, cold-rolled or cold call is made. Seamless steel hollow section with a lot of fluids used for pipeline transportation, such as the transportation of oil, natural gas, gas, water and some solid materials, pipes and the like. Compared to other steel and solid steel bar, the same torsional strength in bending, lighter, is an economic cross-section steel, widely used in the manufacture of structural parts and mechanical parts, such as drill pipe, automotive drive shafts, bicycle rack and construction using steel scaffolding

In addition, with seamless manufacturing annular parts, can improve material utilization, simplify the manufacturing process, saving material and machining time, such as bearing rings, jack sets, has been widely used to manufacture steel. Steel or a variety of conventional weapons indispensable material, barrel, barrel, etc. to make steel. Steel shapes in different cross-sectional area can be divided into tube and shaped tubes. Since in circumference equal conditions, the largest area of ​​a circle with a circular tube can carry more fluid. Magnetic particle testing or penetrant testing of seamless steel tubes can be effectively found surface cracks, folding, heavy leather surface defects, hairline, pinholes. For ferromagnetic materials, magnetic particle testing method should be given priority, because of its high detection sensitivity; For non-ferromagnetic material, such as stainless steel seamless pipe, then using penetration testing method.

When both ends of the cut is less reserve margin, due to structural reasons, the detection device may not be effective at both ends of the detection head, and the tip is the most likely site of the presence of cracks or other defects. If the end of the cracks tend to have potential, weld heat affected during installation is also possible to make a potential crack. Therefore, it should be noted that after the detection of certain seamless steel butt area, to detect defects in the expansion pipe ends.