Weld quality directly determines the quality of the pipe, that is to say, it is welded and seamless biggest difference lies. Longitudinal high-frequency welding or submerged arc welding, the carbon can not be eliminated straight sets crevices, welds, and the mother just converge together, and no one fully integrated, stand the test of time and pressure. Tension Reducing heat welded steel pipe in the pipe even after high temperature of about 800 degrees after heating, the overall annealing, after this series of processes, the weld performance close to the parent organization, well done seamlessly from seam to transition.
Different process also caused the differences in product quality, tension reducing steel pipe in steel pipe also conducted a straight seam welded pipe after welding are not do process: online clearing outside burr. The presence of burrs impact tube fluid - flow, burrs blocking the normal flow of fluid, to produce swirl. According to principles of fluid mechanics, the weld must increase local compression, discontinuity of the pipe safety factor is also greatly reduced, reducing the tension in the steel production process fully considered the risks that exist glitch for burr removal, making it uniform thickness, no difference in appearance with the seamless tube. So from this point of view, hot stretch reducing pipe joints from having also completed a seamless transition, of course, not limited to the difference between the above two points, but illustrates the Longitudinal and stretch reducing pipe also there are significant differences. Longitudinal latter carried out on the basis of clear internal and external burrs online, the overall heating type variable and a series of new processing technology, so that it has been a qualitative leap in the field of the widespread use of high-pressure, Longitudinal generally used in low voltage environment for water gas transmission or steel.
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