The quality of the advanced pipe is largely dependent on the development of nondestructive testing techniques. The use of non-destructive testing, on the one hand can check the defects of the pipe to ensure the reliability of the use of welded pipe; on the other hand can also test the results of the information feedback system, the pipe production process quality control. Therefore, the development of non-destructive testing is to improve the quality of welding pipe and the level of production of important technical measures.
In order to achieve the above objectives, countries attach great importance to the production of new welding pipe technology and new technology experimental research. Such as the United States recently developed a new wave of square wave welding technology to produce 7-76 mm diameter pipe. As the square wave welding does not have the effect of current peak, so the edge of the heating uniform, good weld quality. Production of thin-walled and thin-walled pipe roll forming technology, is now available for many countries.
Weld pipe and cold drawing and cold rolling to achieve continuous production, has also achieved good results. The United States is also in a set of 406 mm six-seam welded pipe unit, the configuration of the cold expansion machine to improve the strength of finished pipe (about 25%), while improving the pipe section shape and dimensional accuracy.
