Oblique Y-groove cracking test of the welding cold cracking susceptibility of domestic X-70 pipeline steel

摘要

Gas Transmitting From West to East Project" is significant. It should ensure the welding quality and safety of pipeline. The task is very arduous to guarantee the quality of the project in the condition of long line, complex weather and geology features. In this paper, the welding cold cracking susceptibility of domestic X-70 pipeline steel adopted by the project, which is one of the most interesting questions of welding quality about petrol pipeline, was studied by means of oblique Y-groove cracking test. The crack ratio of surface and section was tested under the conditions of different welding materials and preheat temperature. The thickness of plate steel was 14. 7 mm and 10. 3 mm. The results reveal that X-70 pipeline steel has good crack resistance. The research has important value for the construction of large-scale pipeline engineering and the application of domestic X-70 pipeline steel.