Abstract: With the characteristics of the sandglassshaped temperature field generated during welding of highfrequency induction longitudinally welded pipe taken into consideration, this paper focuses on the rules of influence of a ...

Abstract: As oil and gas pipelines develop toward large throughput and high pressure, more and more attention has been paid to welding quality of oil pipelines. Submerged arc welding is widely applied in manufacturing of large-diameter ...

Abstract: In the piercing process of large-diameter seamless steel pipe blanks after heating, severe lateral cracks easily occur on the surface of pierced pipe blanks owing to the effects of the large temperature difference and ...