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Hook Crack In Electric Resistance Welding Line Pipe Steel, Sima Aminorroaya-Yamini, Hossein Edris, Mehrdad Fatahi
Hook Crack In Electric Resistance Welding Line Pipe Steel, Sima Aminorroaya-Yamini, Hossein Edris, Mehrdad Fatahi
Australian Institute for Innovative Materials - Papers
One of the production methods for API line pipe steel is electric resistance welding (ERW). This kind of pipes is encountered with hook crack which is one of the defects that is observed in the upset zone of ERW pipes, detecting by ultrasonic inspection. Hook crack is a small crack following the weld flow lines and if severe enough, opened up at the pipe surface. These defects were commonly associated with sulphide stringers and non metallic oxide inclusions.
In this research, welds containing hook cracks were obtained from Ahvaz pipe making factory. Scanning electron microscope (SEM) examination showed that all …