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Failure Analysis for Welding of Primary Loop Pipes in High-Power Pump Test Platform

[+] Author Affiliations
Bo Yang, Yi-chang Huang, Yao-zhou Qian, Xiao-ying Tang

Shanghai Institute of Special Equipment Inspection and Technical Research, Shanghai, China

Paper No. PVP2016-63332, pp. V01BT01A027; 6 pages
  • ASME 2016 Pressure Vessels and Piping Conference
  • Volume 1B: Codes and Standards
  • Vancouver, British Columbia, Canada, July 17–21, 2016
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5036-7
  • Copyright © 2016 by ASME


Welding of 15NiCuMoNb5-6-4 and austenitic stainless steel thickness pipes is necessary in the primary loop pipes installation for the platform. In the process of formulating welding procedure specification of the pipeline pre-welding between 15NiCuMoNb5-6-4 and Z3CN20-09M, some macroscopical cracks appeared repeatedly on the surface of bend-test specimens, while other performances of welding joints such as mechanical properties at room temperature, high temperature tensile properties and impact properties could meet the relevant codes requirements. Focus on present problem, chemical composition analyses, metallographic microstructures analyses and scanning electron microscope observation were adopted to find the welding failure root cause. Finally, INCONEL®152M and 52M with 30% chromium were chosen to be the welding materials because of good ductility dip cracking resistance. It was found that the performance of the welding joints could satisfy the codes and engineering requirements.

Copyright © 2016 by ASME



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