Optimization of Multi-Wire GMAW Welding Procedure for Heavy-Wall Offshore Pipeline Construction
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Optimization of Multi-Wire GMAW Welding Procedure for Heavy-Wall Offshore Pipeline Construction

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      Final Project Report
    • Abstract:
      The U.S. Department of Transportation, Pipeline and Hazardous Materials Safety Administration (DOT/PHMSA), in a communication with the Center for Reliable Energy Systems (CRES) on July 27th of 2011, decided to terminate the project. Besides the project management activities, only part of the technical activities of Task 2 was performed. This final report briefly describes the activities and the related results. Task 2 involved model development and calibration. In order to predict the thermal cycles and microstructures of X70/X80 girth welds, including the weld metal and the heat-affected zone (HAZ) made with GMAW and its multi-wire variants, the fundamental responses of both weld metal and HAZ to welding thermal cycles are needed. For this reason, the past research works on HAZ and weld metal microstructure and mechanical properties were reviewed. Data for X70 and X80 pipe steels and their girth welds were collected. As presented in the PHMSA-sponsored X100 welding project reports, the integrated model was able to predict the thermal cycles and hardness profiles within a pipeline girth weld. The microstructure model was originally developed toward its application to X100 girth welds. Calibrating the microstructure model against the X70 and X80 data would expand the model’s range of application to X70 and X80 girth welds. In summary, it was found that there are enough X70/X80 HAZ data that are readily available for model calibration after the review of public literature. For weld metal, however, the data are still limited and additional experiments may be needed before the model can be calibrated.
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