INVESTIGATION OF WELDING THERMAL STRAINS IN MARINE STEELS

The stress-strain-temperature response of metal plates during welding is discussed and current efforts to analyze the phenomena are outlined. Transient strain and temperature data obtained from welding experiments on HY-80, HY-130, low carbon and maraging steels are presented. The experiments were designed to approximate ship structural weldments including thick-section, multi-pass butt welds. The experimental data are compared to analytical predictions obtained from computer programs developed for the National Aeronautics and Space Administration. Results indicate that the programs can be used to analyze complex structural weldments applicable to ship and submarine fabrication. It was also found that the effects of thick-section, multi-pass welding are more pronounced in the early passes and tend to level off as deposited weld metal increases. The transient strain response of both thin and thick section plates was found to be predominantly longitudinal except in the immediate area of the welding arc itself. The maximum mechanical strains observed on plates of varying strength levels were found to be roughly proportional to the inverse of the base plate yield strength. Finally, the strain plots of the two highest strength steels were characterized by unusual secondary tensile peaks which may be linked to phase transformations in the heat affected zone during cool-down. Several recommendations are made concerning further investigations aimed at developing the NASA programs and subsequent experiments into shipyard design and production tools.

  • Corporate Authors:

    Massachusetts Institute of Technology

    Department of Ocean Engineering, 77 Massachusetts Avenue
    Cambridge, MA  USA  02139
  • Authors:
    • Klein Jr, K M
  • Publication Date: 1971-5

Subject/Index Terms

Filing Info

  • Accession Number: 00034677
  • Record Type: Publication
  • Source Agency: Massachusetts Institute of Technology
  • Files: TRIS
  • Created Date: Sep 29 1972 12:00AM