STUDY OF FLAME HEATING OF STEEL PLATE

The effects of welding and analytical procedures for predicting welding effects are discussed. The results of previous investigations of flame heating are analyzed. A flat plate was chosen as a model for this investigation so that the analytical techniques, developed for welding, could be applied to the flame heating. Line flame heating is employed because this closely resembles bead-on-plate welding. Three steels; AISI 1020, ASTM A-242, and ASTM A-514 were chosen as materials. Heating was performed with and without water cooling and continuous readings of strain and temperature were taken at selected positions. The results of testing are presented in the form of temperature and strain plotted against time. Plots of experimental and analytical temperatures and strain are presented for comparison. It was found that flame heating with water cooling is more effective than without cooling, and the direction of the bending is controlled by the cooling. When water cooling is not employed, the flame heating is most effective on the mild steel. However, the direction of bending depends on the initial plate condition and is not controlled by the heating. Comparison of the analytical predictions of temperatures and longitudinal strains with experimental data shows good correlation. However, transverse strains are large for the flame heating so a one dimensional analysis, assuming transverse stresses are negligible, is not satisfactory for flame heating. Welding programs, as they are developed, can be modified for flame heating. A full three dimensional analysis is needed to optimize flame heating. It is recommended that further investigation of flame heating be delayed until a three dimensional analysis is developed. There is enough information available now on flame heating to make applications of this bending or straightening process more effective.

• Corporate Authors:

  Massachusetts Institute of Technology

  Department of Ocean Engineering, 77 Massachusetts Avenue
  Cambridge, MA  United States  02139
• Authors:
  • Johnson, E K
• Publication Date: 1971-5

Subject/Index Terms

• TRT Terms: Bending; Metal heating; Structural analysis
• Uncontrolled Terms: Heat treatment
• Old TRIS Terms: Flame bending; Flame straightening
• Subject Areas: Construction; Marine Transportation;

Filing Info

• Accession Number: 00034682
• Record Type: Publication
• Source Agency: Massachusetts Institute of Technology
• Files: TRIS
• Created Date: Sep 29 1972 12:00AM