A comparison between single sided friction stir welded and submerged arc welded DH36 steel thin plate

Norman McPherson, Alexander Galloway, James Wood, Stephen R. Cater

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Abstract

The adoption of the friction stir welding (FSW) process into the shipbuilding industry is being considered as a medium term issue. Currently the data on friction stir welded mild steels tends to be fragmented, with critical areas being short on specific data e.g. toughness. The work described has been put in place to directly compare friction stir welded and submerged arc welded thin plate. The plate thicknesses used were 4, 6 and 8mm thick DH36 grade
steel, which are commonly used in the construction of vessels such and destroyers, frigates corvettes and offshore patrol vessels. Friction stir welding was carried out using the currently best established parameters for a single sided process and this was compared against Submerged Arc Welding (SAW) over the same thickness range. Distortion was found to be lower in friction stir welded steel, but the 4mm thick was still showing significant distortion. No
issues were identified with weld metal strength, and toughness at -20OC was found to be comparable but more uniform across the weld area than with the submerged arc welded material. Microstructural observations have been linked to hardness, toughness and fatigue test data. The fatigue data includes the
observation of preferential crack initiation relative to the trailing/leading side of the welding process. An assessment on the feasibility of the process in a
shipbuilding environment will be included based on the data presented.
Original languageEnglish
Number of pages6
Publication statusPublished - 4 Jun 2012
Event9th International Conference on Trends in Welding Research - Chicago, United States
Duration: 4 Jun 20128 Jun 2012

Conference

Conference9th International Conference on Trends in Welding Research
CountryUnited States
CityChicago
Period4/06/128/06/12

Keywords

  • friction stir welding (FSW)
  • toughness
  • fatigue
  • distortion

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  • Cite this

    McPherson, N., Galloway, A., Wood, J., & Cater, S. R. (2012). A comparison between single sided friction stir welded and submerged arc welded DH36 steel thin plate. Paper presented at 9th International Conference on Trends in Welding Research, Chicago, United States.