One-side manual welding of root-runs, against ceramic backing and using "hot-start" devices, allows the use of relatively high currents close to the maximum capacity of the electrode because it prevents burning-through and shapes the root-side underbead smoothly. De-gassing of the weld metal is therefore easily finished before the metal solidifies. The ceramic backing and the use of the over-current (a pulse of about 100A above the chosen welding-current) when restriking make it possible to burn through a remelt defects such as pipe and cracks. The operator controls the over-current by means of a switch on the electrode holder. A case study is presented in which one-side welding, for 20-mm plate welded on site in the horizontal position, is shown to result in a saving of about 20 to 35% in operating time and costs as compared with a traditional method; this result is discussed. Some recommendations are included on the choice of equipment for hot-start welding.

  • Supplemental Notes:
    • This article first appeared in the ESAB publication "Svetsaran."
  • Corporate Authors:

    IPC Science and Technology Press Limited

    IPC House, 32 High Street
    Guildford, Surrey  England 
  • Publication Date: 1977

Media Info

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Filing Info

  • Accession Number: 00158013
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Aug 31 1977 12:00AM