Repair welding procedure development

TWI staff can advise on the choice of materials, and can discuss the choice of welding process, weld preparation and all aspects of welding procedure. A range of weldability tests can be carried out, if required. Site visits and audits of welding practice can be arranged.

TWI has experience in controlled deposition repair procedures for C-Mn and low alloy steels aimed at achieving a substantial amount of HAZ refinement and tempering. Early work involved the development of a two-layer deposition procedure for C-Mn steels [1] . The work was extended to low alloy steels in a series of group-sponsored projects. Some of the work remains confidential to the members of the sponsor-group, but some articles have been published [2,3] . TWI can advise on repair without post-weld heat treatment, and assist in developing welding procedures, and in training welders to carry out controlled deposition repair procedures.

More recent publications, relating to low alloy steels, have been more general in their scope [4,5] . Other recent work, carried out on the Core Research Programme [6] , relates to the welding of modified 9%Cr steel, which is finding increasing application within the power generation industry both for plant upgrade and new build.

Relevant publications:

  1. Jones R L, 'Development of two-layer deposition techniques for the manual metal arc repair welding of thick C-Mn steel plate without post-weld heat treatment', The Welding Institute Research Report 335/1987, April 1987.

  2. Bailey N, 'Prospects for repair of thick sectioned ferritic steel without post-weld heat treatment', Proceedings of the 5 th International Symposium of the Japan Welding Society on Advanced technology in welding materials processing and evaluation, The Japan Welding Society, Tokyo, 17-19 April 1990.

  3. Friedman L M, 'EWI/TWI controlled deposition repair welding procedure for 1.25%Cr-0.5%Mo and 2.25%Cr-1%Mo steels', Welding Research Council Bulletin, 4-2 June 1996 27-34.

  4. Brett S J, Abson D J and Jones R L, 'The repair welding of power plant without post-weld heat treatment', Proc. Int. Conf. on Integrity of High Temperature Welds, Nottingham, 3-4 November 1998, Institution of Mechanical Engineers/Institute of Materials, 53-63.

  5. Barnes A M, Jones R L, Abson D J and Gooch T G, 'Welding and fabrication of high temperature components for advanced power plant', Proc. Materials Congress '98, Frontiers in Materials Science and Technology, 1998, Cirencester, 6-8 April 1998 Institute of Materials 1998.

  6. Barnes A M, 'Solidification cracking susceptibility of modified 9Cr1Mo submerged arc weld metals: the influence of Mn & Nb', Proc. Parsons 2000, 5 th Int. Charles Parsons Conference on Advanced Materials for 21 st Century Turbines and Power plant, Cambridge 3-7 July 2000, Eds. A Strang and W M Banks, Institute of Materials, 2000, 407-430.

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