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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2007

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GTA remelting of surface spot defects

Klimpel A., Luksa K., Kik T.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 25, nr 2

73-76

Purpose: A statistical model that explains the interaction between cross-section dimensions of a GTA remelted spot area and remelting parameters is presented. It will be utilized in the repair of an investment casting made of nickel-based superalloys. Design/methodology/approach: An experimental design of response surface was used to elaborate the model of GTA remelting. Results of experiments were verified experimentally. Findings: The dimensions and volume of a remelted area are a linear function of the GTA welding process parameters. It is possible to remelt small surface defects and keep a smooth surface. Research limitations/implications: Research results are limited to the tested range of parameters and base material properties. Changes in thermal conductivity can strongly influence the presented results. Crack sensitivity of material can restrict the range of parameters. Practical implications: Results of the research will help in the repair of surface spot defects of nickel-based superalloys. The proposed method of repair can help to minimize the number of rejected parts. Originality/value: A new approach to welding technology is presented. A statistical model of GTA remelting process could be a useful tool for the precise selection of process parameters.