Laser Welding of Titanium and Dental Precious Alloys

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  • Iwasaki Keiji
    Dental Materials and Engineering, Department of Oral Health Science, Graduate School of Dental Medicine, Hokkaido University
  • Ohkawa Shoji
    Dental Materials and Engineering, Department of Oral Health Science, Graduate School of Dental Medicine, Hokkaido University
  • Uo Motohiro
    Dental Materials and Engineering, Department of Oral Health Science, Graduate School of Dental Medicine, Hokkaido University
  • Akasaka Tsukasa
    Dental Materials and Engineering, Department of Oral Health Science, Graduate School of Dental Medicine, Hokkaido University
  • Watari Fumio
    Dental Materials and Engineering, Department of Oral Health Science, Graduate School of Dental Medicine, Hokkaido University

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  • Laser welding of titanium and dental preciouss alloys

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Abstract

The performance of laser welding of Ti and two dental precious alloys (Ag-Pd-Au, Au-Pt-Ag) was investigated by mechanical testing and microscopic observation, using butt joint as design. The laser irradiation was done using a commercial Nd:YAG dental laser-welding device in a single pulse mode with output currents 150, 200, 250, 300 A, spot diameters 0.6, 0.9, 1.2 mm, and pulse duration 10 ms. The average welding fracture strength of the dissimilar metals were 108.9 and 137.2 MPa for Ti and Ag-Pd-Au alloy, and Au-Pt-Ag alloy, respectively. The average welding fracture strength of the same metals were 594.9, 648.8 and 312.9 MPa for Ti, Ag-Pd-Au alloy and Au-Pt-Ag alloy. The hardness increased in weld zone, compared with the base metals. Penetration depths were affected by the welding conditions such as the output currents and spot diameters. The welding cracks and porosity were observed in microstructures of the welds. Mapping by EPMA showed the remarkable heterogeneity of the component metals concerned. The welding cracks, porosities and granular precipitates similar to metallic compounds in the weld zones were suggested as the cause for lower welding fracture strength in the dissimilar welds, compared with the similar metals.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 45 (4), 1140-1146, 2004

    The Japan Institute of Metals and Materials

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