抄録
The release of metal ions in vivo is often accompanied by allergic reaction. Therefore, it is desirable to use the same metal in the oral cavity because of electrochemistry. With this in mind, titanium, for example, is recommended as an implant as well as for a prosthesis. With laser welding, it is possible to join parts by the self-welding of the metal parts. However, laser welding induces volume reduction during the welding process. This study was conducted to investigate the relationship between titanium foil and volume reduction during the welding process. The results were as follows:
1. Laser-welded titanium plate produced porosity both on the surface and in the cross-section.
2. The insertion of a titanium foil was effective in preventing volume reduction during the welding process. In the experiment, no porosity was observed on the surface.
3. Greater bending strength was generally observed for self-welding titanium plate using 30 μm titanium foil. However, the bending strength decreased as the thickness of titanium foil was increased. Laser-welded titanium plate decreased in elasticity, with hardness of the welded area being greater than that the original area.
