title: Mechanical strength of laser-welded cobalt-chromium alloy.
abstract: The purpose of this study was to investigate the effect of the output energy of laser welding and welding methods on the joint strength of cobalt-chromium (Co-Cr) alloy. Two types of cast Co-Cr plates were prepared, and transverse sections were made at the center of the plate. The cut surfaces were butted against one another, and the joints welded with a laser-welding machine at several levels of output energy with the use of two methods. The fracture force required to break specimens was determined by means of tensile testing. For the 0.5-mm-thick specimens, the force required to break the 0.5-mm laser-welded specimens at currents of 270 and 300 A was not statistically different (p > 0.05) from the results for the nonwelded control specimens. The force required to break the 1.0-mm specimens double-welded at a current of 270 A was the highest value among the 1.0-mm laser-welded specimens. The results suggested that laser welding under the appropriate conditions improved the joint strength of cobalt- chromium alloy.
authors.affiliation: Department of Developmental and Reconstructive Medicine, Division of Fixed Prosthodontics and Oral Rehabilitation, Course of Medical and Dental Sciences, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Baba
authors.forename: I
authors.initials: I
authors.lastname: Watanabe
authors.forename: J
authors.initials: J
authors.lastname: Liu
authors.forename: M
authors.initials: M
authors.lastname: Atsuta
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry; D002858:Chromium Alloys / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry*; D017266:Dental Prosthesis; D007834:Lasers; D008422:Materials Testing; D013314:Stress, Mechanical; D013499:Surface Properties; D013718:Tensile Strength; D014896:Welding
chemical_list: D001672:Biocompatible Materials; D002858:Chromium Alloys; D003035:Cobalt