title: [Comparative study of technique of laser welding ceramo-alloy by different gap distance].
abstract: OBJECTIVE
  To investigate the quality of laser welded non-precious base alloy by different gap distance and its clinic probability.
  
  
  METHODS
  Laser welded ceramo-alloy CW-PA specimens by different gap distance of 0.0 mm, 0.25 mm, 0.5 mm, Tested joined sample's UTS, microhardness; took SEM examination on its tensile fracture surface and metallographic examination on longitudinal cross section.
  
  
  RESULTS
  The study showed that UTS of Laser welded CW-PA by different gap distance of 0.0 mm, 0.25 mm, 0.5 mm is (446.05 +/- 82.50) MPa, (485.97 +/- 62.35) Mpa, (503.32 +/- 65.79) MPa respectively, approach to original rod (421.53 +/- 21.78) MPa (P > 0.05). Microimage at tested samples of gap distance at 0.0 mm, 0.25 mm are good.
  
  
  CONCLUSIONS
  It revealed that 1. Laser welding specimen should be contacted as close as possible 2. The gap distance should be less than 0.5 mm, 0.25 mm is better, and easy to handle.
authors.affiliation: Department of Prosthodontics, College of Stomatology, West China University of Medical Science, Chengdu 610041, China.
authors.forename: H
authors.initials: H
authors.lastname: Li
authors.forename: Y
authors.initials: Y
authors.lastname: Zhao
authors.forename: M
authors.initials: M
authors.lastname: Li
mesh_terms: D012994:Dental Soldering / Q000379:methods*; D007834:Lasers; D008422:Materials Testing / Q000379:methods; D016876:Metal Ceramic Alloys
chemical_list: D016876:Metal Ceramic Alloys