title: Effects of argon gas flow rate on laser-welding.
abstract: The purpose of this study was to evaluate the effects of the rate of argon gas flow on joint strength in the laser-welding of cast metal plates and to measure the porosity. Two cast plates (Ti and Co-Cr alloy) of the same metal were abutted and welded together. The rates of argon gas flow were 0, 5 and 10 L/min for the Co-Cr alloy, and 5 and 10 L/min for the Ti. There was a significant difference in the ratio of porosity according to the rate of argon gas flow in the welded area. Argon shielding had no significant effect on the tensile strength of Co-Cr alloy. The 5 L/min specimens showed greater tensile strength than the 10 L/min specimens for Ti. Laser welding of the Co-Cr alloy was influenced very little by argon shielding. When the rate of argon gas flow was high, joint strength decreased for Ti.
authors.affiliation: Department of Removable Prosthodontics, Tsurumi University School of Dental Medicine, Yokohama 230-8501, Japan. takayama-y@tsurumi-u.ac.jp
authors.forename: Yasuko
authors.initials: Y
authors.lastname: Takayama
authors.forename: Rie
authors.initials: R
authors.lastname: Nomoto
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Nakajima
authors.forename: Chikahiro
authors.initials: C
authors.lastname: Ohkubo
mesh_terms: D001128:Argon / Q000737:chemistry; D002858:Chromium Alloys; D003035:Cobalt; D003722:Dental Alloys; D003735:Dental Casting Technique; D003799:Dental Stress Analysis; D006244:Hardness; D021621:Imaging, Three-Dimensional; D053844:Lasers, Solid-State; D016062:Porosity; D012212:Rheology; D013718:Tensile Strength; D014025:Titanium; D014896:Welding / Q000295:instrumentation / Q000379:methods*; D055114:X-Ray Microtomography
chemical_list: D002858:Chromium Alloys; D003722:Dental Alloys; D003035:Cobalt; D001128:Argon; D014025:Titanium