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Non-destructive three-dimensional evaluation of pores at different welded joints and their effects on joints strength.
MedLine Citation:
PMID:  20828805     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
OBJECTIVES: The purpose of this study was to measure the porosity in different laser welded cast alloys non-destructively using X-ray micro-focus computerized tomography (micro-CT) and to evaluate the effect of porosity on the tensile strength of the welded joints.
MATERIALS AND METHODS: The welding procedure was conducted in rectangular cast metals, CoCr, Ti and platinum added gold alloy (AuPt). The metal plates were butted CoCr to CoCr (CoCr/CoCr) or Ti to Ti (Ti/Ti) for welding of similar metals and Ti to AuPt (Ti/AuPt) for welding of dissimilar metals. Specimens were welded under several laser-welding conditions; with groove (normal), without groove (no groove), spatter, crack, or no overlapped welding (no overlap) (n=5). Porosity in the welded area was evaluated using a micro-CT. Tensile strength of the welded specimens was measured at a crosshead speed of 1mm/min. Multiple comparisons of the group means were performed using ANOVA and Fisher's multiple comparisons test (α=.05). The relationship between the porosity and the tensile strength was investigated with a regression analysis.
RESULTS: Three-dimensional images of Ti/AuPt could not be obtained due to metal artifacts and the tensile specimens of Ti/AuPt were debonded prior to the tensile test. All other welded specimens had porosity in the welded area and the porosities ranged from 0.01% to 0.17%. The fractures of most of the CoCr/CoCr and Ti/Ti specimens occurred in the parent metals. Joint strength had no relationship with the porosity in the welded area (R(2)=0.148 for CoCr/CoCr, R(2)=0.088 for Ti/Ti, respectively).
SIGNIFICANCE: The small amount of porosity caused by the laser-welding procedures did not affect the joint strength. The joint strength of Ti/AuPt was too weak to be used clinically.
Authors:
Rie Nomoto; Yasuko Takayama; Fujio Tsuchida; Hiroyuki Nakajima
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Publication Detail:
Type:  Journal Article     Date:  2010-09-15
Journal Detail:
Title:  Dental materials : official publication of the Academy of Dental Materials     Volume:  26     ISSN:  1879-0097     ISO Abbreviation:  Dent Mater     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2010-11-01     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8508040     Medline TA:  Dent Mater     Country:  England    
Other Details:
Languages:  eng     Pagination:  e246-52     Citation Subset:  D    
Copyright Information:
Copyright © 2010 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
Affiliation:
Department of Dental Engineering, Tsurumi University School of Dental Medicine, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama 230-8501, Japan. nomoto-r@tsurumi-u.ac.jp
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