[The effects of different welding wires on the mechanical properties of laser welding joints].
Shanghai Kou Qiang Yi Xue
; 15(4): 427-30, 2006 Aug.
Article
em Zh
| MEDLINE
| ID: mdl-16955174
ABSTRACT
PURPOSE:
To evaluate the mechanical properties and microstructure of laser-welded joints with different welding wires for clinical use of welding wire.METHODS:
The standard tensile test and three-point bending test rods were made from Co-Cr and Ni-Cr alloy, and were laser-welded with different welding wire (commercially welding wire and casting wire). Then the tensile rods were tested for the ultimate tensile strength (UTS), and the bending rods for the ultimate bending strength (UBS). The results was analyzed by one-way ANOVA. The tensile fracture surface were examined by scanning electron microscopy (SEM). Metallurgical analysis were also performed on polished longitudinal sectioned samples.RESULTS:
For Co-Cr alloy, the UTS of casting wire group and commercially welding wire group was respectively (606.40+/-82.53)MPa and (693.61+/-47.68)MPa; the UBS was respectively (997.95+/-88.89)MPa and (1160.76+/-91.59)MPa. ANOVA showed a significant difference of UTS and UBS between the two groups at the 0.05 level (P<0.05). For Ni-Cr alloy, the UTS of casting wire group and commercially welding wire group was respectively (558.14+/-46.75)MPa and (582.32+/-35.43)MPa; the UBS was respectively (1084.75+/-46.02)MPa and (1078.29+/-36.25)MPa. There was no significant difference between the two groups (P>0.05). SEM and metallurgical examination showed the welded zone exhibiting more cracks in the casting wire group than in the commercially welding wire group.CONCLUSION:
It would be advisable to work with commercially welding wire for the joints that need better strength.
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Base de dados:
MEDLINE
Assunto principal:
Soldagem em Odontologia
/
Soldagem
/
Teste de Materiais
/
Ligas Dentárias
/
Lasers
Limite:
Humans
Idioma:
Zh
Revista:
Shanghai Kou Qiang Yi Xue
Assunto da revista:
ODONTOLOGIA
Ano de publicação:
2006
Tipo de documento:
Article
País de afiliação:
China