Mechanical strength and analysis of fracture of titanium joining submitted to laser and tig welding
AUTOR(ES)
Piveta, Ana Cláudia Gabrielli, Montandon, Andréia Affonso Barreto, Ricci, Weber Adad, Nagle, Maurício Meirelles
FONTE
Mat. Res.
DATA DE PUBLICAÇÃO
09/10/2012
RESUMO
This study compared the tensile strength and fracture mechanism of tungsten inert gas (TIG) welds in cylindrical rods of commercially pure titanium (cp Ti) with those of laser welds and intact samples. Thirty dumbbell-shaped samples were developed by using brass rods as patterns. The samples were invested in casings, subjected to thermal cycles, and positioned in a plasma arc welding machine under argon atmosphere and vacuum, and titanium was injected under vacuum/pressure. The samples were X-rayed to detect possible welding flaws and randomly assigned to three groups to test the tensile strength and the fracture mechanism: intact, laser welding, and TIG welding. The tensile test results were investigated using ANOVA, which indicated that the samples were statistically similar. The fracture analysis showed that the cpTi samples subjected to laser welding exhibited brittle fracture and those subjected to TIG welding exhibited mixed brittle/ductile fracture with a predominance of ductile fracture with the presence of microcavities and cleavage areas. Intact samples presented the characteristic straightening in the fracture areas, indicating the ductility of the material.
Documentos Relacionados
- Flexural strength of pure Ti, Ni-Cr and Co-Cr alloys submitted to Nd:YAG laser or TIG welding
- Effect of laser welding on the titanium composite tensile bond strength
- Effect of laser welding on the titanium ceramic tensile bond strength
- Tensile and Flexural Strength of Commercially Pure Titanium Submitted to Laser and Tungsten Inert Gas Welds
- Laser beam welding tempered 300M ultrahigh mechanical strength steel