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Indian Journal of Engineering and Materials Sciences (IJEMS) >
IJEMS Vol.16 [2009] >
IJEMS Vol.16(5) [October 2009] >
| Title: | Methodology to evaluate the quality of diffusion bonded joints by ultrasonic method |
| Authors: | Kumar, S Suresh
Krishnamoorthi, J
Ravisankar, B
Angelo, P C |
| Keywords: | Diffusion bonding
Ultrasonic
Ti-6Al-4V
Strength ratio |
| Issue Date: | Oct-2009 |
| Publisher: | CSIR |
| Abstract: | The quality and
the soundness of diffusion bonded joints are generally evaluated by
metallographic techniques, shear strength/tensile strength etc. Since these
conventional methods are of destructive in nature, inspection on actual
products is difficult. Therefore, non-destructive testing of diffusion bonded
joints is required to evaluate the quality and to study the interphase
properties. The ultrasonic A-scan method is suitable for diffusion bonded
joints, since the sensitivity is
0.01-0.0001% as compared to the X-ray and Gamma ray methods having sensitivity
of 0.5-2% only. In the present work,
Ti-6Al-4V was bonded with Ti-6Al-4V at 1073 K at varying pressures of 1.6-4 MPa
for a bonding time of 4 h so as to obtain bonds with interfaces of varying
bonded area fraction. The shear strength of the bond is correlated with bonded
area fraction which is measured using metallographic technique. The bonded
samples are tested using ultrasonic flaw detector for the soundness of the
joints. The ratio between the amplitude of interface wall echo to amplitude of
surface echo is calculated and correlated with the bonded area fraction. |
| Page(s): | 331-334 |
| ISSN: | 0975-1017 (Online); 0971-4588 (Print) |
| Source: | IJEMS Vol.16(5) [October 2009]
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