Optical Laboratory

1
Non-Destructive Evaluation of Spot Weld using
Digital Shearography
Dr. Lianxiang Yang,Associate Professor.Praveen R
Samala,Doctoral CandidateSheng Liu, Doctoral
CandidateOptical Laboratory,Oakland
University,Rochester,MI.(Emailyang2_at_oakland.edu
Ph(248)370-2283)

• What is Shearography?
• Shearography is an interferometric method and
  measures strain data directly.
• It is a full-field,non-contact optical measuring
  technique with a very high accuracy.
• It used for the Non-destructive evaluation of
  spot weld as shown below.

Principle of Measurement and Interpretation of
Measured Results
Interpretation of Measured Results
Principle of Measurement
Measured Results for Spot Welds
Spot Weld Coupon with Nugget Size same as
Indentation size
Spot Weld Coupon with Nugget Size different from
Indentation size
Spot Weld Coupon