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The Detection of Burn-Through Weld Defects Using Noncontact Ultrasonics.
Zeynab Abbasi1, Donald Yuhas2, Lu Zhang3
1Civil & Materials Engineering Department, University of Illinois at Chicago, Chicago 60607, IL, USA. zabbas5@uic.edu.
Materials (Basel, Switzerland)
|January 19, 2018
Summary
This study introduces noncontact, air-coupled ultrasonics for detecting weld burn-through defects. This method identifies degraded weld zones by analyzing ultrasonic wave properties, enhancing product reliability.
Area of Science:
- Materials Science
- Non-Destructive Testing
- Ultrasonic Testing
Background:
- Welding is integral to the metal industry, necessitating defect detection for product reliability.
- Nonintrusive process control is crucial for preventing welding defects like burn-through.
- Burn-through damage compromises weld integrity and product quality.
Purpose of the Study:
- To investigate the detection of burn-through damage in welded samples.
- To evaluate the efficacy of noncontact, air-coupled ultrasonics for in-situ inspection.
- To correlate ultrasonic findings with material microstructure.
Main Methods:
- Utilized noncontact, air-coupled ultrasonic testing for inspecting welded samples.
- Analyzed changes in ultrasonic wave velocity, energy ratio, and amplitude.
- Examined wave energy dispersion and attenuation characteristics.
- Employed weld sample micrographs for validation.
Main Results:
- Burn-through damage was detected by identifying lower ultrasonic wave velocity, energy ratio, and amplitude.
- Increased burn-through correlated with greater wave energy dispersion and higher attenuation.
- Ultrasonic results were validated against microscopic analysis of weld samples.
Conclusions:
- Air-coupled ultrasonic testing is a viable method for detecting weld burn-through.
- This nonintrusive technique allows for immediate, in-situ inspection of welds.
- The study confirms the relationship between burn-through severity and ultrasonic wave propagation characteristics.
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