Location

Snowmass Village, CO

Start Date

1-1-1995 12:00 AM

Description

Shot-peening metal products is a very common manufacturing practice for various reasons. Shot-peening provides fatigue crack resistance, friction, lubrication, wear and surface finishing. Shot-peened surfaces are also found on many areas on gas turbine engine disks. The rough surfaces caused by the shot-peening process often makes the eddy current inspection of engine disks difficult. This is because the signals from rough surfaces often give strong background readings. In addition to this noisy background due to shot-peened surfaces, the background signals due to the titanium grain structure also makes the inspection complicated. Ko, Xu and Birx [1] used several innovative signal processing techniques to enhance the defect detection in Ti-6A1-4V material, but these techniques are not adequate when the titanium material is heavily shot-peened. De La Pintiere [2] used a multiparameter technique to examine the OD defect of a heat exchanger tube in the presence of ID pilgering noise. The research of the defect inspection on shot-peened surfaces, however, seems sporadic. The purpose of this study is to examine the effect of shot-peened surfaces on eddy current signals at different inspection frequencies and its effect on a titanium engine disk inspection in an automated test environment.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

14A

Chapter

Chapter 3: Interpretive Signal Processing and Image Analysis

Section

Signal Processing

Pages

755-761

DOI

10.1007/978-1-4615-1987-4_94

Language

en

File Format

application/pdf

Share

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Jan 1st, 12:00 AM

Automated Eddy Current Detection of Flaws in Shot-Peened Titanium Materials

Snowmass Village, CO

Shot-peening metal products is a very common manufacturing practice for various reasons. Shot-peening provides fatigue crack resistance, friction, lubrication, wear and surface finishing. Shot-peened surfaces are also found on many areas on gas turbine engine disks. The rough surfaces caused by the shot-peening process often makes the eddy current inspection of engine disks difficult. This is because the signals from rough surfaces often give strong background readings. In addition to this noisy background due to shot-peened surfaces, the background signals due to the titanium grain structure also makes the inspection complicated. Ko, Xu and Birx [1] used several innovative signal processing techniques to enhance the defect detection in Ti-6A1-4V material, but these techniques are not adequate when the titanium material is heavily shot-peened. De La Pintiere [2] used a multiparameter technique to examine the OD defect of a heat exchanger tube in the presence of ID pilgering noise. The research of the defect inspection on shot-peened surfaces, however, seems sporadic. The purpose of this study is to examine the effect of shot-peened surfaces on eddy current signals at different inspection frequencies and its effect on a titanium engine disk inspection in an automated test environment.