Ultrasonic NDE for Friction-Welded Blisk Defect Detection
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Solution Overview
Problem
Conventional non-destructive evaluation (NDE) methods are inadequate for inspecting the complex geometry of friction welded bladed discs (blisks), failing to effectively detect material defects such as lack of bonding, cracks, or foreign inclusions due to limited accessibility.
Innovation Solution
The use of ultrasonic NDE methods, specifically employing electromagnetic acoustic transducers (EMATs), LASER Assisted Ultrasonic (LAUT) techniques, and phased array ultrasonics with non-linear ultrasonic drivers to scan and analyze the structural integrity of blisks, including identifying interfaces and grain size distribution, enabling comprehensive subsurface and bulk inspections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional NDE methods are used to inspect friction welded blisks, then the inspection process is simple and accessible, but the detection capability for material defects is inadequate due to complex geometry
Solution Approach 1:
The inspection process is divided into multiple sequential steps: initial visual inspection, followed by selective ultrasonic testing of identified regions, and finally detailed phased array examination of suspicious areas. This segmentation allows comprehensive defect detection while managing overall process complexity through staged assessment.
Solution Approach 2:
The patent transitions from surface-level visual inspection to subsurface ultrasonic examination, adding a depth dimension to the inspection. Ultrasonic waves penetrate into the material volume, enabling detection of internal defects that conventional surface methods cannot access in complex geometries.
2Reliability
If ultrasonic NDE methods are used to detect material defects in blisks, then structural integrity can be verified, but the inspection time and complexity increase
Solution Approach 1:
Visual inspection and surface examination are performed first to identify regions of interest before applying time-consuming ultrasonic testing. This preliminary screening reduces the total inspection time by focusing detailed ultrasonic examination only on areas suspected of containing defects.
Solution Approach 2:
The patent replaces manual visual inspection with automated ultrasonic testing systems that can quickly scan large areas. The substitution of mechanical/optical methods with acoustic field-based ultrasonic inspection improves efficiency and reliability while managing time constraints.
3Productivity
If friction welding is used to join blades to disc, then manufacturing efficiency is improved, but structural stiffness and bonding reliability may be insufficient
Solution Approach 1:
Ultrasonic inspection provides immediate feedback on the quality of friction weld joints, allowing real-time assessment of bonding strength and stiffness. This feedback mechanism enables verification of weld quality without waiting for operational failure, ensuring that productivity gains do not compromise structural integrity.
Solution Approach 2:
The patent replaces mechanical strength testing (which would require destructive sampling) with non-destructive ultrasonic testing. This substitution allows verification of joining strength and stiffness while maintaining production efficiency and avoiding damage to test specimens.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
These methods provide thorough inspections of friction-welded blisk regions, ensuring structural integrity by detecting defects and anomalies, improving the reliability of blisk manufacturing processes and reducing the need for costly repairs.
Implementation Method 1
electromagnetic acoustic transducers (EMATs)
Implementation Method 2
ultrasonic NDE methods
Implementation Method 3
LASER Assisted Ultrasonic (LAUT) techniques
Implementation Method 4
LASER Assisted Ultrasonic (LAUT) techniques
Implementation Method 5
phased array ultrasonics
Implementation Method 6
phased array ultrasonics
Data Source
Figure 1A~1C
Figure 2
Figure 3A~3B
AI summary
The disclosed embodiments generally relate to non-destructive evaluation methods. More particularly, the disclosed embodiments relate to ultrasonic non-destructive evaluation methods for the evaluation of friction welded bladed discs ("blisks"). In an embodiment, a method for non-destructive evaluation of a bladed disc structure includes identifying a region of interest on the bladed disc structure; positioning an ultrasonic transducer and receiver in the region of interest; scanning the region of interest using the ultrasonic transducer and receiver to produce a scan image; and comparing the scan image against a reference image to determine the presence of an anomaly in the region of interest.