GJB 2908A-2020 in English

VALID

Edldy current testing

Issued on:2021-01-16
Implemented on:2021-03-01
File Format:PDF
Delivery:Via email within 5 business days

Price(USD)： $430.00
$418.00

Standard No:	GJB 2908A-2020
Document status:	VALID
Title in English:	Edldy current testing
Title in Chinese:	涡流检测方法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 5 business days
Issued on:	2021-01-16
Implemented on:	2021-03-01
Professional Classification:	GJB-Military
Related Keywords:	current test method requirements current test method eddy detection frequency current testermust φ0.4-0.6mm φ0.6-0.9mm detection frequency selection
Related Topics:	About Vortex streaming detection cd Aluminum rod eddy current testing standard flow detection gfp vortex flow detection gfp eddy current en flow detection gfp gfp flow detection mobile phase detection Anti-t3 detection method flow detection board Metal flow line detection method flow detection limit Streaming GFP detection Metal flow line detection method gfp streaming detection Method water flow detection Sequencing detection method sio2 detection method oxidation vortex method Forging flow line detection method gfp flow detection Eddy current testing Eddy current testing co2 detection method Near-field eddy current testing technology test method Wozhou Eddy Current Material Tester flow staining assay Airflow detection method Airflow detection method flow detection gfp Eddy Current Testing Method single stream detection eddy mobile phase detection iron flow detection gfp flow detection method Water flow detection method Eddy current method flow detection f detection method Silver detection method Eddy current testing instrument Vortex AC current detection gjb 2908 flow test positive cv detection method Eddy current resistance Streamline detection process streaming testing fee Silver detection method Three-stage vortex Basic method of flow detection Detection mobile phase gjb2908 streaming detection dapi streaming detectable method Flow cytometry detection astm eddy current Oxygen flow detection method sp method detection sdi detection method Detection methods of autophagy flow Ground detection method Autophagy flow detection method Flow cytometry reagent detection method Detection method benchmarking Advantages and Disadvantages of Eddy Current Testing Methods for Coatings Validation of flow cytometry phenotypic detection methodology Blade eddy current detection method Methods to detect autophagic flux Autophagy flow unobstructed detection method Atmospheric flow velocity detection method Shrapnel overcurrent detection method Tubular eddy current oil remover inspection Flow cytometry method validation Autophagy flow detection method Carbon flow detection method Mainstream methylation detection methods Eddy current solder joint inspection system Arsenic detection methods and procedures Flow rate detection method gjb2908a gjb 9883 2020 Flow cytometry sample storage method Eddy current testing related gjb 2908-2020 gjb2908-2020

Introduction

Core changes in the standard revision

Revision items	GJB 2908-1997	GJB 2908A-2020
Standard name	Eddy current test method	Eddy current test method
Requirements for testers	Basic qualification regulations	Detailed and graded operation authority
Instrument performance	Frequency accuracy is not specified	Frequency deviation is required to be ≤±5%

Key technical requirements of the detection system

Eddy current tester

Must meet the following requirements:

Dual-frequency, dual-channel or above
Frequency range 10kHz-6MHz
Gain range>40dB

Detection coil

Classification:

Placement type (surface detection)
Through type (pipe detection)
Special type (array/rotating probe)

Comparison sample grading system

Sample type	Grade A requirements	Grade B requirements
Component notching	0.12×0.2×5mm	0.2×0.4×10mm
Pipe through hole (φ≤16mm)	φ0.4-0.6mm	φ0.6-0.9mm

Detection frequency selection principle

Standard penetration depth δ calculation formula:

δ=503√(ρ/μf)

ρ is the resistivity (Ω·m), μ is the magnetic permeability (H/m), and f is the frequency (Hz)

Implementation suggestions

Aeroengine blade detection case

Use Placeable probe with 2MHz detection frequency, use A-grade grooved specimen to adjust sensitivity, surface treatment is required when the covering layer exceeds 0.1mm.

More samples: QC/T 942-2021 DL/T 5154-2012 JJG 21-2008

Sample only — not a preview of GJB 2908A-2020

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