GB/T 6519-2024 - Ultrasonic inspection method for deformed aluminum and magnesium alloy products

Standard No.: GB/T 6519-2024
Language: Chinese, Available in English version
Release Date: 2024
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China CN / GB
Latest: GB/T 6519-2024
Replace: GB/T 6519-2013

Introduction

Core changes in the standard revision

Revision items	2013 edition	2024 edition	Technical impact
Inspection environment requirements	Temperature range not specified	Constant temperature of 22℃±15℃	Improve the stability of test results
Dynamic test reference sample	Not required	New normative Appendix C	Strengthen the verification of automatic inspection system
Dense defect assessment	Only specify spacing requirements	Add quantitative indicators of distribution density	Improve the quality judgment system

The standard puts forward clear performance indicators for ultrasonic testers and probes:

Probe frequency range: 2~15MHz, high frequency improves resolution (≤5.08mm), low frequency enhances penetration
Instrument linearity: vertical linearity error ≤±5% (upper limit ≥95%, lower limit ≤10%)
Dynamic test requirements: Multi-channel systems require effective sound beam tests on all probes

Calculation formula: water distance h > T×(V₁/V₂), where:

T=sample thickness, V₁=speed of sound in water (1480m/s)
Wave control ≤±6mm, the secondary interface reflection wave needs to appear after the bottom wave

A Φ1.0mm defect was found in an AA grade aluminum alloy plate:

A Φ1.2mm flat bottom hole comparison test block with similar burial depth was selected
Adjust the gain so that the comparison test block amplitude reaches 80% of the full scale
The measured defect amplitude is 62%, which is qualified according to Table 7

Grade	Single defect	Dense defects	Bottom wave loss
AAA grade	≤Φ0.8mm	Not applicable	≤50%
Grade A	≤Φ2.0mm	7 pieces/500mm	≤50%

Staff training: GB/T 9445 certification is required, and special training for dynamic testing is added
Equipment upgrade: 15MHz high-frequency probe configuration, equipped with a regulated power supply (fluctuation ≤±2.5%)
File management: Establish test block ultrasonic response curve archive, storage period ≥5 years

GB/T 12604.1 Non-destructive testing—Terminology—Ultrasonic testing
GB/T 18694 Non-destructivetesting--Ultrasonic inspection--Characterization of search unit and sound field
GB/T 18852 Non-destructive testing—Ultrasonic testing—Reference blocks and test procedures for the characterization of contact probe sound beams
GB/T 19799.1 Non-destructive testing.Ultrasonic testing.Specification for calibration block No. 1
GB/T 28880 Non-destructive testing.Evaluating performance characteristics of ultrasonic pulse-echo testing systems without the use of electronic measurement instruments
JJG 746 Ultrasonic Flaw Detectors*， 2024-06-14 Update
YS/T 1187 Ultrasonic testing method for aluminum and aluminum alloy thin-walled pipes
YS/T 1188 Ultrasonic Testing Method for Cast Ingots of Deformable Aluminum Alloys*， 2025-08-19 Update
YS/T 1633 Ultrasonic phased-array inspection method of wrought aluminium and aluminium alloy products
YS/T 874 Ultrasonic inspection of wrought aluminium alloy columniform ingots by the water immersion method

2024 GB/T 6519-2024 Ultrasonic inspection method for deformed aluminum and magnesium alloy products
2013 GB/T 6519-2013 Ultrasonic inspection of wrought aluminium and magnesium alloy products
2000 GB/T 6519-2000 Process for ultrasonic inspection of wrought aluminum alloy products