SAE ARP1923B-2023
Qualification and Certification of Etch Inspectors
- Standard No.
- SAE ARP1923B-2023
- Release Date
- 2023
- Published By
- Society of Automotive Engineers (SAE) US / SAE
- Latest
- SAE ARP1923B-2023
- Introduction
Standard Evolution Background and Technical Framework
ARP1923B, the latest revision of the SAE international standard (validated in 2023), replaces ARP1923A, published in 1985. This standard uses a five-year review mechanism to ensure that technical requirements are synchronized with industry practices. It primarily regulates the qualification certification system for etching inspectors in aerospace component inspection.
Analysis of Core Certification Requirements
Assessment Type Key Indicators Pass Criteria Vision Test Ortho-Rater 8/J2 or Snellen 20/30 Near Vision (12-16 inches) Monocular Vision (Correctable) Written Exam 20+ Theoretical Questions (Cleaning Process/Operating Procedures/Testing Techniques) ≥80% Correction Rate Practical Assessment 3 typical sample inspections (10+ checkpoints) Accurately identify defects with a score of ≥80% Typical application case: For 4340 steel components, inspectors need to use a dual solution treatment of hydrochloric acid (4-6%) and nitric acid (2.5-3.5%) to identify localized hardening/softening of martensitic steel caused by overheating during processing.
Key points of technical implementation
Material applicability
The standard clearly states that H-11 tool steel and 440C stainless steel can be effectively inspected, while materials such as A286 nickel-based alloy are not suitable for etching inspection.
Process Control
- Solution Configuration: Hydrochloric acid (20° Baumé) diluted 4-6% by volume, nitric acid (40° Baumé) diluted 2.5-3.5% by volume
- Post-treatment: Non-surfactant treated parts should be baked at 375°F±25 (191°C±14) for at least 4 hours
Common Defect Identification
Defect Type Visual Characteristics Cause Localized Overheat Softening Light Brown/Dark Gray Area Surrounded by Gray Background Processing Temperature Exceeded Rehardened Area Bright white areas surround black areas Improper cooling
Recommendations for implementing the standard
- Establish an annual review file for inspectors (including vision records/test scores/practical operation videos)
- For special alloys such as Inconel 718, use the customized checklist in Appendix B
- Uninspectable areas require verification of process parameters (such as cross-section analysis of pre-production parts)
SAE ARP1923B-2023 history
- 2023 SAE ARP1923B-2023 Qualification and Certification of Etch Inspectors
- 2018 SAE ARP1923B-2018 Qualification and Certification of Etch Inspectors
- 2013 SAE ARP1923B-2013 Qualification and Certification of Etch Inspectors
- 2011 SAE ARP1923A-2011 Qualification and Certification of Etch Inspectors
- 2002 SAE ARP1923A-2002 Qualification and Certification of Etch Inspectors
- 1995 SAE ARP1923-1995 QUALIFICATION AND CERTIFICATION OF ETCH INSPECTORS
- 1985 SAE ARP1923-1985 Qualification and Certification of Etch Inspectors
