EDDY CURRENT TESTING (ECT) SERVICE – AITECH

1. Introduction

Eddy Current Testing (ECT) is a non-destructive testing method that uses electromagnetic induction to detect surface and near-surface defects in conductive materials. At AITECH, we employ AVIKO 4080 G2 machine to conduct 100% inspection of steel balls used in wind energy, precision machinery, and automotive industries.

2. Working Principle

An alternating current is applied to the probe to generate a magnetic field. When the probe is placed near a metallic surface, eddy currents are induced. Defects disrupt the current flow, resulting in a change in electrical impedance, which is recorded and analyzed.

3. Our Testing Procedure

???? Step 1: Preparation

• Balls are demagnetized (<1 Gauss)

• Testing room controlled at 18°C to 28°C, dust-free and free of direct sunlight

• Clean surfaces are mandatory

???? Step 2: Equipment Calibration

• Use certified Master Balls with artificial defects for sensitivity setup

• Adjust frequency, phase angle, and gain for each ECT channel

• Calibration check performed every 4 hours or per batch

???? Step 3: Inspection

• Steel balls pass through AVIKO’s high-speed ECT sensors

• Automatic classification:

  • Acceptable (OK)

  • Reworkable (repair and retest once)

  • Rejected (NG)

???? Step 4: NG Ball Handling

• NG balls undergo Macro Test using hydrochloric acid

• If cracks or metallurgical defects are found, balls are scrapped

4. Equipment & Technology

• AVIKO 4080 G2 – EN 15548 compliant

• Multi-frequency ECT Sensors (150–3600 kHz, standard at 400 kHz)

• 2-core and 4-core ferrite probes available

• EMT software allows phase angle and gain adjustments

5. Standards Followed

• SNT-TC-1A (2024 Edition) – Personnel qualification

• EN 15549, EN 15548-1/2/3 – ECT system performance and compliance

• P3C-WE-0014 – Bearing processing requirements

• AITECH-NDT-WP-001 – Internal written practice for certification

6. Applications

• Steel balls for wind turbine bearings

• Components for precision machinery

• Balls and parts in automotive and aerospace sectors

• Round or spherical conductive parts

7. AITECH’s Quality Commitment

• Technicians certified to Level II

• Procedures approved and audited by Level III expert

• Regular sensitivity validation and system calibration

• Full reporting with defect data, images, and traceability

8. Contact Us

• Address: 119/27 Bui Quang La, An Hoi Tay Ward, Ho Chi Minh City

• Branch: 23, Street 27, Van Phuc  Residential, Hiep Binh Ward, Ho Chi Minh City

• Hotline: (+84) 98 139 8185 – 090 886 4479

• Email: aitech@ndt.com.vn

• Website: https://ndt.com.vn