Aolong Dual-Polarity 320kV/450kV Mobile High-Frequency Constant-Voltage X-ray Radiographic Inspection System

Overview

The Aolong Dual-Polarity 320kV/450kV Mobile High-Frequency Constant-Voltage X-ray Radiographic Inspection System is a field-deployable, self-contained non-destructive testing (NDT) platform engineered for high-fidelity internal inspection of metallic and composite structures in industrial, infrastructure, and aerospace maintenance environments. Operating on the principle of bremsstrahlung radiation generation via thermionic electron acceleration across a high-voltage potential gradient, this system delivers stable, reproducible X-ray output under variable load conditions. Its dual-polarity architecture—featuring independently controlled cathode (−225 kV) and anode (+225 kV) high-voltage generators—enables precise beam energy tuning and optimized contrast resolution for both thick-section steel welds and thin-walled aluminum assemblies. Designed for mobility without compromise in radiographic fidelity, the system maintains constant voltage regulation across its full 20–450 kV operational range, minimizing spectral drift during extended exposures and ensuring compliance with ASTM E94, ISO 5579, and EN 462-1 requirements for industrial radiography.

Key Features

• Dual-polarity high-frequency generator architecture supporting simultaneous negative cathode and positive anode potentials up to ±225 kV per side, enabling flexible beam hardening and scatter control.
• Constant-voltage regulation with ≤±1 kV deviation over full load range and thermal cycling, verified per IEC 61331-1 stability criteria.
• Oil-insulated, air-cooled high-voltage generators (70 kg each) with integrated oil circulation monitoring and dielectric strength certification to 30 kV/mm.
• T7000 digital controller featuring 7-inch color touchscreen interface, programmable exposure sequences, automatic tube conditioning (auto-train), and real-time kV/mA/timer parameter logging.
• EMI-hardened control electronics compliant with IEC 61000-6-2 and -6-4 for operation in electrically noisy industrial sites (e.g., near welding equipment or VFD-driven machinery).
• Mechanically interlocked lead-shielded enclosure with safety key switch and door position sensor meeting IEC 61511 SIL 2 functional safety requirements.
• Oil-free water-based cooling system (AL-YLB-4500) rated for continuous-duty operation at ambient temperatures up to 40°C, eliminating fire hazard associated with oil-cooled alternatives.

Sample Compatibility & Compliance

This system accommodates ferrous and non-ferrous components ranging from 5 mm aluminum to 120 mm steel equivalent thickness, compatible with standard industrial film (ASTM E1815 Class II), phosphor imaging plates (ISO 17636-2 Type B), and flat-panel detectors (IEC 62495). All mechanical, electrical, and radiation safety subsystems conform to national and international regulatory frameworks including GB/T 16544 (China), IEC 60529 (IP54 ingress protection), IEC 61331-3 (radiation leakage limits ≤1 µSv/h at 1 m), and EU Directive 2013/59/Euratom for artificial radiation sources. The controller’s audit trail functionality supports GLP/GMP-aligned documentation workflows, with timestamped parameter records stored locally for traceability.

Software & Data Management

The T7000 controller firmware provides embedded exposure parameter management, including user-defined presets, exposure history (last 1,000 cycles), and configurable alarm thresholds for kV/mA drift, coolant temperature, and interlock status. Data export is supported via USB 2.0 to CSV format for integration into enterprise quality management systems (QMS). While no proprietary cloud platform is included, the system’s RS-485 and Ethernet interfaces allow third-party SCADA or CMMS integration using Modbus TCP or OPC UA protocols. All firmware updates are delivered as signed binary packages to ensure integrity verification prior to installation.

Applications

• Field inspection of pipeline girth welds, pressure vessel nozzles, and offshore structural joints under ASME BPVC Section V, Article 2.
• In-service evaluation of railcar underframes, locomotive axle boxes, and bridge pin connections where fixed radiography facilities are inaccessible.
• Pre-shipment verification of castings and forgings in heavy machinery manufacturing per ASTM E192.
• Emergency NDT response for post-disaster infrastructure assessment, including concrete-encased steel reinforcement and modular building welds.
• Quality assurance audits in defense subcontracting environments requiring documented adherence to MIL-STD-45662A calibration traceability.

FAQ

What is the maximum permissible radiation leakage level at 1 meter from the generator housing?
Per IEC 61331-3, measured leakage does not exceed 1 µSv/h at 1 m under worst-case operating conditions (450 kV, 30 mA, continuous duty), verified by third-party type testing.
Can the system be operated from a portable diesel generator?
Yes—provided the generator supplies stable 220 VAC ±10%, 50 Hz ±2%, with THD <5% and minimum 8 kVA capacity to accommodate inrush current during HV startup.
Is the T7000 controller compatible with English-language UI or third-party DICOM viewers?
The standard UI is Chinese-only; however, firmware revision 3.2+ supports UTF-8 localization files for OEM-customized English overlays. DICOM export requires external image acquisition software interfacing via Ethernet.
Does the system include calibration certificates traceable to national standards?
Each unit ships with factory calibration reports for kV (NIST-traceable resistive divider), mA (shunt-based), and timer accuracy (±0.1%), valid for 12 months from date of shipment.
What maintenance intervals are recommended for the oil-free water cooler?
Coolant replacement every 24 months; pump impeller and filter inspection every 6 months; conductivity monitoring weekly during active use per AL-YLB-4500 service manual section 4.3.