How It Works:
- Magnetization: The pipe end is magnetized using either a yoke, coils, or head shot methods (circular or longitudinal magnetization).
- Application of Magnetic Particles: Fluorescent magnetic particles, suspended in a liquid carrier, are applied to the surface.
- Detection Under UV Light: Under ultraviolet (UV-A) light (typically ~365 nm), the fluorescent particles gather at leakage fields caused by surface defects, making the flaws highly visible.
Key Components:
- Magnetizing unit: Applies magnetic field to the pipe end.
- Fluorescent particle bath system: Applies and recycles the inspection medium.
- UV-A light source: For fluorescence inspection.
- Demagnetizer: Optional, used after testing to remove residual magnetism.
- Control console: For operation and parameter control.
Applications:
- Seamless and welded pipe manufacturing.
- Pipe threading plants.
- Inspection after machining or finishing processes.
- Quality control in pipeline fabrication.
Main technical parameters of fluorescent magnetic particle flaw detector:
- Product Standards
- API SPEC 5D drill pipe specification of the American Petroleum Institute;
- API SPEC 5CT casing and tubing specification of the American Petroleum Institute;
- SY/T6194 casing and tubing technical specifications of the petroleum industry standard;
- Product Specifications
- Inspection requirements: Check the inner and outer surfaces and near-surface cracks of the pipe end caused by casting, forging, machining and fatigue.
- Specifications: The flaw detection length is within 350mm.
3. Equipment configuration, technical parameters, and functions
- The design and formulation standard of this machine
<<Magnetic Particle Testing>> JB/T8290-2011 national standard. - Equipment capacity operation time: more than 560 hours/month
- Beat: 15-25 seconds/piece
- Equipment composition
- Power control cabinet (including: operation station,
- control main board and main power board, etc.)
- Magnetization device (including: longitudinal magnetizer, circumferential magnetizer, coil automatic extension mechanism circumferential magnetizer, magnetization head air cylinder feeding mechanism, etc.)
- Control system (Omron PLC)
- Magnetic suspension spraying system
- Fixed UV lamp system and portable UV lamp (LED)
- Fully enclosed darkroom system
- Automatic demagnetization system
- Main technical indicators:
- Input power: three-phase four-wire 380V±10% 50Hz, 350A.
- Duty cycle: 20%.
- Circumferential magnetization current: AC 0-9000A (effective value), continuously adjustable (with power-off phase control).
- Longitudinal magnetization potential: AC: 0-24000AT (effective value), continuously adjustable (with power-off phase control).
- Demagnetization method: attenuation automatic demagnetization.
- Demagnetization effect: residual magnetism ≤3Gs.
- Demagnetization time: ≤3s.
- Magnetization method: single circumferential magnetization, single longitudinal magnetization and composite magnetization. (Yoke induction method for internal hole flaw detection)
- Magnetization coil: The inner diameter of the moving coil is 750mm, and it is sent out by a cylinder with a cylinder stroke of 350mm.
- Pneumatic moving stroke of the magnetization head: 350mm.
- Rotation: It is realized by a cycloidal pinwheel reducer to ensure all-around magnetization and observation, n=5-10 rpm.
- Ultraviolet intensity: The intensity of the workpiece surface at 380mm away from the ultraviolet bulb is ≥ 4000 μW/cm2.
- Air source pressure: 0.4-0.8MP.
