| Doc. No: KKM/GWI/35 | WORK INSTRUCTION FOR MAGNAFLUX CRACK DETECTION |
| Rev. No.: 01 | |
| Rev. Date: 20.11.2012 |
- Power on the machine & check the fluid for proper flow. Give 10 minutes for proper agitation.
- Power on the ultra-violet lamp.(Min- for 5 Minutes) before start of inspection process.
- Visually check the 100% parts for scale, rust, oil etc. before MPI.
- Set the machine for direction of magnetisation (longitudinal/combined) as per the requirement.
- Set the current between 1200-1900 amps. Or as required level.
- Clean the standard test piece & jobs thoroughly by washing in kerosene oil/fluid.
- Clean the job and put ASTM test piece on the job.
- Start magnetization (Increase or decrease the current till the defect is clearly visible).
- Spray the job with Carrier Oil & magnetic powder mixture & apply current as soon as the spray is stopped.
- Inspect under ultraviolet light. (The defect will be visible as fluorescent line streak or as the defect morphology).
- Change the current until cracks on ASTM test piece are visible.
- Remove ASTM test piece.
- Apply current and see the jobs for surface defects. (The defect will be visible as fluorescent line streak or as the defect morphology).
- Demangnitize the jobs after inspection & check the residual magnitisation with residual field indicator.
Precautions/ सावधानियां:
- Remove wrist watch before using the machine.
- Apply Kerodex cream on hands & exposed skin before starting the machine.
- Clamp the jobs tight. Replace copper pads if worn out otherwise electric sparking during current flow may start fire.
- In case of fire, power down the machine immediately and raise alarm.