1. Environmental conditions MT and PT are messy in rain, wind, or dust. Penetrant washes away, particles won’t hold. UT on hot surfaces: couplant dries, readings drift. RT in the field: weather, lighting, and wind can all complicate set-up and safety zones. 2. Access and geometry Tight spaces make...
Make sure surface is bone-dry before applying penetrant Watch dwell times closely — too short misses flaws, too long causes bleed-out Apply developer evenly; clumps will mask fine cracks Confirm light intensity (visible or UV) with a calibrated meter Record and clean thoroughly after inspection —...
Match probe frequency/angle to the weld geometry Use fresh couplant and reapply often on hot or rough surfaces Scan in multiple directions to rule out geometry echoes If signal is unstable, re-check wedge wear and cable connections Always compare suspect signals to calibration block responses...
Verify source strength and exposure time with a calculator, not guesswork Shield scatter paths with lead or flexible shielding if images look fogged Keep film cassettes clean and sealed; dust and light leaks cause false calls Confirm correct IQI placement and orientation before exposure After...
