Testing Sequence (2) Flashcards
1
Q
Six basic steps for MT inspection
A
- Part Preparation
- Magnetization Methods
- Application of the Particle Media
- Inspection and Interpretation
- Demagnetization
- Post-Cleaning
2
Q
Part-Preparation
A
- Disassembly
- Plugging or Masking
- Pre-inspection Cleaning
3
Q
Examples of cleaning methods
A
- detergent and aqueous
- solvent
- steam
- ultrasonic
- mechanical
- vapour degreasing
4
Q
Detergent and Aqueous Cleaning
A
- neutral, alkaline, acidic solutions
- rinsed and dried prior to inspection
- per and post cleaning
- emulsifiers and corrosion inhibitors
- removal of light oils, grime, soil or dirt and mild grease
5
Q
Solvent Cleaners
A
- non-halogenated petroleum naphtha
- removal of moderate grease and oils
- highly portable
- may leave film or residue
6
Q
Steam Cleaning
A
- form of alkaline or detergent
- diluted solutions combined with steam in the form of a spray
- common for remote worksites
7
Q
Ultrasonic Cleaning
A
- adds ultrasonic agitation to a solvent or detergent
8
Q
Mechanical Cleaning
A
- shot, grit, sand blasting, power and manual wire brushing, metal scraping or grinding
- abrasive cleaning
- can mask fine surface discontinuities
- consider type of current being applied
9
Q
Vapour Degreasing
A
- removing heavy soils, grease and oils
- methyl chloroform and trichloroethane (historically - bad for environment)
- toxic vapours and flammable
10
Q
Variables to consider when choosing a cleaning method
A
- type of contaminants
- brittle specimen
- specimen surface condition
- accessibility
- further processing?
- cost and availability
