Pages

Wednesday, March 22, 2017

Supplementary Processing Elements

Braze procedure

1. Cleaning

  • Chemical
  • Mechanical
  • Nickel plate
  • Furnace clean
  • Hydrogen fluoride

2. Assembly

  •  Placement weld
    • Tack
    • Spot
    • Resistance
  • Fixturing

3. Alloy application

  • Cements
    • Product of the paint industry
    • Temporary binder
      • Poly isobutylene
      • Acryloid
      • Polyvinyl / gum / cellulose / parahydroxybenzonate
    • Burns off at 480 °C (900 °F)
  • Pastes
    • Product of the food industry
    • Long term powder suspension
    • Burns off at 480 °C (900 °F)
    • Water soluble or organic base 
  • Product of the food industr
  • Long term powder suspension
  • Burns off at 480 °C (900 °F)
  • Water soluble or organic base

4. Stop-off application 

  • Deterrent to flow
  • Ceramic plus vehicle
    • Alumina
    • Calcium carbonate
    • Titania
    • Boron nitride
    • Poly isobutylene
    • Lacquer

5. Thermal cycle 

  • Furnace bake-out
  • Thermocouple / temperature measurement 
  • Preheat
  • Braze time / temperature
  • Cool down

6. Post treatment

  • Thermal
  • Chemical cleaning
  • Mechanical cleaning
  • Mechanical dimensioning

7. Inspection

  • Non-destructive
    • Visual
    • X-ray
    • Ultrasonic
    • Liquid penetrant (ultraviolet)
  • Destructive
    • Tensile
    • Hardness
    • Metallography

No comments:

Post a Comment