The process of removing stock from a metal surface is known as ______

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ALP CBT 2 Fitter Previous Paper: Held on 23 Jan 2019 Shift 1
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  1. soldering
  2. brazing
  3. honing
  4. coating

Answer (Detailed Solution Below)

Option 3 : honing
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Explanation:

Honing:

  • Honing is an abrading process mostly used for polishing bored and reamed holes and external cylindrical surfaces using bonded abrasive stones (called hones).
  • Honing is, in fact, a cutting operation and is used to remove material less than 0.25 mm but sometimes it is used to remove stock up to 3 mm also
  • The honing is mainly used to correct some out of roundness, taper, and tool marks left by previous operation or axial distortions
  • Honing is done by means of bonded abrasive grit sticks (of aluminium oxide or silicon carbide) applied to the surface to be honed under controlled pressure and with a combination of rotary and reciprocating motions of abrasives
  • Most honing is done on an internal cylindrical surface, such as automobile cylindrical walls.
  • After the stock removed by honing, the allowable tolerance is between 0.005 mm to 0.5 mm

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Additional Information

Soldering:

  • Soldering is a non-fusion and non-pressure welding operation.
  • The mechanism by which the joint formation taking place is wetting and surface alloying.
  • The filler material used having a melting temperature less than 427°c
  • Borax is used as Flux material.
  • The filler material used is an alloy of lead and tin known as solder.
  • Filler material entered into the workpiece by means of capillary action.

     F1 Ashik Madhu 19.08.20 D11

Brazing:

  • It is also a non-fusion and non-pressure welding operation. 
  • Filler material- Alloy of Cu and Zn, Cu and Ag, Cu and Al
  • Flux material- Borax
  • Filler material entered into the workpiece by means of capillary action.
  • Filler material melting temperature greater than 427°c and less than the melting point of the base material
  •  
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