Tungsten inclusions, Mechanical Engineering

Tungsten Inclusions

Tungsten inclusion is a discontinuity found only in TIG welding. Particles of tungsten from the electrode can be embedded in a weld when improper welding procedures are used. Typical causes are as follows:

 

  • The Contact of electrode tip with molten weld pool.
  • Contact of the filler metal with hot tip of electrode.
  • Contamination of  the electrode tip by spatter from the weld pool.
  • Exceeds the current limit for a given electrode size or type.
  • Extension of electrodes beyond their normal distances from the collet (as with long nozzles) resulting in overheating of the electrode.
  • Inadequate tightening of  holding collet or electrode chuck.
  • Inadequate shielding gas flow rates or excessive wind drafts resulting in oxidation of the electrode tip.
  • Defects such as splits or cracks in the electrode.
  • Use of improper shielding gases such as argon - oxygen or argon - CO2 mixtures that are used for gas metal arc welding 
Posted Date: 9/14/2012 9:35:59 AM | Location : United States







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