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







Related Discussions:- Tungsten inclusions, Assignment Help, Ask Question on Tungsten inclusions, Get Answer, Expert's Help, Tungsten inclusions Discussions

Write discussion on Tungsten inclusions
Your posts are moderated
Related Questions
how to culculate stress in unsymmetrical bending

Hi ... I have a final project I need to finish it soon about 3 weeks from now ... to design any machine by the Solidworks program .... please feed me back if you can .. thank you

Q. What are the basic use of Sand rammer? It is the apparatus of make specimens of moulding sand, for tests such as - permeable test, the various strength tests, and shatter te

Carburettor Cleaning:  Carburettor needs to be cleaned otherwise the jets may get clogged which may supply an inadequate amount of air fuel mixture. Inadequate amount of air fuel

(a) Describe the terms "Fluid jet" and "Vane" in Fluid Machine. (b) What is impulse - momentum principal in analysis and design of turbo machines.

Determine the load on beam: A rectangular beam of width 200 mm and depth 300 mm is simply supported over a span of 5 m. determine the load that the beam may carry per metre le

what is the formula for measuring the safe speed to drive for a cyclist

For the collapse loads indicated in Figure Q3, find the required plastic moment of resistance (M p ). The frame members have varying plastic moments of resistance as indi

Q. Describe Dry and wet parting materials? Dry parting materials: These are applied by dusting. These include : charcoal, ground bone and limestone, lycopodium(a yellow veget

The features of a typical fermenter (as shown below) are engineered to enable efficient culture of microbial, mammalian or insect cells and  facilitate  ease  of operation for the