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Q:-When using multiple SAW arc systems (twin wire etc) the arc after have different polarities are used as AC rather than DC polarity. This is to,

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  • Prevent the arc blow between the arcs
  • To minimize the productivity
  • To even out the power factoron the main supply
  • Make it easier to initiate the arc

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Q:- A plug weld and a spot weld differ in which h of the following

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  • A plug weld has a hole in one member 
  • A spot weld has a hole in one member 
  • A spot weld is an arc weld 
  • A plug weld is a friction weld

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Q:- Ductile brittle transformation temperature of a welded specimen is affected by:

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