Low current with 100% power percentage

Power percentage is 100% and I have a low current

Problem:

• % going up to 100% after some seconds of welding
   
• A current is dropping down after some seconds of welding
   
• There is a low current of only a few amp’s
   
• Current is dropping significantly down after some seconds of welding

Cause 

• ¨The welding roll might be defect
  • change welding roll

• In case you use a mercury base
  • add some mercury
     
• The pendulum roll might be defect
  • change te pendelum roll
     
• In case you use a mercury based pendulum roll
  • add some mercury

• The transformer step switch might be defect
  • change transformer step switch
     

NOTE: The reason for the low current is due to an open circuit. The wire might be also hot in this case. If you have in general a high power percentage you might reduce the frequency.