Smar Tac Sensing with Gas Cup/Nozzle possible??? [ArcWelding PowerPac]

Dear All,
Following are the details of the Robotic ARC Welding System Products:-

  1. ABB IRB1600ID ROBOT WITH IRC-5 CONTROLLER.
  2. ESAB WELDING POWER SOURCE Mig 5000i, ESAB Wire Feeder Aristo 3004W
  3. Binzel ABIROB-A500 Welding Gun
  4. CO2 GAS 100%
  5. Welding Wire CuCr 1.2mm
    6.Material Specification:- MS with redoxide coating , 5mm thick.
    Currently we are using the welding wire for smar tac searching. It is working OK. But, due to the problems in the component, Viz. Non-uniform coating of Redixide on the sensing surface, we are not getting the repeatability in search results.
    For avoiding this we are trying to use the Gas Cup/Nozzle for sensing the component.
    For that what changes do we have to do in the existing system hardware???