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[MW:13761] How to increase the penetration of P92

By Materials & Welding
  Dear Experts,
  
   Recently, I met a problem that there has point defects in the fusion line in P92 weld seam.
   Only UT can find out the defect, but RT can not.
   When the welder repaired, we find nothing!
    What are the influence factors?   
    Let's discuss together!

   the pipe is 95mm thick. the electrode is Thermanit MTS 616, 4.0mm.
   How can I increase the penetration?
   What is the proper paramete?
     

 

   Best regards

 

    Roy 

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