Hi..
We have used Dillimax 690PE material for our penstocks under construction.
Experienced delayed cracking in welds (after a month or so) in all most all the welds...in all 3 welding processes used SAW, SMAW, FCAW...cracks are only in the welds!!!
Process is PH 100-150 DegC, Interpass 200 Deg C and DHT 200-250 DegC for 3 hrs.
Can anyone have any idea what could be the reasons?? we are in soup...and not able to proceed further..
rgds
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