While using ER 70 S-2, first clean the filler wire with Emery paper and then do the welding. Good interpass cleaning is required . If backside accessible then that also needs cleaning.
The impurities / slag may be due to the chemical composition of filler wire and might show as defect in RT film if not cleaned
Other alternative is to change to ER 70S- 6 filler wire.
Regards,
Anup N K E
--Dear Experts,
Kindly refer the attached job of eco coil of Boiler in tube to tube joint welding application.
During GTAW welding with ER70S-2 grade filler wire we have noticed liquid type impurities on weld bead.
Why such type of defects are coming?
Is it product defect or welding process defect?
Please support & share your views to move in right direction.
Thanks & Best regards
PT
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