[MW:29202] Black spots - GMAW - SS347 weld - Ar+2%CO2 mix.

Dear experts,

Currently we are facing issue of black spots on weld with Pulse GMAW for SS 347 welds.

Gas mixture - Argon + 2% CO2

These black spots even after pickling & passivation are not getting removed.

Pl suggest your expert opinion.

Regards,

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