Sunday, September 9, 2018

[MW:28249] Pulse GMAW-Black spots observed- Argon +2%CO2

Dear expert,

Problem observed:
After welding Black spots are seen on weld. These black spots are not removed even after pickling & passivation.

MOC - SS 347
Filler metal - ER347
Dia. - 1.2mm
Gas used Argon + 2% CO2
Mode - Pulse
Flow rate - 10lpm

Note:

EDS analysis of weld doesn't show any carbon content.


Pl suggest some remedy by which these black spots can be avoided.


Regards,

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