Re: [MW:28269] Re: Pulse GMAW-Black spots observed- Argon +2%CO2

Face side

On Wed, Sep 12, 2018, 17:33 sandeep kumar <sandeepdhiman63@gmail.com> wrote:

its on face side or root side?

On Sunday, September 9, 2018 at 6:32:32 AM UTC+3, Hrushikesh Sangamnerkar wrote:

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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