Thursday, February 13, 2014

Re: [MW:20091] Black spots on DSS Weld Joints.

Dear Rao:

What gas have you used...?
Have you supplied your shielding gas from a reputed supplier (certificate etc.)...?
Shielding gas with low quality can cause such black spots.

Regards
Ramin Kondori
Sr. QA/QC Engineer
SINOPEC

r.kondori@petroyada.com
+98-2123592322
+98-9132150320



On Thu, Feb 13, 2014 at 12:11 PM, prem_nautiyal26 <prem_nautiyal26@yahoo.com> wrote:
How you can get slag inclusion in TIG ????

Regards 
Prem Nautiyal


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Bharat Kumar <asopa.bharat@gmail.com> wrote:
It looks like slag inclusion.


On 12 February 2014 15:08, Vasantharao <vasantharao@yahoo.in> wrote:
Dear Experts,

We observe Dark spots on Welding of Duplex Stainless Welds.  

Material is : UNS S31803 ,  Filler Wire for root - ER2594, rest ER2209.

Sample pictures are attached for reference.

Oxygen level in shielding / Purging maintained well below 0.2%.

Interpass <150 Deg.C

Pl. share your valuable information.

Thank you.

P.Rao

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Thanks & Regards,

A Bharat Kumar
+91 9989717650

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