[MW:4960] RE: 4958] Super Duplex Welding

Dear Phino,

You can try with the following.

Shielding gas composition may be modified to: % of CO2 can be reduced to 0.5 and helium can be increased to 20-30%.
Pulsed arc technique shall be used in order to avoid porosity and spatters.

Regards,

L. Prabhu kumar,

Sr. Principal Engineer,

Equipments & Materials Dept.,

Saipem India Projects Limited,

Nungambakkam High Road, Chennai - 600 034, India.

Tel:+91 44 43906588, Ext.: 588, Fax:+91 44 66840345,

Mobile Ph. No.: +91 9003010978.

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Rui.Pinho@pt.linde-gas.com
Sent: Monday, April 26, 2010 5:16 PM
To: materials-welding@googlegroups.com
Subject: [MW:4958] Super Duplex Welding

Dear All

We have problems for welding Super Duplex Nº 1.4410 (see attach of Base Material Certificate) with8 mm thickness.
The process is GMAW - MAG welding an use wire electrode AWS A5.9-06 : ER2594 (see attach of Wire electrode Certificate) and the shielding gas is Ar+20%He+2%CO₂

The bead of first pass is OK, but the next pass (interpass) have lots of porosity, no penetration and Spatter.

Will bo control the temperature of interpass?
Will be change the wire electrode?

Thanks for help

Best Regards

Rui Fernandes Pinho
Divisão de Gases Industriais
Desenvolvimento de Aplicação de Gases

Linde Sogás, Lda.
Travessa Joaquim Dias Salgueiro, Nº 44
4470-416 Vila Nova da Telha, Portugal
Phone + 351 22 999 8380, Fax: + 351 22 996 4039
Mobile + 351 91 473 9197
rui.pinho@pt.linde-gas.com, www.linde.pt

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