[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

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

-------------------------------------------------------------------------------------------------------------------------------------------------------------------
DISCLAIMER: The information contained in this communication is intended solely for the use of the individual or
entity to whom it is addressed and others authorized to receive it. It may contain confidential or legally privileged
information. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution
or taking any action in reliance on the contents of this information is strictly prohibited and may be unlawful. If
you have received this communication in error, please notify us immediately by responding to this email and then
delete it from your system. Saipem India Projects Limited (SIPL) is neither liable for the proper and complete
transmission of the information contained in this communication nor for any delay in its receipt.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------

Heat tint (temper) colours on stainless steel surfaces heated in air // Heat tint

Introduction The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change. Oxidation resistance of stainless steels However, there are several factors that affect the degree of colour change and so there is no a single table of colour and temperature that represents all cases. The colours formed can only be used as an indication of the temperature to which the steel has been heated. Factors affecting the heat tint colours formed Steel composition The chromium content is the most important single factor affecting oxidation resistance. The higher the chromium, the more heat resistant the steel and so the development of the heat tint colou...

Materails FAQs

Q: What are equivalents for standard Q 235 B (and Q 235 A) for U-channels? (asked by: boris.vielhaber@vait.com) A: DIN Nr. = 2393 T.2, 2394 T.2, EN 10025 W. Nr. DIN 17007 = 1.0038 Design DIN 17006 = RSt 37-2, S235JRG2 (Fe 360 B) Q: What is St DIN 2391 BK material? (asked by: dmcandrews@automaticstamp.com) A: Precision steel tubes, cold-finished/hard. Q: What is C.D.W. Boiler Tube? (asked by: montydude123@yahoo.com) A: Cold Drawn Welded Boiler Tube. Q: WHAT IS W.Nr. 1.4301? PLS TELL US IN EASY LANGUAGUE (asked...

The Schaeffler and Delong diagrams for predicting ferrite levels in austenitic stainless steel welds

Introduction Ferrite is important in avoiding hot cracking in during cooling from welding of austenitic stainless steels. 'Constitution diagrams' are used to predict ferrite levels from the composition by comparing the effects of austenite and ferrite stabilising elements. The Schaeffler and Delong diagrams are the original methods of predicting the phase balances in austenitic stainless steel welds. Nickel and chromium equivalents A 'nickel equivalent' is calculated for the austenite stabilising elements and a 'chromium equivalent' ferrite stabilising elements. These are used as the axes for the diagrams, which show the compositional equivalent areas where the phases austenite, ferrite, martensite (and mixtures of these) should be present. Although intended to show the phase balance of weld fillers, these diagrams can also be used to illustrate the phase balance of the 'parent' material. There are different diagrams for dif...

Materials & Welding

Search This Blog