Welding process selection.

[Dinesh Somwanshi]

Dear sir,

I need 1 help from you that as following.

1. we are doing bridge fabrication for L & T as per indian standard.For fillet stiffener welding they have approved SMAW .

During SMAW we found numer of undercuts & slow process in welding.

2. We have recommended to use FCAW E71T-C welding process instead of SMAW E7018 . They are partially agreed & asking to submit that process comparison to choose FCAW to ensure that it fullfill the strenght of weld.

Please share your opinion.

DINESH VITTHAL SOMWANSHI

BACHELOR IN MECHANICAL ENGINEER

AUTHORIZED WELDING / NDT / PAINTING INSPECTION PERSONNEL,

AWS - CWI , CSWIP 3.1

BGAS  Gr 2 / 3

NDT II -UT , RT , MT , PT, VT

00919881344135

असो द्यावी दया तुमच्या लागतसे पाया.

Pray for others, sometime, You might never need to pray for yourself again.....

[rudolf_jude]

Hi Dinesh

Surprised that client is asking to prove the strength. The usage of the particular electrode and spec/lot certificate from the manufacturer should suffice. If you are doing field welding then you will have to prove quite differently as they may not approve fcaw with shielding gas. 

All the best

Sent from my Samsung device

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[Kannayeram Gnanapandithan]

both classification  minimum strength is 70000PSI. In FCAW, if u use Ar+Co2 mixture instead full Co2, u will get better Strength, Toughness etc. IT is allso all position welding. 

THANKS & BEST REGARDS,

KG.PANDITHAN, IWE,  AWS-CWI, CSWIP 3.1,

CONSULTANT-WELDING & QUALITY

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[Sujeeth Kumar]

carry out pqr

 

sujeeth kumar

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From: material...@googlegroups.com <material...@googlegroups.com> on behalf of 'rudolf_jude' via Materials & Welding <material...@googlegroups.com>
Sent: Tuesday, March 8, 2016 3:00 PM
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Subject: Re: [MW:24447] Welding process selection.

 

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[Lalu Rajendran]

Hi,

In that case, you may submit you approved WPS/PQR documents to your Client which shows strength and soundness of weld.

Also you can make a comparison table for both these processes with productability.

regards,

LALU 

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[Kannayeram Gnanapandithan]

in FCAW, shielding gas  is additional (Dual shielding)

Need not bake, hold it Quiver etc 

THANKS & BEST REGARDS,

KG.PANDITHAN, IWE,  AWS-CWI, CSWIP 3.1,

CONSULTANT-WELDING & QUALITY

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/haen73m35jrpwpftl7l7xunh.1457429425378%40email.android.com.

[Lakshman]

Hi,

Plan for a WPS & PQR – it will resolve all your issues…

And plan for a Demo to for the speed of operation.

 

Thanks & Regards,

Lakshman Kumar B,

+91 9440031459.

 

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of Dinesh Somwanshi
Sent: Tuesday, March 08, 2016 2:35 PM
To: materials-welding
Subject: [MW:24446] Welding process selection.

 

Dear sir,

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[Mohd Siraj]

What is welding position.??

other alternative is GMAW for 1G,2G position.

[c sridhar]

You have not indicated the type of base mental, its thickness, size of electrode used etc.

if your client is particular, you can do process compatibility or WPS for the job. 

Towards u/c problems, reasons could be plenty. May be it could be due to excessive current used

for size of the rod, faster travel speed to get more production, higher arc gap during welding and 

like wise. 

Replacing FCAW in place of SMAW process will be more expensive and a loss to you.

GMAW ( SFA 5.18 - ER 70 S-6 ) with either CO2  (or) with Argon + CO2 gas ( to avoid spatter level) 

will be a better option. 

It will help to double your production and also reduce the cost factor to large an extent. 

Sridhar.

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From: 'rudolf_jude' via Materials & Welding <material...@googlegroups.com>
To: material...@googlegroups.com
Sent: Tuesday, 8 March 2016 3:00 PM

Subject: Re: [MW:24447] Welding process selection.

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[Sundar Kumar]

If you are going to do welding in site in multiple positions then SMAW is best option. Portable easy accessible torch.

Deposition rate of FCAW is more as compare with the SMAW .

You need gas when you use E71T-C electrode . where as in SMAW no additional protection is required .

If the site is open yard ,windy and multiple position welding  then SMAW is most preferable as compare to any other welding process . Which gives better protection of weld pool as compare with other welding process in open yard .

Consumable cost is high for FCAW as compare with SMAW .

Undercut is not depends on welding process it depends on welder . Welder can avoid undercut by increasing travel speed. Undercut purely based on welder technique .

Strength of the weld should be proved only with the PQR as per standards . Conduct a PQR for FCAW and prove the strength.

Sundar 

Welding Inspector 

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