Dissimilar welding

[Pravin G]

Dear Expert,

Recently we qualify new PQR with following variables:
Material: A516 Gr 70N to A204 TP316L [P1G2 - P8G1]
Thickness: 50mm
Joint: butt joint
Consumable: SMAW, E309L-16, 3.2mm
F No: 5, A no: 8

I did preheat before welding for both material, correct me I’m wrong.

Preheat & PWHT required for dissimilar welding?
Crack recognized immediately after welding, so I assume its hot crack.
Is it related to thermal expansion of CS which cause hot crack?

Kindly advise me how to overcome this defect?

Pravin Poornachandran

Sent from my iPhone

[dili...@gmail.com]

I assume that ASMEVIII-1 us applicable.
In that case you have to preheat and PWHT for A516‎ only. So the best practice is to butter tha 516 with 309-L up to a distance of 50mm from the bevel edge, then PWHT 

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  Original Message  
From: Pravin G
Sent: Παρασκευή, 11 Μαρτίου 2016 - 06:46
To: 'Agustin Jimenez' via Materials & Welding
Reply To: material...@googlegroups.com
Subject: [MW:24479] Dissimilar welding

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[Kannayeram Gnanapandithan]

for 50mm CS, preheat and PWHT is required.  If u do PWHT, E309L is not suitable. U have to choose ENiCrFe3/2 and butter on CS, PWHT and carry out with ENiCrFe2/3, or   directly weld with ENiCrFe2/3 and do PWHT, since ASS is 316L, u may not face problem for sensitisation.  

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/20160311054559.6713426.17225.2156%40gmail.com.

[prem_nautiyal26]

Use E 309 MoL. 

Regards

Prem Nautiyal

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[Agustin Jimenez]

Hi.
I recomended Preheat and PWHT. But you will have make PQR with PWHT.

Agustín Jiménez


Enviado desde mi smartphone Samsung Galaxy.

-------- Mensaje original --------
De: 'prem_nautiyal26' via Materials & Welding <material...@googlegroups.com>
Fecha:11/03/2016 12:29 PM (GMT-04:30)
Para: materials-welding <material...@googlegroups.com>
Cc:
Asunto: Re: [MW:24488] Dissimilar welding

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/56ds2ugjngvx92nnwkdlbu55.1457715544290%40email.android.com.

[james gerald]

First determine whether PWHT is necessary and the service temperature.

In that case please follow Mr.KG pandithan advise because  due to differential thermal expansion  between CS & SS will crack

Else you can use E309MoL to complete the joint

 

Thanks & Regards

J.Gerald Jayakumar

0091-9344954677

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From: Kannayeram Gnanapandithan <kgpan...@gmail.com>
To: materials-welding <material...@googlegroups.com>
Sent: Friday, March 11, 2016 12:00 PM
Subject: Re: [MW:24488] Dissimilar welding

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[Kannayeram Gnanapandithan]

Prem, is it advisable to use E309L/309MoL in the temp range of 600 deg celsius??

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/56ds2ugjngvx92nnwkdlbu55.1457715544290%40email.android.com.