Re: [MW:24488] Dissimilar welding

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

On Fri, Mar 11, 2016 at 11:15 AM, <dilintas@gmail.com> wrote:

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 

Sent from my BlackBerry 10 smartphone.
  Original Message  
From: Pravin G
Sent: Παρασκευή, 11 Μαρτίου 2016 - 06:46
To: 'Agustin Jimenez' via Materials & Welding
Reply To: materials-welding@googlegroups.com
Subject: [MW:24479] Dissimilar welding

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

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