welding of cladded (alloy 625) pipes with single side access

[Himan Nikdin]

Dear Experts

I need a practical guide or sample WPS for welding of cladded (alloy 625) carbon steel pipes with one side access. the size of pipes are minimum  4".

Regards,

H.Nikdin

[pgoswami]

Hi Himan,

 

Please see the practical guideline for your reference. The highlighted texts would be helpful. Feel free to ask if have any clarifications. For single sided FP welds, ER-NiCrMo-3(625 type) consumables are the only options.

 

Thanks.

 

 

Pradip Goswami, P.Eng,IWE
Independent Welding & Metallurgical Engineering Specialist & Consultant.
Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299

pgos...@quickclic.net

pradip....@gmail.com

 

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[Himan Nikdin]

Dear Pardip

Thanks for your help and sending that practical guide my proposal is;

Buttering of the edge of joint up to 1/3 of pipe thickness by INCONEL 625 filer (ENiCrMo-3 /ERNiCrMo-3), then continue welding of root pass by INCONEL 625, after completion of root pass fill and cap the joint by carbon steel electrode/filer.

what do you think about it?

Regards,

Himan Nikdin

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From: pgos...@quickclic.net
To: material...@googlegroups.com
CC: himan....@outlook.com
Subject: [MW:24860] RE: 24837] welding of cladded (alloy 625) pipes with single side access
Date: Wed, 25 May 2016 00:13:24 -0400

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[pgoswami]

Just forget it. You can’t deposit Carbon Steel on the top of 625 weld deposit. Welds will simply crack. Stay with 625 deposit all the way. That’ one of the problem on single sided welding of 625 clad pipes. What’s the thickness of the pipes involved and the design specification???

To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/BLU180-W205824C28A8020EA5EFE579E420%40phx.gbl.

[Jithesh Premachandran]

Hi Nikdin,

After buttering (around 1.5mm thick alloy 625 overlay), machine it and match both ID. Then weld the root and hot pass with GTAW (ERNiCrMo-3) then fill up passes with SMAW process. 

Dont deposit any carbon steel deposits on the groove. Even you use Carbon steel bullets for fit up will leads to crack of groove weld deposits.

[HUY HOÀNG]

dear sirs,

Cant use 7018 right after ernicrmo-3 finish. You must have butter in between, otherwise it will cause cracking. Thats for sure. We havent even mentioned the heating issue yet.

Vào lúc 13:18:21 UTC+7 ngày Thứ Tư, 8 tháng 6, 2016, Jithesh Premachandran đã viết:

[Rakesh Kumar Yadav]

Hi
Thanks for this wonderful insight,even CS bullets on groove for fitup can cause cracking.
Any suggestions on how-to carry out fit up in such scenario.
Thanks in Advance

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