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
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???