Hi! Instead of Using 70:30CuNi use 90:10 CuNi wire with Pulse Tig ,Up slope /down slope welding facilty and ensure proper purging of thye weld , Use higher dia Ceramic Cup Regards Hegde
--- On Mon, 28/5/12, Anil Hegde <nottyanil@gmail.com> wrote:
From: Anil Hegde <nottyanil@gmail.com>
Subject: Re: [MW:14369] Acceptance criteria for welding of Cupro-Nickel pipe
To: materials-welding@googlegroups.com
Date: Monday, 28 May, 2012, 10:11 AM
Mr Megnath , Kindly clean the joint surface by buffing wheel & then take RT . It will get cleared Regards Anil Hegde On Sat, May 26, 2012 at 11:57 AM, Megnath <megnath@gmail.com> wrote: Dear friends,
We are doing welding (GTAW using 99.99% Argon & 70-30 cnsumable) of
CuNi - 90-10 pipe and all of them fall under class 1 pipe and forced
to examine the weld by Radiograpy. On review of radiograph, none of
the joint gets cleared. The only problem with welding is "POROSITY".
As pe our contract, the size of permissible porosity is 0.2t
(thickness of pipe is 3,4mm) and even 1mm porosity calls for repair.
Could any one share your knowledge on the following.
1. Acceptance criteria for RT of CuNi pipe weld
2. How to overcome from the porosity
Best Regards,
Megnath
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