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[MW:2006] Re: Copper#SS304L brazing

By Materials & Welding
Is it must to do by brazing ? if TIG permissible try using  ER Cu Sn-A 2.00mmwire
Regards
SUNEEL GORE

--- On Wed, 22/4/09, PREM SHANKARDUTT NAUTIYAL <prem_nautiyal@rediffmail.com> wrote:

From: PREM SHANKARDUTT NAUTIYAL <prem_nautiyal@rediffmail.com>
Subject: [MW:2005] Copper#SS304L brazing
To: materials-welding@googlegroups.com
Date: Wednesday, 22 April, 2009, 9:00 AM

 
Dear friends

We are trying to braze a SS304L tube # Copper tube with OD=15mm and wall thickness 3mm. The joint is a simple square butt joint. Now we have tried torch brazing with following consumables:
L&T Eutectic 1601 flux + L&T 1601 filler wire.
This is a silver brazing filler wire with @ 40% silver,and balance Cu ,i.e.BAg-4 (EWAC 1601)
However we are not able to achieve torch brazing successfully.
We have even tried with Mathure Silver brazing filler wire and flux, but procedure has failed i.e weak joint.
Actually while brazing the filler material flows towards Copper side and does not flow towards SS304L side resulting in a weak joint and can be easily broken by a blow.
The joint also has to pass helium leak test.

Can anybody suggest suitable brazing procedure and technique.
I have read about furnace brazing but it is not practically possible in our job.
We only have the option of torch brazing.

Regards

Prem Nautiyal
Godrej,Mumbai
Cell: 9820313278
PREM S NAUTIYAL
CELL : 9820313278


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