Copper#SS304L brazing
PREM SHANKARDUTT NAUTIYAL
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
CELL : 9820313278
suneel gore
Is it must to do by brazing ? if TIG permissible try using ER Cu Sn-A 2.00mmwire
Regards
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Nimesh Chinoy - SigmaWeld
How big is the job ? If not very large than we can make this joint with Induction Brazing at our end.
Regards,
Nimesh S Chinoy
SigmaWeld
Electronics Devices
Nimesh S Chinoy
Nimesh Chinoy - SigmaWeld
When brazing with torch it becomes difficult since copper will heat much faster than stainless steel. We can use induction heating to heat stainless steel and copper equally. Also once we see the joint it will be easier to comment if the material is likely to flow properly throughout.
Regards,
Nimesh S Chinoy
Nimesh S Chinoy