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Re: [MW:26443] Welding of copper alloy E-CuAl-A2

By Materials & Welding
Hi!
Just to share My experience with CuAl-A2 Al Bronze overlay
I) In multiple layers of Al Bronze cracks/gives lot of porosity  and particularly after machining the surface Al Bronze have high hardness  and in multiple weld  layers it cracks (
ii) This is causing mainly due to higher Aluminum in electrodes therefore with SMAW process compared to GTAW 
ii)For multiple  layers Preferably use barrier layer of soft weld try with CuNiAl type
iii) Use GTAW process 
With all other good engg practices you should be able to overcome the problem
Regards
Hegde


On Sunday, 16 April 2017 4:01 PM, Kannayeram Gnanapandithan <kgpandithan@gmail.com> wrote:


Proper cleaning, keep electrode in dry condition, keep short arc, proper preheat. Slight peening to be done

On 16-Apr-2017 11:58 AM, "Mohamed Elsahhar" <mohamed.elsahhar2000@gmail.com> wrote:
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Dear friend,

Tray to pre cleaning for surface of work piece before welding. Can you tray the same welding process on new sample of carbon steel (separate one new one) . Tray it may be surface have contamination making this porosity .

Keep in contact 
M.elsahhar
QA/QC Engineer
002 01220 938021

On Apr 14, 2017 2:25 PM, "Amit Mavai" <mavai2003@gmail.com> wrote:
Good Morning All.
 Dear all i have a quarry regarding weld overlay of brass on on carbon steel.
I did the weld overlay of E-CuAl A2 electrode on carbon steel forging by process SMAW. As the electrode used was 3.15mm , all the parameters were set i.e current was 110Amp & voltage was 22, travel speed was normal.
After welding i faced a problem that i found huge porosity in the weld bead after grind. I tried all the efforts to remove the porosity but it fails to find the root cause.
So this is request to all of you kindly suggest me for smooth and fine weld.
 
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