Deal All,
Slight addition here.. When you apply the CuSO4 to the edge of the weld (CS + SS) , there will be no effect on the SS area ( No colour Change) and CS will become the Cu colour. Due to chemical Reaction copper getting deposited (a very thin layer) on the CS surface (similar way SAW wires are getting coated with Copper).
Allying CuSO4 is very much important as we need to ensure that the SS is completely removed from the WEP (weld edge prepared) and back clad (removal of SS up to 5-10mm depend what Welding process used). This is to avoid any Cr getting combined into the wleidng pool which may result in crack prone
Slight addition here.. When you apply the CuSO4 to the edge of the weld (CS + SS) , there will be no effect on the SS area ( No colour Change) and CS will become the Cu colour. Due to chemical Reaction copper getting deposited (a very thin layer) on the CS surface (similar way SAW wires are getting coated with Copper).
Allying CuSO4 is very much important as we need to ensure that the SS is completely removed from the WEP (weld edge prepared) and back clad (removal of SS up to 5-10mm depend what Welding process used). This is to avoid any Cr getting combined into the wleidng pool which may result in crack prone
weld metal.
Regards.
C.K.Purohit
From: Muhammed Ibrahim <ibratech@gmail.com>
To: materials-welding@googlegroups.com
Sent: Saturday, 20 June, 2009 9:37:16 AM
Subject: [MW:2487] Re: Copper sulphate
Regards.
C.K.Purohit
From: Muhammed Ibrahim <ibratech@gmail.com>
To: materials-welding@googlegroups.com
Sent: Saturday, 20 June, 2009 9:37:16 AM
Subject: [MW:2487] Re: Copper sulphate
Hi,
When you apply copper sulphate on clad removed area it will become black if clad is compleately removed. If any clad material is balance on the plate surface the colour will not change.
Regards,
Muhammed Ibrahim
2009/6/19 tong tong <tong2je@gmail.com>
Dear AllAbove subject is referred, what is the purpose of copper sulphate in repairing cladded vessel. Our contractor was submitted one repair procedure for installation of new nozzle on cladded vessel. The procedure mentioned that copper sulphate shall be used to verify all clad material has been removed. It is true? Which reference should i refer? Please advise and thank in advanceRegardsTong2je
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