Thursday, January 14, 2016

Re: [MW:24098] Clarify copper inclusion & tungsten inclusion

would this be seen on the surface or only during microscopic analysis ? regards

On Wednesday, 22 May 2013 16:10:08 UTC+1, Ramin Kondori wrote:
Dear Tishteo:

If present in base metal (or weld metal), Copper causes hot cracking because of its lower melting point and low solubility in Iron. I have seen this defect in a few steel castings which we repaired them. Those cracks were rather wide and straight.

I have also seen one case in austenitic stainless steel (Type 316) which is called copper contamination cracking or CCC. Liquid metal embrittlement is the mechanism responsible for CCC. You may find this defect in automotive industry where they use copper alloys as resistance welding electrodes. Copper transfers to weld metal or HAZ during electrode contact and causes cracking.

Tungsten has a higher melting point and will remain solid during heat cycles like welding or heat treatment so it s severity is much less than Copper (in steel).

Regards
Ramin Kondori
Sr. QA/QC Engineer
SINOPEC

r.ko...@petroyada.com
+98-2123592322
+98-9132150320



On Wed, May 22, 2013 at 2:03 PM, tishteo <ban...@gmail.com> wrote:
My friends,
Can anyone help me to clarify what is diffirent between copper inclusion & tungsten inclusion. Is copper  caused  of cracking & not permitted but Is Tungsten  permitted following code?
Which one welding process appear defect like this. thanks for your help.

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