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.
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.
Regards
On Wed, May 22, 2013 at 2:03 PM, tishteo <bang.2n@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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