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[MW:3497] Re: Porosity

By Materials & Welding
Hi,
 
1) Check the operator is changed or not and confirm his skill.
2) If the coil is kept opend for long periode one type of fungus will develope over the coil. Check and confirm.
3) Check gas flow is increased or not.
4) Change the orifice gas cup and check.
 
Regards,
Ibrahim

2009/10/12 ozgur kalyoncuoglu <okal1@yahoo.com>
Dear Friends;
 
We are constructing a pipeline with Semi - Automatic Orbital GTAW Welding System which is consist of cladded pipes. Pipe Material is API 5L X65 + Inconel 625 Overlay. We have completed nearly 20 km and when we were in a shortage of wire, we ordered a new batch of wire (Inconel 625). After receiving this wire we had porosity in all the joints especially below 3 oclock position.
 
Our habitats are in perfect condition, there is no any small wind inside.
Our gas (Argon) seems clear (up to this time we didnt face any problem).
We are cleaning the bevels with acetone.
 
Under the light of above explanations can you suggest me someways, how to avoid this porosity other than changing the wire.
 
Best regards
 
Ozgur
 






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Thanks & Regards
Muhammed Ibrahim PK

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