You may be between a rock and hard place. Replacing the filler metal may be the only reliable option.
I have experienced porosity problems with GTAW filler metal during procedure qualification. After changing welding torches, welding machines, and shielding gas batches, analyzing shielding gas, changing base metal coupons etc., it was found that the filler metal (wire) had residual amounts of drawing compound/lubricant. We found this almost impossible to remove and, even if one could remove it, it would have been excessively costly both monetarily and time wise. I ended up having to scrap the existing stock and repurchase a different brand. Problem went away with replacement filler. Note that this was from a respected, world wide, filler metal company - but they did not draw the wire. It was just rebranded. Caveat emptor.
I suggest that you try and obtain a small amount of filler metal from another manufacturer/supplier. If the problem goes away, then I would condemn the current filler metal and replace it.
John
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of ozgur kalyoncuoglu
Sent: Monday, October 12, 2009 3:06 AM
To: materials-welding@googlegroups.com
Subject: [MW:3491] Porosity
| 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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