From: "GERING, Erwin" <Erwin.GERING@airliquide.com>
To: materials-welding@googlegroups.com
Sent: Mon, November 9, 2009 10:56:20 AM
Subject: [MW:3613] RE: 3609] E316 SS plate - porosity issues
Dear Mahandra,
To prevent moisture pick up please use vacuum packed stick electrodes.
Oerlikon has also 316L – stick electrode in vacuum packed packaging.
If you have carton box, you will have always this risk.
Of course redrying in oven is technically a good solution (mostly 1- 2 hours 300 -350 degr C) if you are not sure (carton box).
Better is vacpac.
With kind regards,
Erwin GERING
Van: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] Namens mahen dran
Verzonden: zaterdag 7 november 2009 14:55
Aan: materials-welding@googlegroups.com
Onderwerp: [MW:3609] E316 SS plate - porosity issues
Hi,
I am mahendra from KSA.
using 316L oerilicon electrode over 316L plate ((Flange joints - thickness around 8 mm)),
which creates porosity issue sometimes here . WPS and PQR are followed properly and there are no significant variation.
The electrode supplier suggests to use it in rebake oven.
We knows low hyd. electrodes which are ending with 5,6 and 8 are to be used with oven.
Is it correct way or normal proceudeure to use the SS electrode in oven ?
What is the control parameter to eliminate the porosity issue after welding (Especially in SS plate)
mahendra.t
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