Possibly, you may have some surface contaminants on the filler wire or the parent material which are reacting to the heat of the welding process.
Does your welder have clean gloves? Are the filler wires being individually cleaned with alcohol wipes?
Was your bevelled end prepared with a machine which uses a cutting fluid? The inner walls of a GTAW joint should be ground clean of oxides and cutting residue 50 mm from the root face. The inner surface should be shiny after this cleaning/grinding.
You may want to periodically check the purity of your purge before and during welding. It should be completely free of Oxygen... pure Argon.
Good luck,
Darcy Morin
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of shamesh Lotlikar
Sent: July 15, 2010 10:17 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:5993] Problem wk\hile root run
Hieee Pankaj,
Kindly check the argon gas purity and also check the purging is sealed properly or there is any leakage and air is entrapping inside. kindly check what is parent material , and welding consumable if the consumable is right for parent material. check all those parameters.
regards
shamesh lotlikar
welding consultant
Kindly check the argon gas purity and also check the purging is sealed properly or there is any leakage and air is entrapping inside. kindly check what is parent material , and welding consumable if the consumable is right for parent material. check all those parameters.
regards
shamesh lotlikar
welding consultant
From: pankaj abhang <pankaj.abhang1@gmail.com>
To: materials-welding@googlegroups.com
Sent: Fri, July 16, 2010 9:29:09 AM
Subject: Re: [MW:5992] Problem wk\hile root run
Check your fillerwire grade if GTAW if ok then chek its chemistry.
I think this problem is with your filler wire.
PANKAJ
On Wed, Jul 14, 2010 at 6:27 PM, waman nilesh <wamannp@gmail.com> wrote:
I have problem while doing root run the weld get black from backside as we have maintain the backing 10 lpm & Shielding 12 lpm as per WPS.Can anybody tell me the reason & how to avid it.Nilesh--
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