RE: [MW:5988] Problem wk\hile root run

What is the material, joint details, backing gas delivery & retention
method, welding position, welder's previous experience? I assume GTAW.

BR
-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of Muhammed
Ibrahim PK
Sent: 15 July 2010 14:21
To: materials-welding@googlegroups.com
Subject: Re: [MW:5986] Problem wk\hile root run

change the purging to 6-8 ltr.
reduce the root gap

Thanks & Regards
Muhammed Ibrahim PK

On 15 July 2010 10:27, 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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