Re: [MW:6007] Problem wk\hile root run

Hi, all there all possibility you have mention above but 

 Joint - Plate to plate ( SA 240 Type 304 )

Thickness- 6 mm

Type of Joint- ' V ' Butt

Backing gas- Argoan

Process - GTAW

Filler wire - ER 308 L ( 2.5 mm )

Root Gap - 2-3 mm

But as I have increase the backing gas to 12-14 lpm the weld become normal is it due to improper sealing of backing gas.

 

Nilesh

On Fri, Jul 16, 2010 at 11:50 PM, Morin, Darcy (Bantrel Constructors) <MorinD@bantrelconstructors.com> wrote:

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

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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

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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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