Re: [MW:22290] Compare Argon with Nitrogen as Purging gas for Super duplex stainless steels

100% pure Argon is the right choice, please ensure Oxygen content does not exceed the recommended limit in ppm. This has a wide variation depending on end usage, for eg 0.5% when with the residual oxygen it is still possible to pickle the weld if post weld cleaning is allowed in special circumstances. Many codes and manufacturers do not allow any colours which would mean a restriction of 50ppm will apply

Thanks,

Sent from my iPad

On 19-Nov-2014, at 5:08 pm, Naasief Navsa <NNavsa@flexonics.co.za> wrote:

Hi All,

 

We use 100% Argon as a shielding gas when welding our super duplex stainless steel, we use Tig welding on our tube mills. We then hydro form these tubes, but find that weld failures are more prevalent with the super duplex stainless steels than with the other stainless steels we weld (i.e. 316, 312, etc).

 

Does anyone have any suggestions. Is there anything different we need to do when welding the super duplex stainless steel?

 

Regards,

 

Naasief

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Noe Mota
Sent: 18 November 2014 07:44 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:22286] Compare Argon with Nitrogen as Purging gas for Super duplex stainless steels

 

The best approach for gas purging when welding super duplex is argon 100%.

El nov 16, 2014 9:56 p.m., "Murugesan Jeyaraman" <jmurugesan@gmail.com> escribió:

Dear All 

 

Which gas is better for purging gas of super duplex stainless steel welds. 

 

Please compare both technically, also suggest which is best to use in Duplex SS purging?  Is there any difference at all or both just gives equal result?

 

--

Thanks and Regards

 

Murugesan 

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