RE: [MW:19722] Argon (98%) + Nitrogen (2%) Gas Purging.....

Hi,

 

For reasons of simplicity & practicality, it is most common to use the same gas for both backing & shielding. However, the lowest levels of oxidation are obtained using a backing gas with mixture of Nitrogen.

 

The addition of up to 2% Nitrogen in a binary or tertiary gas mixture will raise the partial pressure of Nitrogen above the weld pool in GTAW root runs. This helps to control the nitrogen content in the weld. The addition of nitrogen also compensates for losses in the arc during welding of nitrogen alloyed steels.

 

With Regards

Amitabha Bhattacharya

voestalpine Bohler Welding India Pvt. Ltd.

voestalpine Bohler Application Technology Centre

M. +91-98 33998246

www.voestalpine.com/welding

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Ram Chatt
Sent: Wednesday, December 25, 2013 7:49 PM
To: materials-welding@googlegroups.com
Subject: [MW:19720] Argon (98%) + Nitrogen (2%) Gas Purging.....

 

 

Dear Experts,

 

 

Argon (98%) + Nitrogen (2%) gas purging  for duplex steel (S 32750 A790 P10H) material GTAW welding .what is the purpose mixing with Nitrogen (2%) , its mandatory ?  If not mixing any defects will Occurred in welding ?

  

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