Argon (98%) + Nitrogen (2%) Gas Purging.....

[Ram Chatt]

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 ?

  

[Amitabha.B...@voestalpine.com]

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

--
To post to this group, send email to material...@googlegroups.com
To unsubscribe from this group, send email to materials-weld...@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
 
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-weld...@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.

[Vidhyapathi]

Addition to batt acharya 

Nitrogen is strong austenite former, this will reduce loss of austenite during welding   

Regards, 

Vidhyapathi