[MW:17589] RE: 17584] Difference between GMAW-S and GMAW-STT

Lincoln’s STT process and Miller’s PipeWorx are both short circuiting arc transfer mode GMAW.  The difference is a high level of control on the amperage and voltage to quiet the arc.  However they are still short arc and so must follow the follow the ScIX rules applied to that process. 

 

For welder qualification bend tests are required because lack of fusion defects at the root may not be detected by radiography.  

 

John A. Henning

Welding & Materials

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of M.A.Samdani
Sent: Sunday, April 28, 2013 9:26 AM
To: materials-welding@googlegroups.com
Subject: [MW:17584] Difference between GMAW-S and GMAW-STT

 

Dear Experts,

 

Will we treat GMAW-Surface Tension Transfer (Lincoln Patented) mode exactly like GMAW-Short Circuit mode?

 

For GMAW (STT), welder can  be not qualified on the basis of Radiography as per QW-304-ASME IX?

 

please comment.

 

Regards,

Ali Samdani

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