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Re: What does T-4 stands for?

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On 12/30/96, Edward Li asked - What does T-4 stand for:

Under the AWS specifications for welding electrodes, weld filler 
metals are assigned a classification.  Flux Cored Arc Welding 
(FCAW) electrodes are specified under AWS specification A5.20.  Under 
the classification of this system, electrodes are classified as:


The first X indicates the ultimate tensile strengths in 10 ksi 
increments.  Thus - the 7 indicates 70 ksi minimum ultimate tensile 

The second X indicates the primary welding position the electrode is 
approved for. A "0" indicates flat and horizontal welds A "1" all 

The" T" indicates the FCAW process

The final X describes individual useability and performance 
capabilities.  Electordes with this final "X" equal to 1, 5, 6, and 8 
have specific Charpy V-Notch toughness.  Electrodes with  a final X 
equal to 2, 4, 7, 10 and 11 do not.  Note - that other 
characteristics are described by this designator as well.

Thus - E70T-4 represents an electrode classification that deposits 
minium 70 ksi metal, approved for flat and horizontal welding, FCAW 
process, not rated for notch toughness.

This and other valuable information that structural enigneers 
desigining steel should know may be found in FEMA-267 Interim 
Guidelines for Evaluation, Repair, Modification and Design of Steel 
Moment Resisting Frames.  All SEAOC members were sent one of these 
early in 1996.  Other interested parties can get one free by 
contacting FEMA at 1-800-480-2520
Ronald O. Hamburger
Project Director for Product Development
SAC Joint Venture