In GTAW filler metal designations such as ER70S-t, what is the most common meaning of the 'R' segment?

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Multiple Choice

In GTAW filler metal designations such as ER70S-t, what is the most common meaning of the 'R' segment?

Explanation:
In GTAW filler metal designations, the letters at the start tell you what form the filler metal comes in. The initial “ER” means it’s an electrode filler metal, and the segment that follows indicates the physical form. The common meaning of that segment is Rod, which is the solid cylindrical filler used by hand in TIG welding. That rod form is what you typically pick up from the filler rod tray and feed into the weld pool. Keeping that in mind helps you match the designation to how you’ll actually use the filler metal in the TIG process.

In GTAW filler metal designations, the letters at the start tell you what form the filler metal comes in. The initial “ER” means it’s an electrode filler metal, and the segment that follows indicates the physical form. The common meaning of that segment is Rod, which is the solid cylindrical filler used by hand in TIG welding. That rod form is what you typically pick up from the filler rod tray and feed into the weld pool. Keeping that in mind helps you match the designation to how you’ll actually use the filler metal in the TIG process.

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