In GTAW electrode classification ERXXS-Z, what does the 'S' designate?

In GTAW electrode classification ERXXS-Z, what does the 'S' designate?

• A. Solid rod
• B. Surface coating
• C. Structural grade
• D. Sensor integrated

Answer: (A)

In GTAW filler-metal classifications, the middle letter shows the physical form of the filler metal. The S there marks that the electrode is a solid filler metal, i.e., a solid wire/rod without flux coatings or cores. In TIG welding you commonly feed a solid filler, so this designation confirms you’re using solid filler rather than something coated or cored. That’s why the option describing a solid form is the best match. The other choices describe attributes that aren’t what this letter denotes.

In GTAW filler-metal classifications, the middle letter shows the physical form of the filler metal. The S there marks that the electrode is a solid filler metal, i.e., a solid wire/rod without flux coatings or cores. In TIG welding you commonly feed a solid filler, so this designation confirms you’re using solid filler rather than something coated or cored. That’s why the option describing a solid form is the best match. The other choices describe attributes that aren’t what this letter denotes.