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What do the 4 numbers on a welding rod mean?

The first two digits of a 4-digit number and the first three digits of a 5-digit number can be used for strength. Is that correct? The last digit shows the position. All position, flat and horizontal, vertical down and overhead and all position, all position, all position, all position, all position, all position, all position, all position, all position, all position, all position, all position, all position, all position, all position.

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