Question

identify the r in the aws classification for mild steel electrodes. hydrogen level in ml/100 g welding position minimum tensile strength in ksi indicates impact requirements electrode type of coating and current indicates requirements of absorbed moisture test

Explanation:

In the AWS (American Welding Society) classification for mild - steel electrodes, the "R" in the designation indicates requirements of an absorbed moisture test. This is an important aspect of electrode quality control as moisture in electrodes can lead to issues like porosity in welds.

Answer:

Indicates requirements of absorbed moisture test