Question

identify the 8 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 classification of mild - steel electrodes like E7018 - 1 H4R, the digit '8' indicates the type of coating and current. It specifies that the electrode has a low - hydrogen potassium coating and can be used with AC, DC reverse, or DC straight - polarity.

Answer:

Type of coating and current