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 e7018 - 1 h4r

Explanation:

In AWS classification for mild - steel electrodes, the digit after the fourth position (in this case, the '8' in E7018 - 1 H4R) indicates the hydrogen level in \(ml/100g\). The AWS (American Welding Society) classification system has specific rules for each digit in the electrode designation. For example, the first two digits (e.g., '70' in E7018) represent the minimum tensile strength in KSI (kips per square inch). The third digit (e.g., '1' in E7018) indicates the welding position. The fourth digit (e.g., '8' in E7018) is related to the hydrogen level.

Answer:

Hydrogen level in \(ml/100g\)