This specification covers austenitic steel arc welding electrodes for use on steels of high hardenability (see 6.1). Intended Use: This specification is military unique because it covers austenitic welding electrodes for the welding of steels of high hardenability such as those used for armor applications. Chromium-nickel electrodes for the welding of corrosion and heat resisting steels are covered by MIL-E-22200/2. The MIL-307 and MIL-308 types of electrodes are commonly designated as 19-9 Mn and 19-9 Mo, respectively. Unit containers should bear a printed label in a conspicuous location, on or near the manufacturers label and on any special instructions which may be enclosed. As a minimum the warning label should contain the following: CAUTION: Welding may produce fumes and gases hazardous to health. Avoid breathing these fumes and gases. Use adequate ventilation. See AWS Z49.1, Safety in Welding and Cutting.