This specification is intended to cover low alloy steel solid bare welding electrodes and rods and alloy cored bare welding electrodes for depositing weld metal, that, in the as-welded condition, meets the mechanical properties specified herein when welded on the applicable base metals as specified in table X using GMAW, GTAW, and SAW processes. This specification also is intended to cover low alloy steel solid bare welding electrodes and rods for depositing weld metal, that in the stress-relieved condition meets the mechanical properties specified herein when welded on the applicable base metals as specified in table X using either SAW welding processes employing a suitable neutral granular flux or GMAW and GTAW processes with a suitable shielding gas. Types MIL-100S-1, MIL-100S-2, MIL-120S-1 and MIL-120S-2 or MIL-100S-1F, MIL-100S-2F, MIL-120S-1F and MIL-120S-2F, are intended only for as-welded applications. If they are conformance tested in the stress-relief condition and bear the SR suffix, they may be used for stress-relief applications as well.

Type MIL-80S-1 and MIL-80S-2 electrodes are suitable for welding MIL-S-23194, composition A steels; MIL-S-24238, composition A steels; ASTM A 508, class 2 or 3 steels; and ASTM A 533 or ASTM A 302 steels using the SAW process. Type MIL-80S-3 is suitable for welding the same steels using the GMAW and GTAW processes.

Type MIL-100S-1 electrode is suitable for welding HY-80 steel.

Type MIL-100S-2 electrode is suitable for welding HY-80 steel, especially for approved reduced preheat applications.

Type MIL-120S-1 electrode is suitable for welding HY-100 steel.

Type MIL-120S-2 electrode is suitable for welding HY-100 steel.

MIL-100S-1F, MIL-100S-2F, MIL-120S-1F and MIL-120S-2F are the designations of neutral granular flux to be used with the corresponding type of electrode.

Restricted copper electrodes and rods will be used when specified (see 6.2 and table I).

MIL-120S-1X and MIL-120S-2X electrodes are suitable for welding HY-100 steel with the SAW process using ac current only.

Alloy cored electrodes are intended for use with the GMAW and SAW processes only.

MIL-100S and MIL-120S types with higher carbon content are intended for use with SAW only.

For MIL-120S type electrodes with the SAW process and all alloy cored electrodes with the SAW process, only those electrode and flux combinations approved are listed on the QPL.