ER80S-D2 (GMAW) description: 80S-D2 contains molybdenum for increased strength and manganese and silicon as a de-oxidizer helping to control porosity when welding with CO2. The weld deposit yields excellent quality and bead appearance on carbon and low-alloy steels; also may be used for out-of position with short circuiting and pulsed arc process. Use with a preheat and interpass temperature of 275°f minimum.