Shipbuilding, bridges, heavy construction work, cast steels, low alloy, high tensile steels, pressure vessels, truck chassis, high carbon steels, sulfur bearing steels, welds which are subjected to x-ray inspection, etc.

Use either DC+ or AC. With AC current, the open circuit or terminal voltage of the machine should not be less than 80 volts for best results. Use as much current as the nature of the work permits, maintaining a short arc. Fill all the craters to avoid crater cracking. To prevent porosity, carefully the rules and precautions to be observed in welding with low hydrogen electrodes. Use only absolutely dry electrodes. If necessary, redry electrodes at 250 degrees celsius for 2 hours before use.