welding AR500

[Shield Arc]

Correct... and the 500 is the hardness rating (Brinell). Very hard stuff. I believe originally developed for the mining industry, mainly the ore chute liners. Makes good but heavy armor too. Not as fun to weld to weld from what I understand, at least this is what my customers tell me.

Seems as I remember the welders in the Navy yard telling me they use a lot of HY-80 for armor plating.