Harris 410 description: This air hardening stainless steel electrode may be used to weld base metals of similar composition or to overlay carbon steel where there. may be a need for erosion, corrosion or abrasion resistance. Usually requires preheat and postheat to ensure ductility. 410-16 is a titania type coating for either alternating current (AC) or direct current (DC) reverse polarity. 410-15 is a lime type coating for use with direct current (DC) reverse polarity.