4.6.1AtomArc7018(AWSE7018)- Although this electrodes is really of the mild steelcategory and classification, the mechanical
properties of the weld metal are sufficient to meetthe
similar properties of the 50,000 psi yield and 70,000 psi tensile strength steels.
Usually,preheat
and interpass temperature control of those steels is not necessary when welding
withAtom Arc
7018, although heavier thicknesses of steel may require some preheat. Commonapplications include: welding
carbon steels, high sulfur steels, enameling steels, and somelow alloy, high tensile steels.TypicalMechanicalPropertiesofWeldMetalAsWeldedStress-RelievedYield Point, psi68,50062,000Tensile Strength, psi75,00072,000% Elongation (2")3132% Reduction75.577Charpy
V-Notch Impact@72°F.125 ft.-lbs.130
ft.-lbs.@-20°F.70 ft.-lbs.75
ft.-lbs.TypicalChemicalCompositionofWeldMetalCMnSilicon0.06%1.10%0.50%4.6.2AtomArc7018Mo(AWSE7018-A1)- This electrode, which deposits 1/2%molybdenum weld metal, is useful in
welding power piping and pressure vessels ofmolybdenum
bearing steels designed for use at elevated temperatures. Typical applicationsinclude: welding of low carbon
and carbon-moly tubes and piping, forged alloy steel pipeflanges, fittings and valves for high
temperature service, carbon-moly steel boiler andsuperheater
tubes, manganese-moly and manganese-moly-nickel pressure vessel plates, highstrength structural steel and steel
castings for highway service.
