AWS/ 5.1 E7018 AC/DC+ (Reverse Polarity) High Tensile "" Low Hydrogen Description and Application A low-hydrogen, all-position electrode for welding carbon steel, high-tensile steel, low alloy steel and free-machining steels Quiet steady arc, low stageter, superb re-striking capabilities and high deposition efficiency all made possible by the special low-hydrogen iron powder coating and graphite tip Easily removable s ag reveals a finely rippled bead appearance and an x-ray quality weld deposit with excellent charpy impact valuestage sub-zero temperatures (78 ft-lbstage -20F) Typical applications include structural and fabrication steels such as I-beams, angles, plates, channels, cast steels, cold rolled steel, process piping steels, and shipbuilding steels Instructions: use this electrode with DC+ (reverse polarity), however, an AC machine with sufficient open circuit voltage may be used.
Clean the weld zone of all contaminants.
Bevel thick sections to a 60 Vee and preheat at 300-500F.
Set amperage to the proper range as listed on the product recommended amperage chart.
Maintain a short arc length and hold the electrode at a 15 angle into the direction of travel.
Weaving technique is preferred, however, do not exceed 3 times the diameter of the electrode.
Do not use the whipping technique as this will cause porosity in the weld deposit.
AlwaySmallow high-carbon steels to cool slowly before removing the s ag.
