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A5.20: E71T-11 DC- Innershield® NR-211-MP is a versatile wire suitable for all-position welding of light gauge or thin plate. It is recommended for maximum plate thicknesses in the 7.9mm to 12.7mm range. For an easy-to-use general fabrication wire - choose Innershield® NR-211-MP.
Straight answers on choosing, setting up and troubleshooting self-shielded gasless flux-cored wire.
Most gasless wire runs on electrode negative, also called straight polarity. On many machines the polarity is changed inside the case near the drive rolls by swapping the lead from one terminal to the other, so it is worth checking the machine manual.Some wires are made for the opposite polarity, so always follow the wire maker's recommendation on the reel or data sheet. Running the wrong polarity gives a harsh, spattery arc, poor bead shape and unreliable results.
Yes, this is one of its main strengths. Because the shielding gas is made inside the weld pool by the flux, a breeze cannot blow it away the way it can with gas-shielded MIG. That makes it popular for site repairs, farm and fencing work, and fabrication outdoors.Very strong wind can still disturb the arc and spread slag and spatter, so shelter the weld where practical. Keep the arc length steady and clean the joint well, because outdoor jobs are often dirty.
Stickout is the length of wire between the contact tip and the work. Gasless wire normally runs with a longer stickout than solid MIG wire; around twice as long is a common rule of thumb. A longer stickout preheats the wire and keeps the flux working properly.Too long a stickout causes porosity, an unstable arc and burnback to the tip, while too short gives excessive spatter and overheats the tip. Follow the wire's data sheet for the right range and adjust in small steps.
Flux-cored wire is a soft tube, so it can be squashed by too much pressure. Knurled (grooved) drive rolls grip it well without crushing it, whereas the smooth V-groove rolls used for solid steel wire may slip.Set the drive roll tension just high enough to feed the wire without slipping, as set out in the machine manual. A crushed or flattened wire shows as erratic feeding and a rough arc. Match the roll groove to the wire diameter.
