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A stick welding rod rarely restarts cleanly by accident. When the arc breaks, the electrode tip is covered with slag and the crater in the weld is usually cold, dirty, or both. Striking directly on that spot often produces a sticking rod, a weak restart, or a visible crater crack. The fix is simple: remove the coating from the tip, clean the weld area, strike just ahead of the crater, then work back into it.
Why stick welding arcs break
An arc can stop because the rod touches the work, the electrode angle changes, the stinger connection is loose, or the welder’s duty cycle has been exceeded. Long arc length can also make the arc unstable. With small-diameter rods, especially 3/32-inch electrodes, the tip heats quickly and the flux coating can crumble during a restart.
The weld crater matters as much as the electrode. If you stop suddenly, the crater is a small depression filled with hot, shrinking metal. Restarting at its center can trap slag or leave a lack-of-fusion defect. On a structural or pressure-related weld, an improperly restarted bead can be a serious failure point.
Prepare the rod and work safely
Keep the electrode holder pointed away from your body and make sure the machine is set to the correct polarity and amperage. Wear a properly shaded welding helmet, gloves, flame-resistant clothing, and boots. If you need to chip slag close to your face, use safety glasses under the hood.
Before restriking, knock the slag off the end of the rod. A light tap against a clean piece of steel usually breaks away the glassy coating. If the flux remains over the tip, the arc may not start at all. Do not grind away a long section of coating; exposing roughly 1/8 inch of clean core wire is enough. A welding chipping hammer and wire brush are inexpensive and faster than trying to restart with a contaminated tip.
Brush the crater and the last 1 to 2 inches of bead. Remove loose slag, paint, rust, and oil. If the weld has cooled enough to touch, inspect it for a crack before continuing. Never weld over trapped slag just to save a few seconds.
How to restrike the arc
Position the rod at the same travel angle used for the bead, usually about 10 to 15 degrees from vertical in the direction of travel. Hold a short arc, approximately equal to the diameter of the electrode core. For a 1/8-inch rod, that means an arc around 1/8 inch long. A long arc increases spatter and porosity; an arc that is too short makes the rod stick.
- Strike the rod on clean metal just ahead of the crater, using a quick scratch or tap motion.
- Establish a stable arc for a fraction of a second.
- Move backward into the existing bead and pause over the crater.
- Continue forward at the normal travel speed once the crater is filled.
The backward movement is the key step. Starting slightly ahead gives the arc clean steel to ignite on, while moving back remelts the toe of the old bead. Pause only long enough to fill the depression; lingering too long creates a lump or excessive penetration. For a fillet weld, keep the rod centered so the restart does not wash one leg more than the other.
If the crater is wide or the bead has already cooled, overlap the previous weld by about 1/2 inch. On a multi-pass joint, grind or chip the restart area flat if it contains a high spot, slag pocket, or visible crack before depositing the next pass.
Adjust the restart to the rod
Different electrodes respond differently to arc breaks. The table below gives practical starting points, but the amperage printed on the electrode package takes priority.
| Electrode | Typical current range | Restart behavior | Useful adjustment |
|---|---|---|---|
| 6010 or 6011, 1/8 inch | 75–125 amps | Usually restrikes easily but can leave a rough crater | Use a short arc and dig back into the crater briefly |
| 6013, 1/8 inch | 90–130 amps | Easy to run, but slag can cover the tip | Clean the tip carefully and avoid a long arc |
| 7018, 1/8 inch | 90–130 amps | Can stick during a cold restart; moisture is a concern | Use a clean tip, clean steel, and a firm scratch |
| 3/32-inch general-purpose rod | 60–100 amps | Starts easily but overheats quickly | Use shorter weld sections and do not hold the arc after the crater fills |
These ranges are broad because joint fit-up, material thickness, machine characteristics, and welding position all affect the correct setting. If the rod sticks repeatedly, increase amperage in 5- to 10-amp steps or improve the striking motion. If the restart blows through thin material, lower the amperage and move sooner.
Fix common restart failures
The rod sticks immediately: The tip is still flux-covered, the amperage is too low, or the arc is being held too short. Break the rod free by twisting the holder, then clean the tip and try again on bare metal. Do not yank hard enough to disturb the hot weld.
The arc starts but goes out: The tip may be dragging through slag, the work clamp may be poorly connected, or the rod angle may be changing. Move the ground clamp to clean metal and check that the electrode is dry and firmly held.
The restart leaves a lump: You paused too long or started directly in the crater. Grind the lump down if it interferes with the next pass, then restart ahead of it and travel through smoothly.
A pinhole or slag line appears: The area was not cleaned, the rod had absorbed moisture, or the arc was too long. Low-hydrogen 7018 electrodes require more careful storage than ordinary 6011 or 6013 rods. For occasional repair work, buying a small sealed pack is often more practical than buying a rod oven. For frequent structural welding, a welding rod oven can reduce moisture problems.
Equipment that makes restarts easier
A welder with adjustable hot-start and arc-force controls can make restriking less frustrating. Hot start briefly increases current at ignition, while arc force adds current when the rod gets close to the work. These features are useful with 7018 rods and in awkward positions, but they do not replace cleaning or correct technique.
For basic repairs, a modest inverter stick welder, a sound work clamp, and a good auto-darkening welding helmet are sufficient. The cheapest helmet is not the best place to save if its delay, viewing area, or optical quality makes you hesitate before striking. On the other hand, expensive arc controls are unnecessary for occasional farm, shop, or hobby welding when the operator can clean the joint and restart correctly.
Practice on scrap by intentionally stopping every few inches. Let each crater cool, chip it clean, and restart ahead of it. After a few repetitions, the motion becomes automatic: clean the tip, strike on fresh metal, back into the crater, fill it, and continue.