You strike the arc and nothing happens. You clamp the ground and the electrode sticks. Tap the rod down again and it’s stuck tighter then ever. Every stick welder knows what that’s like.
Because one dial on the front of the panel are frequently neglected until failure presents itself. Machine settings aren’t suggestions. They’re what decide the success or failure of the bead. But knowing those settings isn’t so much memorizing a chart as it is comprehending the path heat follow in metal.
How to Set Your Welder
The amperage dial isn’t a volume knob. New welders often spin it until the metal turns to slag but that’s hardly ever appropriate. Below is a chart describing what current windows should be for popular electrodes. Note: A one-eighth-inch rod won’t last an entire day at every setting.
An E6010 rod, which is famous for deep penetration in pipe roots, runs hotter and demands more precise control than a E7018 rod used for structural steel. Pushing the amperage to max to get thickness of plate is going to trip the thermal breaker in under two minutes if you’re using a sixty percent duty cycle machine. That’s not because the weld won’t hold; it’s because you’re pitting against the machine’s limits.
You want to set it to the point where you hear the sound of frying bacon, not the whisper of quiet air or the explosion of a rocket blast off.
The other half of the equation, which most hobbyists will neglect, is polarity. A large majority of the heat in Direct Current Electrode Positive (DCEP) go straight to the electrode. That makes for a deeper dig, which is necessary when trying to open up tight roots.
Direct Current Electrode Negative (DCEN) relocates the heat to the workpiece. If you’re working with something really thin and don’t want to burn right through, this is preferrable.
Alternating Current bounces back and forth between positive and negative to counteract the magnetic arc blow. When welding on rusty stuff or around edges where you can get puddle to move away from what you’re wanting, this keeps it from happening. It is a small change but it completely changes how the weld turns out.
Before you ever turn the key, read what polarity they recommend on rod package. That’s where the theory hits the floor, specifically with arc length and travel speed. The longer the arc the more porosity and spatter. Your nice clean weld becomes a glob of melted metal balls stuck to each other. The golden rule is keep the arc length about as long as the diameter of welding rod.
That means having a good look at what we call the puddle and having a steady hand. That’s why you will want to wear shade twelve lens on a bright day. It may feel like you’re driving around in sunglasses, but you gotta be able to see that molten pool to know whether you are going too slow or going too fast. Too fast and you’ll get under cutting, too slow and you’ll have too much build up and distortion.
Storing electrodes is much more important than folks give it credit for. A wet garage will cause your E7018’s to pop and spatter. Your beads won’t look good and may even crack along the way when welding. Even if they’re stored in a rod saver, or even better yet kept in a small warm oven at a constant temperature, it doesn’t matter if you want good looking repeatable results, this ain’t just for pros.
Once those coatings dry out then your arc is stable and what you dialed-in does what you wanted it to do. It’s a conversation between the material, the machine and you. You adjust the amps and you see what happens. Then you pull back. And you go again. You watch that puddle and adjust those amps. You feel that drag. You learn how to listen for feedback from the metal.
There is no magic number you find and set in stone. That’s not it at all. The weld is made paying attention to the process, it happens one inch at a time.
