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January 16, 2026 3 min read
👉 The tool I use in my shop:
Intro paragraph...
Grinding MIG welds sucks.
Anyone who’s done bodywork knows it.
Not because it can’t be done, but because rushing it ruins panels. Most warped metal doesn’t come from welding. It comes from grinding too hard, too flat, or too long in one spot.
In the video above, I show exactly how I grind MIG welds smooth using a hard disc first, then a flap disc, while keeping control and avoiding warping.
No tricks. Just process.
Grinding problems usually come down to three things:
That combination builds heat fast, thins metal, and leaves you chasing waves later under filler and paint.
The goal isn’t speed.
The goal is removing material without losing control.
I always start with a hard disc. Not to finish the weld. Not to make it pretty. Just to knock the height down.
I run 40 or 60 grit, depending on how tall the bead is.
Lower grit cuts faster, which means pressure and angle matter more. Light pressure, shallow angle, short passes. Grind, stop, let it cool.
This is shaping, not attacking.
Once the weld is knocked down, I switch to a flap disc to smooth it out.
Again, I stay in the 40–60 grit range. I’m blending, not polishing.
Higher grits slow the cut and build heat. Cheap flap discs load up fast and make heat problems worse. Same rules apply here. Light pressure. Keep moving. Stop before the panel gets hot.
This is where patience pays off.
Grinding MIG welds isn’t just messy. It’s loud, throws sparks, and fills the air with fine metal dust.
If you’re doing this regularly, basic protective equipment isn’t optional.
Grinding wheels throw sparks and grit constantly. Disc failures and ricochets happen fast.
I wear safety glasses every time I grind. For heavier grinding, I add a face shield.
Eye damage is permanent. This is cheap insurance.
Angle grinders are brutally loud. You don’t notice hearing loss until it’s already done.
Grinding is one of the fastest ways to wreck your hearing over time.
Grinding throws fine metal dust into the air. You can’t see most of what you’re breathing.
I don’t grind without respiratory protection, especially on body panels.
Metal dust is a long-term problem, not a short-term one.
Gloves help with heat and sparks, but control still matters. I avoid anything loose that can catch a wheel.
Wear fitted clothing. Sparks don’t care.
When it’s done right, the weld is smooth, the panel stays straight, and you’re not fighting warping later.
Grinding MIG welds smooth isn’t the problem. Losing control is.
Grinding MIG welds already sucks. Permanent damage makes it worse.
Control the grind and the panel stays straight.
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This site documents real builds, tools, and shop work from my own projects. Some pages are showcases. Some are how-tos and tool reviews. If you’re working on a project and want experienced guidance, I offer one-on-one coaching.