3 Best Grinders for Welding (2022 Update)

The best angle grinders for weldings run at over 10,000 RPM, over 6 Amps, 4.5 inch disc size, and are made from a reputable manufacturer.

Take a look at the market and you will find that there are plenty of grinders available. How do you know which one is best for welding?

The answer is not simple, as it depends on your needs and preferences. However, there are some grinders that we as welders use more often than others.

I will share with you the best three I use which come from my own experience.

Editor’s ChoiceBest OverallMost PowerfulBench Grinder Option
ProductCraftsman 7.5 Amp 4-1/2 inch Angle GrinderDeWalt 7-inch Angle GrinderDeWalt Bench Grinder
PreviewCraftsman Angle Grinderdewalt angle grinderdewalt bench grinder
Speed11,000 RPM8,000 RPM3,600 RPM
Amps7.5 Amps13.0 Amps4.4 Amps
FeaturesCast aluminum housing, quick-release grinder guardAdjustable keyless guard, sealed roller bearings, external brush doorMedium and coarse grinding wheels, adjustable eye shields
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Best Angle Grinders for Welders

Let’s see more in detail the three grinders mentioned above and how I use them.

1. Craftsman 7.5 Amp 4-1/2 inch Angle Grinder

Angle Grinder 7.5-Amp 4-1/2 inch with 2 Grinding Wheels, 2 Cutting Wheels, Flap Disc and Auxiliary Handle AVID POWER (Red)

I actually own two of these. I keep a grinding disc on one and a wire wheel on the other.

Whether you’re grinding slag from welds, shaping hunks of wood with a blade attachment or resurfacing cement, this Craftsman angle grinder brings speedy rotation and versatile muscle to the job.

With a maximum rotational speed of 11,000 RPMs, easy to use locking thumb switch and the protection of a quick-release grinder guard, this tool puts the power and easy use in your hands, while the ergonomic design and movable comfort grip handle provide hours of precision control.

The serious muscle that’s built to last, this 4 1/2 in. small angle grinder features the long life of heat-treated gears and power of 6 amps to get you through countless jobs. And since this grinder works with any standard 120-volt outlet, you’ll never have to worry about running out of batteries before the job is through.

A solid tool-built Craftsman tough and backed by a year-long warranty, this grinder puts power that you can count on in your hands. Cutting, grinding, or shaping, get it done with Craftsman.

  • Includes: Metal grinding wheel, spanner wrench, and soft grip handle
  • 6.0 Amp, – 11,000 RPM operation
  • Powerful motor handles heavy-duty applications
  • Cast aluminum gear housing
  • Quick release grinder guard can be located at various positions to wheel without special tools
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2. 7″ DeWalt Angle Grinder

DEWALT Angle Grinder Tool, 7-Inch, 13-Amp (DW840)

My 7″ DEWALT is quite old and has seen a world of abuse. It may look rough but it keeps doing its job!

The DEWALT 7-inch medium angle grinder is a compact yet powerful grinding tool offering 13.0 Amps of power at speeds of up to 8,000 RPM.

This heavy-duty tool features a rear-handle grip area for better control and comfort, an adjustable keyless guard that can be easily moved to your preferred position, and a spindle lock that makes changing wheels quick and easy.

Other features include sealed roller bearings to prevent debris from entering, external brush doors for easy access during servicing, and two-position side handles for optimal control.

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3. DeWalt 8″ Bench Grinder

This is a lighter-duty grinder that does not take up very much space. Mine works flawlessly.

DEWALT Bench Grinder, 8-Inch (DW758)
  • Medium and coarse grinding wheels
  • Large, adjustable eye shields and spark deflectors for safety
  • Adjustable tool rests
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Which Grinding disk should you choose for welding?

Which Grinding Disk Should you Choose for Welding?

There are a lot of choices when buying grinding disks but finding the right one can be a real nightmare. The wrong disk can ruin a great workpiece, burn through your spindle bearings in seconds, or just plain destroy your work area.

These are my favorites

1. Flap Grinding Discs

Flap grinding disks are perfect for welding applications where the parent material is too hard to grind on either side of the weld. They’re also great for confined spaces, overhead work, and removing weld splatter without over-grinding.

These discs are forgiving and allow you to blend into the parent material when necessary. And they come in 60 -grit or finer so you can avoid large gouges.

Benchmark Abrasives 4.5

2. Fiber Discs

Norton SG Blaze F980 Abrasive Disc, Fiber Backing, Ceramic Aluminum Oxide, 7/8" Arbor, 4-1/2

I love Norton Blaze F980. You can use these discs to grind stainless steel, inconel, and titanium without worrying about them wearing out too quickly or breaking apart. These discs are also designed with an anti-clog coating which helps prevent clogging during operation. And they come in a variety of sizes so there’s one for every job!

The self-lubricating ”supersize” treatment will help cut cooler and improve workpiece finish, while the ceramic aluminum oxide is self-sharpening and will allow for a faster cut than aluminum oxide.

3. Depressed Center Cut Wheel

Norton Abrasives - St. Gobain 43585 Gemini Fast Cut Aluminium Oxide Abrasive Type 27 Grinding Wheel, Depressed Center Wheel, Max 13,580 RPM, 5/8"-11 Hub, 4-1/2

If you have a project that requires aggressive weld removal, Depressed center wheels are the best choice for your application. They excel in this type of work by providing excellent cut-rate and product life. You’ll be able to get through your project quickly, with minimal downtime between cuts.

They also offer maximum safety because they don’t require special equipment or skills to properly use them.

4. Wire Wheel

3 Pieces 4 Inch Wire Wheel Brush Cup Brush Set, Coarse Crimped Twisted Knotted Cup Brush, 5/8 Inch-11 Threaded Arbor 0.002 Inch Carbon Steel for Angle Grinder, Heavy Cleaning Rust Stripping Abrasive

Different wires types are meant for different materials. Below I listed base metals and which type of wire is appropriate:

  • Metal – Carbon Steel, Brass or Nylon Wire.
  • Aluminum – Stainless Steel Wire, Brass, or Nylon.
  • Stainless steel – Stainless steel, Brass, or Nylon
  • Iron – Carbon Steel Wire, Brass or Nylon
  • Cover and Brass – Stainless steel, brass, and Nylon

These Wire cup, wheel and end brushes come with three options:

  1. Crimped Wire Brushes – Each single filament is only supported by the adjacent strand, allowing for increased mobility and adaptability in tight or inaccessible areas. 
  2. Standard Twist Knot Wire Brush – Flatwires are formed out of straight wires twisted together to form a more robust rope-like substance and used when we need higher impact.
  3. The Stringer Bead Twist Knot Wire Brush – The right tool for tough weld scale cleaning, removing beading that happens at the junction of two pipes or roots and hot-weld pass. Due to its high impact action and narrow face design, which provides greater surface area contact against surfaces while still being able to withstand extreme conditions such as heat generation from aluminum alloys heated up during processing, this type can also perform well in more aggressive brushing applications.
How is angle grinder used in Welding?

Welding has definitely changed since I first started learning it. I’ve seen tools come and go, but the one tool that has always been around is the angle grinder. It’s been around since power grinder was a bad word.
Automatic welding has changed the way we use our angle grinders. In the old days, they were used to rough and finish off parts and remove burrs. Now we mainly use them for cleaning and preparation before welding, and for removing the welded seam.

How long will a wire brush last?

The cheap ones work the same as the expensive ones. Now, if you go to a hardware store and get a cheap one from their parts department, don’t expect it to last very long at all. The brushes are in most cases poor quality so they will melt and break easily.

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