Why has no one ever mentioned Pferd grinding wheels? Options

[mbseto]

I've been grinding welds with the aluminum oxide wheels I get in a bulk pack from HF and always dread doing it. It's slow and it's a drudgery. A buddy showed me one of these wheels and it is amazing by comparison. Knocks the welds down extremely fast and runs cool - no discoloration in the metal. Is anyone else using these?

[tygaboy]

The biggest difference I've found is moving to high quality abrasives. 3M Cubitron made all the difference over the HF-level stuff.
And I've used those wheels but found they didn't offer me the level of control I wanted.

I follow this process:
- 3 inch air angle grinder w/ Roloc backer pad
- 3M Cubitron abrasives
- Start w/36 grit, use a steep angle and cut only weld material. Go SLOWLY. I used a "long-ish blip, blip" to keep accurate control over the cutting. Once "close" to the parent material:
- Switch to 80 grit. Shallower angle, same go SLOW approach.
- Once the edge of the weld starts to show a blend with the parent material:
- Switch to 80 grit on a DA to do final blending.

The 3M stuff cuts so quickly, I have yet to experience heat-related distortion.
Pics of a recent repair using the above approach. Hope this helps.

Also, a while back @McMark posted a vid of his technique when doing sheet metal repair. Maybe he'll point us at it...