Grinding and Blending a Weld with 3M Abrasives

In this demo, see the 2-step weld removal and paint prep process using a 3M™ Cubitron™ II Flap Disc 969F and a Scotch-Brite™ Light Grinding and Blending Disc. Learn the differences between various flap discs and why they are so important to have in your shop.
The first step is to remove the welds with a 60-grit flap disc. While a fiber disc will remove welds more quickly, they also have a higher chance of damaging the part - especially on thin-gauge steel like what we’re using here. Whether you use a type 29 or type 27 flap disc for this application depends on personal preference and your desired finish. A type 27 flap disc grinds with more force, and type 29 tends to leave a finer finish.
In the second step, the Scotch-Brite™ Light Grinding and Blending Disc refines and blends the scratch left by the flap disc to get the steel part ready for paint. Since the flap disc leaves behind some discoloration and scratches, it’s crucial to perform this second step before applying paint.
Products featured in this video:
3M™ Cubitron™ II Flap Disc 969F (Type 29 and Type 27) - www.3m.com/3M/...
Scotch-Brite™ Light Grinding and Blending Disc - www.3m.com/3M/...
TJ is an employee of 3M Abrasive Systems.
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[@ToddAndelin]

I had no idea flap disks had differing angles like that... Thanks for the video!

[@thisisconstruction.]

I love flap discs.. I use them for copeing crown molding.. I’m a carpenter.. they give such a nice finish on wood as well!!!!!!!!

[@dweidemann]

Thanks for showing this, good info. Speaking of inexperienced operators, whose hyperactive 8 year old was recording during your grinding?

[@bamideleakinte8706]

Thank you for the video TJ. I occupy the position of a Product Business Manager and the company i work for (GIBADI) we are a representative of 3M in Nigeria Africa. I need more technical details about the abrasives like why 3M abrasives is better compare to others brands.

[@stizolac]

I'm curious about your fiber disc and backer plate...i assume they are 3m. Do you have model#s so I can order? What grit did you use?

[@3MAbrasives]

The flap discs used in this video are 60 grit. When grinding welds with a fibre disc, use a 36+ or 60+ grit disc paired with an extra hard ribbed face plate: www.3m.com/3M/en_US/company-us/all-3m-products/~/3M-Disc-Pad-Face-Plate-Ribbed/?N=5002385+3293241044&preselect=3293786499&rt=rud Our fibre disc recommendation is 3M™ Cubitron™ II Fibre Disc 982C: www.3m.com/3M/en_US/company-us/all-3m-products/~/3M-Cubitron-II-Fibre-Disc-982C/?N=5002385+3293241512&rt=rud