Weld Seam Removal: Grinding Disc vs. Fibre Disc vs. SMT Flap Disc | KLINGSPOR Abrasives USA

Weld removal is an application that gives you choices. Often it's just a matter of preference, however, there are advantages to all three, flap disc, fibre disc and grinding disc.

Grinding Discs are the most aggressive and remove lots and lots of material in a short period of time. However, they are usually very loud, vibrate a lot and leave plenty of spots and marks around the weld.

Fibre Discs are the intermediate product. They are not quite as aggressive, but still fast when removing weld seams and leave a nicer surface that needs less clean up.
Be aware though that the grinding area is somewhat wider.

Our personal winner for weld removal are flap discs. Fast, efficient and producing a nicer surface quality. Having the choice between angled and flat version gives you perfect control about the grinding width. They also have the longest service life.

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[bottmar]

Like another replyer stated. I use a grinding disc first to get the majority of the weld level then use the flap disc to get the best fish, since the flap disc wears out sooner and costs much more. MUCH MORE.

[apollokovacs]

I work welding production guard rails I usually go through 2 fiber discs a day. Or 5 medium rails. The edge does wear down faster but just grab another and sand down the worn area and bam new edge (wear breathing protection).

Also I have a 4 1/2 backing and a smaller one so that I get the most of the sanding disc.

I also don’t use a guard as grinding flat helps the overall wear of the disc.
Regular grinding wheel gauges the base metal too much and can’t fines the details.

[alviearmstrong]

Great video. Nice and short to send to customers with good info that gets asked often

[Kozk]

A little note: use the fibre disc and the flap disc horizontally - not "pointy" like with the standard grinding disc.

[freakyflow]

Knowing your grits of sandpaper helps too 24 grit means 24 pieces of grain per square inch 40grit 80grit 120grit ..24 i would use on thick welds were the job does not have to be super pretty ( Construction equipment field repair etc)
40 grit Would be prepping the area knocking down the finer weld Rust, Bigger grind marks. Maybe some edging on corner welds
80 grit Getting into alum welds taking out scratches from 40 "feather edging" groves, Knocking down sheet metal welds
120 grit You would be getting into prep work for painting metals And having flush metals And this would still be outside the automotive standard of Priming (180-320grit)
I tend to use the grinder at a flatter angle And allow a cool down after 30 secs or more to check my work And wear on the disk
Thanks for the video !

[fixedit]

Use the hard disc first then finish with the flap.

[bajadan]

Is Dave still selling for you guys in San Diego ?

[johngranato]

The problem comes when you are sanding / grinding auto-body panels. When doing so, you don't want to heat-warp the piece and you don't want to gouge the panels.

[NoferTrunions]

Has grinding disc advanced over the years? Been using grinding discs since 1970 and they always "clogged" up and didn't want to cut. A decade or so ago, I tried flap discs and I've never looked back. Now I just tried the ceramic alum oxide and it insane how they cut w/light pressure. WHAT am I missing?

[WelderSkills.]

If he would have held that hard disc flatter there would have been less gouge marks

[anelpasic]

Never liked flap discs much, too slow for my taste and not that versatile for some hard to reach grinding applications. A regular grinding disc is still my go-to.
Haven't tried the fibre disc, but it looks like the edge gets worn too fast and the backing plate soon follows, kind of like those velcro backed discs used with sanding pads.

[TheHateSpeechChannel]

The beard line was a little high to be honest.

[griptopia]

I'm a Metal Finisher, and finally someone is teaching these nit-twit welders how to remove just the weld and not leave massive grind marks for me. :) big love OH NO OH NO I spoke to soon you guys are waving that thing around like a cowboy workman, it is possible to use a grinder as a semi precision tool. You guys clearly sell this stuff as opposed to using it every day. SORRY BUT YOUR DEMO SUCKS!!