Weld Seam Removal: Grinding Disc vs. Fibre Disc vs. SMT Flap Disc | KLINGSPOR Abrasives USA
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- Опубликовано: 4 янв 2022
- 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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A little note: use the fibre disc and the flap disc horizontally - not "pointy" like with the standard grinding disc.
i was going to say that ! LOL
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.
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 !
Great video. Nice and short to send to customers with good info that gets asked often
Good Job Guys!!
Thank you !!!
Is Dave still selling for you guys in San Diego ?
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.
So what’s best? Haven’t watched the video yet. Looking to buy some stuff for my die grinder
Use the hard disc first then finish with the flap.
What grid was the flap disc
Right id imagine the grit of the fiber and flap makes all the difference on the finish
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?
Same thing here with the grinding vs flap discs. Flap discs work 1000x better and faster for me especially when grinding flat. I really only use the grinding disc to gouge or get in corners
A lot has changed over the years. Example i had a electric grinder in the 80's with 1 speed The discs never really changed since the 70's The higher the speed The quicker they would gum up And clog Looking back it was the high heat And the glue they used to hold the grit in place It would last about 30mins to 1 hour of use. before you really had to push down on them Before throwing the grinder across the shop lol ...I think in the 70's aluminum oxide was king And heading towards the 90's? Zirconia with the longer lifespan And designed for heavy duty metal work Left Alum/ox for lighter duties And cheaper prices for wood and metal
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.
Flap disc are good for smooth material that you want a nice finish after. Unfortunately flap discs wear out way too fast.
The beard line was a little high to be honest.
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!!
They still don't have that fiber disc down. I use those every day and work and I can give the metal a near finish using an 80 grit disc