This may be the stupidest DIY question ever, but I want to make sure before I return it: is this non-ferrous metals saw blade faulty?
In the picture, see where one of the titanium carbide teeth seems to be too large and to extend into the expansion slot. BTW, I had made 4 cuts of 9-15" or so, in 3/16 aluminum plate, before I noticed this; it cuts OK and seems like it could have been smoother, but I've never cut aluminum with a power saw before, so I don't really know what to expect.
Here is the blade:
https://www.amazon.com/gp/product/B00LFCMI34/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
… and the picture of mine:
Best Answer
The filling is melted aluminum that galled/melted and filled the gullet and is covering one of the Tungsten Carbide teeth. You can pull it off with a pliers.
The negative rake angle of the blade is fine for cutting aluminum, it will push your workpiece away instead of tending to grab onto it. It will generate more heat and be more likely to melt the aluminum. You can feed the work harder to generate a thicker chip to carry the heat instead of rubbing/melting it off.
A little spray of WD40 on your path can help immensely.
The J Shape is supposed to be there.