I was taught by the old Tool Makers when i got in the trades many moons ago. When welding a saw blade to anneal the blade after weld buy bumping the anneal button till it just starts to turn blue. Then use a file on the weld. There is not a lot that has to be removed and a file doesn't heat up the area like a power grinder does. After you file the weld do a second annealing. i have the best luck with this method.