One could also use an old band saw blade for cutting steel by cutting the length to approximately 6 to v8 inches in length and wrapping one end of it with either electrical tape or after doing so, dipping it also in that liquid grip stuff that's used by some folks to apply on their manual tools in order to handle them better if one really wants to get fancy with their own personal use...
Make sure the teeth on the piece of the blade is facing in a direction where one can easily use it to scrape any of entrapped slag out from usually the toes of the weld as well as some other locations where the weld has been deposited. ;)
One can use both coarse as well as fine sized teeth blades (More TPI in smaller toothed blades) as part of their own personal inventory of personal manual scraping tools custom made just for this type of work!!! :) :) :)
Respectfully,
Henry