I did temper the whole blade with the idea that it may prevent any future cracking or breaking of the saw blade. I did put some raw potatoes on then cutter teeth to preserve their hardness. The cutters do hold there edge very well. The tempering heat was not hot enough to warp the blade but should make it a little more ductile. I have cut about five cords of firewood with the saw after is was welded with the original weld holding up well.