The extent of my knife making is limited to a couple of simple bench coil spring ones, lately I have made a couple of fire pokers with about 4inches bent over welded (electric arc) and re forged to form the handle.So here is a coil spring knife made similar,steel was preheated before welding.knife is not that great but I was interested to see if the thing would crack or fail during the process of forging, welding ,heat treatment so far all good..I do plan to put it to use in the back yard.