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My thanks to everyone who took the time to respond. Before I go any farther, I should clarify what I'm doing. I have built a guillotine tool to be used in blacksmithing. Initially, I made my cut-off tool using the A36, but even when cutting hot steel, the edge did not hold up. Following this attempt, I decided that some harder steel was needed for the cutting edge. I have a good supply of HSS tool steel, and thought that would be a good choice since by definition, it holds up well under heat. As mentioned, my welding skills are less than adequate, so I asked for the help since I didn't know about welding the tool steel to the A36. I am not concerned with the tool coming apart or fracturing during use since it is not going to be used on a lathe, but I'd rather it simply stay together after it is once welded. It will be subjected to impact, although I am hoping that even the hammering will not be too extreme. Cutting hot steel is not normally that difficult, but it is simply more than the A36 edge could take. I believe the tool steel will hold up just fine, and I think I'm going to give it a try and see what happens.
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