I am not a weldsnob please but in this case you will be going worse than backwards if you use the wrong/cheap rod, crushing rock is my trade OK. First thing is you need to KNOW what that jaw die is made of. Most will be a manganese alloy and assuming that is what your antique jaw die is cast from we used to use a rod called BU90, pretty sure that is a Lincoln number but we have not used sticks for this work for 30 years, all wire feed now. Any rod supplier should be able to supply a build up rod for manganese. Your going to need a DC welder and DO NOT use hardface rod no matter what anyone tells you as it will quickly spall and begin to chunk off the die.
On to safety, I assume this is going to be a show piece? I witnessed a child come very close to getting killed at a show where they were demo"ing an old jaw like that when it spit a grapefruit sized round rock 50" in the air and landed at the child"s feet, if your going to operate it where people can be hit by debri 1.Install a thick steel plate over the top of the jaw that is exactly 90 degrees from the opening 2. dont let anyone stand where they could get hit by deflected pieces. 3. Do not crush round gravel, river rock, field stones, (blank) heads or whatever your local terminology is. Limestone fragments are safest. Off my stool, sorry.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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