Just to clarify, did you snap the knife (some places call this the 'sickle assembly' or just 'sickle'), or snap the 'bar'? The knife is what moves back and forth with all the sections rivetted to it. The bar is the heavy piece the knife slides in that has all the guards bolted to it. The knife back (the flat bar with the rivet holes on it that's part of the knife) sounds like what snapped. Not uncommon, and certainly not impossible to weld. They generally break at a rivet hole. Ideally you have a donor bar or make a new knife back from a piece of good flat bar the right size and drill the rivet holes accordingly, such that you can make the weld between rivet holes.
That being said if Webb still offers new knife assemblies, I'd just get a complete new one. A new knife works wonders - especially when paired with new ledgers on the guards.
If you snapped the bar, that's a bigger problem Only think you could do there is have a new one made. Years ago on one of our All-Crop combines I had a new bar made. I drew it up in CAD and had it cut out of AR450 (abrasion-resistant, ultra-high-yield) plate at work. I made the guard holes and hold-down spacing to match the IH rather than Allis profiles, such that I could convert the whole thing to the more common IH-style bar/knife.
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