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Hi Dave, To repair the gears in the manner you described they would need to be annealed(un-heat treated), welded, re-heat treated, tempered, then re-ground. And when the process was complete you would have a gear that wasn't as good as new. But anything less than this is a guarantee the gears will break right next to where they were welded. If they are available, either good used parts, or replacements from the manufacturer, are your cheapest alternatives. The third choice is to have new ones made. The general availability of modern gear cutting/grinding equipment now makes this a possible/practical option. Although the process is not cheap, neither is it unaffordable. I have had splines, gears, and sprockets made for various projects. Any large industrial city will likely have at least one shop offering these services. If you decide to go this route the shop will need either some precision measurements from your piece of equipment, or the disassembled gear housing unit. Good luck...Al English
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