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Sounds to me like it's too cool. I weld at 2300F, which to me is yellow. 20 Mule Team will start bubbling around 1900F, so you want it a bit warmer than that; when it's right it will be bubbling vigorously. Personally, I'd say 2000F minimum. When you get your conditions right, it'll weld without problem as long as you are in a reducing atmosphere. You should have a fuel-rich environment to keep the oxygen out. This is usually known by the fact that orangish flames are exiting the forge. Don't beat the crap out of it when welding. All you're trying to do is make sure the two faces of metal come in good contact. Overhammering causes it to slide on itself and it won't stick.
Hope this helps a bit.
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