I would cut out the bad, cut it far enough away that the metal is up to full thickness, away from the rust.
Use a 4" grinder with a cut off wheel, make straight, square cuts. Polish away any surface rust or paint. Then make a cardboard pattern, transfer to the new piece of steel.
Turn the welder down low enough so not to blow through, clamp the piece in place and tack. Make any corrections on position, then start stitching it in. Go place to place to avoid heat distortion, playing connect the dots with the welds until it's all one weld. If it tries to burn through or there are wide gaps, you can use a back up piece of aluminum, brass, copper as a heat sink. The weld will puddle against it without sticking.
Then grind it down, fix any holes or low spots. I like to use the flap disc type grinding wheels. They are more expensive, but give a much better finish.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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