My cousin has a good sized farm equipment servicing shop. When ever we
do heavy steel bending and fabrication we use torches to heat the metal
at the bend points. With a little practice, you get pretty good at
this. This works on single plane curves.
Compound curves, like those of a plow share, are almost impossible to
create well. For things like that we usually build it up with welds and
grind to shape.
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