There's a reason they call it black malleable iron. It's designed to give rather than resist and possibly rupture when impacted. Terrible choice for structural work. That's not to say it isn't possible to be made to work if designed well enough, but there are far better options.
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01-22-2014, 01:14 AM #19Syncrowave 250DX
XR Control and 30A
Airco MED20 feeder
Thermal Dynamics Cutmaster 81
Smith O/A rig
And more machinery than you can shake a 7018 rod at