Had a bed stabilizer on a grain truck we bought that was froze up, couldn't even begin to get enough heat on it with both torches and the rosebuds so I built a forge.
Took the bottom 1/3 of a 55 gallon drum, cut several 3/4" holes in the bottom in a row, then tacked a small piece of pipe to the bottom of the drum with 1/16" holes drilled in it to line up with the 3/4" holes. Sat the drum on several bricks. Set old bricks inside on opposite sides as the piece I needed to heat was 4 inches wide but just sat in the drum hanging from the loader, dumped one small bag of charcoal in the bottom and lit, once it was going I dumped another one in then sat the stabilizer in the drum, and filled around it with charcoal then put about 30 pounds of compressed air on the pipe with the holes, redneck forge. Worked very well actually for using nothing but scrap and having a tops of 20 minutes in throwing it together.