Cold Forming Sheet Metal With A Hammer

For this example we will hammer form some tank end caps.
Cold forming sheet metal with a hammer. The cold hammer forged marking chf is stamped into millions of rifle barrels around the world. This involves forming a feathering by hammering the edges of the sheet to about half their original thickness and then cutting slits at right angles to the edge. Move the metal around to get a smooth bowl shape. This takes patience and can be meditative.
You want to put your metal over the dent and hammer it with the ball end of the ball peen hammer. These are bent out alternately and mated with the edge to be joined. Hammer forming is one of the oldest simplest and least expensive ways to shape sheet metal.