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Message: <blockquote data-quote="BrazosDon" data-source="post: 264048" data-attributes="member: 7752"><p>Flat Bottom, is the thickness of the metal that you're welding in the same thickness that the boat is made of?  If not, there will be a deferential distribution of heat between the two pieces of metal causing the metal to warp the thinner metal.  Also, you might be welding in one area too long so the metal can't cool sufficiently as you weld.  Remember heat range and speed.  The trick there is to weld about an inch then go to another spot(maybe on the opposite side) and do the same thing and keep doing that until the welding is done.  Also practice on some pieces before you start on the main project.  Practice makes perfect</p></blockquote><p></p>