Orgasmic Farmer Posted March 19, 2007 Share Posted March 19, 2007 I am about to weld the thin sheet on the disco roof back together. I have already welded a filler below the join and have noticed that this has caused the natural curve of the roof to flatten out. If I was to weld the last piece in from below would that cause the metal to bend in the other direction (ie put the curve back in the roof). Just wondering as I had heard somewhere that it is possible to curve quite thick metal by running a continuous bead along it. Otherwise are there any hints as to how to weld the roof without it bending down any more? cheers Mark Quote Link to comment Share on other sites More sharing options...
dollythelw Posted March 19, 2007 Share Posted March 19, 2007 yes and no, playing distortion is used with heavy plate - but even then its not a science as plate will react in a unique way according to grain structure, temperature etc, the guy that tought us to weld (hallowed be George, RIP) used to tell tales of chucking buckets of water on hull claddings and strategic peeing to bring things into line (he spent years building submarine hulls) but with bodywork you are going to well up against it. if you want supersmooth lovelyness you've got a couple of options - either low-amp tig the whole thing and use a backstep approach or tap it back into shape, make a jig to hold the arc of the roof panel, tack that on, then weld short sections quickly and alternately, allowing time to cool - when you have finished cut the jig off. If the panel isn structural then dont weld it fully - fill the rest. hitting the other side will pull it back to a degree but you are going to have a fight on your hands Quote Link to comment Share on other sites More sharing options...
Orgasmic Farmer Posted March 19, 2007 Author Share Posted March 19, 2007 Thanks for that Dollythew. I will go and have a go and report back on the outcome. Cheers Mark Quote Link to comment Share on other sites More sharing options...
Les Henson Posted March 19, 2007 Share Posted March 19, 2007 Welding flat, or almost flat sheet steel is a nightmare, and not something us gas welders like at all. Formers, multiple clamps, exploitation of heat distortion, sudden soaking, are a major headache. Les. Quote Link to comment Share on other sites More sharing options...
Mark90 Posted March 19, 2007 Share Posted March 19, 2007 Sikaflex? Quote Link to comment Share on other sites More sharing options...
Daan Posted March 19, 2007 Share Posted March 19, 2007 I would suggest use joggle pliers, and puddleweld on several spots. Filler up and sand it smooth. its what most bodyshops do, for a good reason. Quote Link to comment Share on other sites More sharing options...
Guest WALFY Posted March 19, 2007 Share Posted March 19, 2007 A mate who had some work done on his RRC bobtail had his rear panel glued together. The bloke who did it used an acrylic adhesive. I can't remember the name of the company, when I called them direct I was asked to send in my request by fax and they'd deal withit. As I don't have fax I gave up and am still looking for a source. Poor representitive diagram Sorry =============== ===================== ================================ ======+++++++++++++++++++============ =========================================== ------------------------------ --------------------------------------- -------------- Panels placed end to end ++++++++ Waste from pop rivets or small rods 2-3mm in dia ======== Acrylic adhesive HTH This is a VERY strong repair. Quote Link to comment Share on other sites More sharing options...
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