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Old 02-06-2011, 09:34 PM
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tips and tricks for welding motorcycle frames

I'm looking for more knowledge and tips on welding motorcycle frames.
One tip i was given was to sleeve the inside of the tube with another tube tightly fitting as opposed to just butt welding, if for instance i were to want to stretch a frame. I'm looking for tips like this or any experiences anyone has had. I'm currently taking welding classes and practicing plenty.
Thanks, Hern
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Old 02-07-2011, 09:37 AM
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Welding motorcycle frames.

Hi,a smaller tube inside a larger tube is called "using a hot dog"(thats all ive ever heard it called). to stretch a frame,get a longer hot dog,probably 2 inches longer on each end than stretch,get another piece of tube same size as frame. over hot dog,insert both ends into frame,you will need to weld both ends. i like to drill 2 or 3 holes in each end of original frame,,then weld thru holes into hot dog ends,then finish weld frame extensions.very strong.
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Old 02-07-2011, 11:58 AM
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Old 02-07-2011, 12:29 PM
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A big deal is to have the frame securely supported so it does not warp while welding on it..the "hot dog' is a good detail as well as taking the time to have well fitted joints..

Sam
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Old 02-07-2011, 01:04 PM
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I have heard the "hot dog" also refered to as a "slug". Also, as onemoretime said, Good fitted joints can make or break a joint like this. Another thing is to study the angles of the frame, Are the changes you are going to make cause more stress or leverage on another part of the frame? If so would a gusset or brace be nessecary? Take you time and plan three steps ahead of your self.
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Old 02-09-2011, 05:11 PM
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The above. If you have the equipment available, use a Mig to spot the joints in place and then use a Tig for the final weld. Broken frames on motorcycles can be deadly or very ugly at best.

From my years of racing, I learned a lot about rake angles and the effects of changing it by making adjustments to the frame. Arbitrarily lengthening you frame just might make it ride and handle like a pig in mud.

Trees
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Old 02-16-2011, 08:26 PM
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Thanks for the info guys. I am not specifically stretching a frame, Im just looking for any and all tips that will help me out. Thanks again ! Hern
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Old 02-17-2011, 07:42 AM
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It's a good idea to drill an 1/8" or so hole in the joints you are going to weld to let the expanding gases/air out of the tubes, then re-weld the hole shut when you are done-
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Old 02-17-2011, 12:10 PM
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One of the things I cannot stress too much is having a jig to support the frame while welding and fabricating..In a motorcycle frame all the alignment is welded in and there is no adjusment other than chain or belt tension so one has to be right on the money when he welds the frame up..

Sam
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Old 02-17-2011, 08:21 PM
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I agree with having a frame jig to keep it all square. i built a midget-ridget about 5 years ago. It had a dirtbike frontend, and i laid a three wheeler front end down with stem torwards front, broken sportster rotor welded to hub and cut off with a sprocket bolted to the rotor, powered by a 10hp tecumpseh. topped it off with a sissy bar, a casket shaped metal gas tank, 99 model harley handle bars, cool grips, chrome breather, dual exh, it was awesome. Except, SHE WAS CROOOOOKED. i welded it all together with it just resting on a brick-o-block. KEEP IT STRAIGHT!
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