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Old 12-06-2013, 11:47 AM
el Diablo Guapo el Diablo Guapo is offline
Motorized Bicycle Senior Member
Join Date: Nov 2013
Location: earth
Posts: 79
Default frame stretch ~my way insert slugs welded inside in

this may not be the only way or the best way to stretch a frame, but i feel confident in the strength of the end result. Far more confident than simple butt splices

i create insert slugs using tubing with a similar diameter to my work, these are a snug fit inside the work and protrude past the ends of the finished tube ends

this provides structural support, doubles the wall thickness, and provides a heat sink when doing the exterior butt weld allowing better penetration

first i slit the tubing, twice to remove a strip approximately 1/2 inch wide

then i use a rubber mallet to convice the tubing of it's new diameter, gentle - keep it round(ish) and slip it inside the sleeve and ultimately the recieving ends

i drill some holes in the recieving tube, to be welded in, holding the slug in place

then i go back and do the but welds on the exposed work piece
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