wobble bike

Step 4 Weld the parts together

 I've highlighted in green the part that came from bike #2. In purple are 2 steel bolts I welded on to set the tube angle. Check the positioning before you weld it to make sure the pedals are a reasonable height off the ground when pedaling. You can't weld to a painted bike tube, so near the weld area use the paint-stripping wheel to clean the tubes down to bare metal.  

after welding, paint it!