I welded my motor mounts on the beast, and an pleased with the results. I have very minimum vibration, the motor is rock solid, and no worries about mounts shifting. Bike frames are made from very thin tubing, and can be different alloys. Your welder should be fine, settings would depend on thickness of your mount material. I welded my 1/4" plate to frame at a setting of 18 amps, but my welder is a high dollar 200 amp welder. If you are using a HF WELDER or similar you may need to set your welder at max to get penetration on your mounts, and take a chance of blowing holes in your frame. PRACTICE ON SCRAP MATERIAL, save yourself frustration, and possibly ruining your frame.