Welding Tips and Tricks

I started a repair project. These arms pivot on cast bosses on the rear of planters, they wear out and typically people buy new and replace worn parts, I machined some tubing to accept roller bearings and tig welded the machined bosses to the worn out frame. I tack welded aluminum channel to 1/4 inch 6061 plate, don't look pretty but I keep kicking 60 amp breaker every time I get the alum rolling.but works well for a fixture. I have twelve of these to do. Two bushings to each frame.