Posted by Stick welding on September 09, 2012 at 22:31:52 from (220.127.116.11):
Finally had a dry weekend where I could finish building my heavy duty scarifier for the 3 pt. hitch. It's made out of 14" wide flange that's somewhere around 105lbs./ft and has 15 backhoe teeth adapters welded on. Welding the adapters on had no problems other than they were made for a 1" edge and the beam I had was only 3/4". I had a gap to fill and used 2 passes of 3/16" 7018 after filling the gap. I cranked the heat (amps) up and they welded really easy.
Fast forward to welding the 3 pt. mounts on. They are the ones cut on a $250,000+ CNC plasma table. First I had to use a die grinder to ream the holes a little for the pins to fit. Then I prefabbed the uprights with a 2" spacer separating them. I had to grind the edges of the spacer flat because it had about 5 deg. angle on the cuts. The uprights also had an angle on the cut and made it a pain to line everything up. I got it lined up but after tacking all the mounts in place, I took out the 3/16" rods and proceeded to weld them on. I put the ground right on the mounts but sure got a lot of arc blow. The rods started off great but on just about every pass, they would act up about 3/4 of the way to the end. I'd start off with a normal 15 deg. rod angle and have to change to about a 15 deg. push angle to counteract the arc blow. I've had arc blow before but never like this. Usually after you get the first pas in, the second pass goes pretty smooth. What's puzzling is that I didn't have any problems with arc blow welding the adapters on and I used more heat. 4th gear at about 85/90 on a SA200. Maybe if I had the rods in an oven and wrapped the ground cable around the beam would have helped? It's never going to break so I didn't experiment too much but luckily I had a sharp chisel to clean the spatter when it acted up.
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