I had to weld a piece of thin wall 1/2 inch aluminum tubing on a project tonight. Just had the one thing to weld so I thought I would practice doing some thin stuff since that often defeats me. I cut a couple of pieces of 1/16 thick 1 inch alum angle. first I welded the outside corners making a box. Nice small bead worked OK. Used 1/16 wire and some .030 mig wire. not perfect but serviceable and pretty clean.Then I tried 2 new similar pieces and laped them over to try inside corners. Tried both sides but seemed to not be able to get the heat close enough to the virtex and the start seemed a little dirty too and too hot. So I moved over to the flat face to see if my parameters were reasonable. Got a prefectly Ok bead there. So I did more down the face. just for fun I switched from 1/16 rod to 3/32 rod (and 1/8 too). I wondered if the fatter rod would let me do law wire somehow. As I suspected it didn't quite work ....... however I modified the process by bringing the tip of the rod out about 1/8 away from the puddle so I didn't have to go far to deposit. When I did that I noticed that the dips sucked the heat away from the puddle ( in a good way) So next I tried keeping a steady travel speed and picked the exact time to dip to be just after the puddle traveled left under the tungsten- then a dip.This process of kind of quenching the puddle with the oversize rod seemd to prevent too much heat. I did about 4 beads on each of the 4 sides of the box and then looked inside at the inner surface. There were no burn throughs(or distortions visible) save about the first 1/8 inch where I started the bead - where it made a little notch. the hardest part seemed to be depositing the very first droplet at the beginning. Seems like the tip of the tungsten is kind of in the way. (zero push angle)I am guessing that this technique might be something that everyone else allready knows........It seems like I am doing the same thing - but I am thinking about the dynamics of what I am doing differently (if that makes sense- ?)Can yall give me some feedback if this is on the rite track for improving on thin aluminum ?(used 1/16 thor. electrode- about 12 cfh - 70% neg (30%cleaning) - # 8 cup gas lense - about 70 amps full pedal - 250 hz down to 20 Hz.)Thanks ahead of time !TimLast edited by jethro; 09-18-2011 at 02:27 AM.
发表于 2021-8-31 23:23:52