Hi I am building a got trikes tube bender and have to weld 1/4" 2x2 tubing and some tabs that are 1/2" and 5/8". I have a Miller Dynasty 200Dx and would like to tig weld it together using multiple passes. I was wondering what is the best way to go about this, the more I read about multipass welding the more confused I get because no 2 people seem to do it in the same way. I am running my welder on 110 currently but just built an extension chord that I can run inside to plug into my dryer plug if needed.
I did a test piece where i welded two pieces of tubing together in a L shape. I beveled the 2 sides of the 1/4" tubing so that it was about .150-165" thick. The other to sides i did not bevel because the round corners of the tubing acted like a bevel and and allowed me to get penetration. The first passes were done at 150amps with the pedal maxed out almost all the way. I had read you should use 60/80% on the cap passes so i turned the amperage down to 105 but am not sure if that was the right call especially since I went to eat supper between the the root passes and the cap passes so the piece cooled. I was also using 3/32" tungsten with 3/32" er70s-2 filler. I did 2 passes on 3 of the sides and 3 passes on the fillet joint.
I was wondering if the was a better way to do this or if anyone else has done it in a different manner?
For the 1/2" and 5/8" tabs I have access to both sides to weld so I can bevel both sides. How much material should I leave between when I bevel (believe that called a land)?
Another note I took the tig welding course at the local college 5 years ago but We never covered multipass tig welding. I have also forgotten most of the terminology so my post my be lacking some of the technical terms people are used to using.
I did a test piece where i welded two pieces of tubing together in a L shape. I beveled the 2 sides of the 1/4" tubing so that it was about .150-165" thick. The other to sides i did not bevel because the round corners of the tubing acted like a bevel and and allowed me to get penetration. The first passes were done at 150amps with the pedal maxed out almost all the way. I had read you should use 60/80% on the cap passes so i turned the amperage down to 105 but am not sure if that was the right call especially since I went to eat supper between the the root passes and the cap passes so the piece cooled. I was also using 3/32" tungsten with 3/32" er70s-2 filler. I did 2 passes on 3 of the sides and 3 passes on the fillet joint.
I was wondering if the was a better way to do this or if anyone else has done it in a different manner?
For the 1/2" and 5/8" tabs I have access to both sides to weld so I can bevel both sides. How much material should I leave between when I bevel (believe that called a land)?
Another note I took the tig welding course at the local college 5 years ago but We never covered multipass tig welding. I have also forgotten most of the terminology so my post my be lacking some of the technical terms people are used to using.
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