|
Hi Richard, Tim's got that right. Don't breath the fumes. A trick I learned many moons ago is to turn your welding hood at an angle on it's side. The smoke hits the side of the hood and rolls up. This keeps the fumes from going inside your hood and your lens cleaner. A good exhaust hose is the best and required by OSHA and a great idea but still turn your hood. Without more info: been helpful to know what your doing with the pipe (seal weld, certified weld, structure weld, etc)? welding equipment available? I'll assume your seal welding the pipe and your welding more than a few pieces. The problem your having is your using Mig on 1-7/8" tin wall pipe. 2" pipe is to small to Mig or stick weld for most applications and do it well. If Your stuck with Mig then use a slicon bronze filler wire. Runs much smoother without alot of splatter and tip plug up. Try atleast 35cfh of Co2 and use a #5 cup. Precleaning the galvanized is not required with this method. My first choice would be carbon arc with a 1/8" silcon bronze filler rod. Again no galvanized prep required. DCEN using a normal rod holder. The carbon electrode will have a copper jacket around it. Remove some copper by pealing with your finger nail about 3/4", then sharpen the black carbon to a fine point. You start the carbon electrode directly on top of the filler rod, when the carbon tip becomes cherry red then raise the carbon just a tad and the slicon bronze will run like butter. Very fast and smooth. A good weld to about 36,000 tensil. If your doing a few pieces do just what Tim suggested, grind off the galvanized. Run alittle hotter but alot faster. Start at the top center and weld down hill to the bottom center then do the other side. Co2 would be a better cover gas. T_Bone
| 
