I tried some 7018AC and 6011 electrodes in welding class today. I normally use 6013 (Lincoln Fleetweld 37) supplied by the school. It works very well but I wanted to try something different. I was very surprised to find the
7018AC easy to use. The arc was smooth and the bead looked beautiful (similar in appearance to 6013). The slag was very easy to chip off--easier than 6013, especially on a T-joint. But the 6011 was a different story. First, it made a very loud buzzing noise (kind of like AC TIG aluminum welding). The bead penetrated the metal well, but was unsmooth in appearance. The main problem was removing the slag. I had to literally pound the weld with all my might. And even then some slag remained on the surface. I'm not talking about slag trapped in a hole, but rather slag on the surface of the weld. I was using a Lincoln Idealarc 250 AC. 3/32" Lincoln Fleetweld 180 6011 rod from a new, sealed box. 1/4" mild steel. Flat weld. Lincoln recommended 70 amps--which I tried--but I also tried from 25 to 150 amps. Same problem. The class only has one AC/DC stick welder--the rest are AC only. I did most of the welds using AC but I tried the DC welder when it became available. Both straight and reverse polarity. There was very little difference. I can't figure out what I did wrong. Any ideas?- posted
20 years ago