Hello Fellas;
Back again. I was laid low yesterday with a touch of the old flu bug that's going around the neighborhood. I slept all day yesterday and ache like the devil today, but I couldn't stay in the bed any longer.
The brand of electrode does make a difference. At least to me it does. I can't argue with most of the comments made regarding that issue. I had terrible experiences with Hobart 718, but I loved their 418 low hydrogen electrode. The 718 resulted in too much convexity regardless of the amperage and I do like to run hot. The 418 produced a flatter bead and produced a smooth arc regardless of the position of the work.
I have had good results with Atom Arc and Excalibur. I run a lot of Excalibur when repairing some of the heavy steel castings and plate from which large presses are made due to the higher manganese content to counter any sulfur in the casting. So far, knock on wood, the results have been excellent.
My experience has been that pipe welders run cold compared to structural welders. It makes sense when you look at the work each is doing. In general, pipe welders are welding what most structural welders consider to be thin material, i.e., schedule 40 or even schedule 80 is relatively thin compared to 3/4 or 1 inch or thicker plate or structural sections. The problems associated with running low amperage rears its ugly head every time I test a pipe welder for structural steel. The flip side of the coin is that structural welders weld with higher amperage and struggle when they attempt to pass an open root pipe test. It is a matter of different techniques used by each industrial segment.
Well, keep your rods dry and keep the arc burning! Oh yea, check the polarity while you're at it.
Oops, I almost forgot, with regards to which welding machine is better, check the slope characteristics of the machine you are using. Some welder prefer a machine with steep slope because the current doesn't change drastically with a small change in arc length, while other welders (mostly pipe welders) prefer a machine with a shallower or flatter slope because it gives the welder more amperage variation as they vary the arc length. The internal inductance of the machine is going to determine how fast the machine reacts to variations in the arc length, thereby possibly producing too much arc instability if there is too little inductance. It’s all a balancing act and the nature of the work often dictates the particulars of the power supply.
And thanks for the vote of support! However, I did make my initial response unintentionally terse. JL's response wasn't completely unwarranted and it did make for an interesting thread. I still laugh as I read through them! I can use a good laugh today. Like a "Wuss", I cancelled the work I had lined up today to keep my little germs all to myself.
Best regards - Al