I stopped by a friends shop yesterday and he had a freind of his welding a .625" plate he was stick welding to the rear of an old international dump truck. I asked what rod he was using and the one guy said "7031" (it looked like 3/16" or 1/4" dia.) Let me know if i have this straight since i do very little stick welding (all i ever use is 1/8" 6013 rod and it's rare, usually grab the mig) but the "70" means it's 70,000psi, the "3" is flat position, (which i thought "1" would be better since he was stitching up in a vertical position) and the "1" would be ac, dcep or en. I have never seen 7031 electrodes, could he have meant 7013?
thanks, walt