|
Hi MO, DC is best for mild steel welding because of greater arc stability, weld puddle contour, welding ease most of the time, than does AC. Chemtron 7018 welding rod, used DCRP, is the best 7018 ever made, in my opinion. DCRP= electrode positive (the rod holder) or also called reverse polarity
DCSP= electrode negitive or also called straight polarity A/C has no polarity. AC oscillates between postive and negitive and is why it's used to weld alumnium as it cleans the metal on each oscillation. Lincoln 6010 or P5, DCRP for clean mild steel, Lincoln 6011 DCRP for clean mild steel
AC or DCSP for glavanized my 1st choice Lincoln 6013 DCRP, AC. If welding flat or horzontial, Lincoln 7024 or jet rod used DCRP. They don't call it jet rod for nothing as it welds very fast and flat. It's the rod flux, application and mfg. that determines the first choice or only choice of type of welding current. The rod numbers are defined as follows: Example 7018
First two numbers is the rated tensil strength in thousands
70/18 would be 70,000psi tensil strength Third number is weld postion 1= All positions, 2= flat & horzontial postion, 3= flat only
70/1/8, with 1 being all welding positions. Fourth number is the type of rod flux coating. there's ten so I will not list them all.
701/8= 8 being a iron powder coating You can make a certified welds with DC or AC. I included this info that I had already posted as a guide line and answers your questions.
Great buy on the Miller. Should be a dandy! T_Bone
| 
