FIRST WELDS!! 250EX in stick mode!!

[performance]

It will weld quick, but it will cause some contamination, and overheat the weld metal.

[DaveO]

It will weld quick, but it will cause some contamination, and overheat the weld metal.

Mark, do you mind explaining? Does the contamination occur because the 7018 is not rust tolerant?

[performance]

No, just welding at too high of an amperage for the rod, causes the arc to be more violent, and created air pockets in the metal, along with forcing slag down into the weld. Overheating the rod and the base metal creates a "brittle" area around the outside edge of the weld, known as the "heat affected zone" or referred to as the HAZ. The crystalline structure of the metal is changed in that area, opening itself up to the possibility of underbead cracking.

[SimpleSimon]

No, just welding at too high of an amperage for the rod, causes the arc to be more violent, and created air pockets in the metal, along with forcing slag down into the weld. Overheating the rod and the base metal creates a "brittle" area around the outside edge of the weld, known as the "heat affected zone" or referred to as the HAZ. The crystalline structure of the metal is changed in that area, opening itself up to the possibility of underbead cracking.

Thanks! Didn't know that.

[Bigwilly01]

Mark, do you mind explaining? Does the contamination occur because the 7018 is not rust tolerant?

If you run the amperage too high it will "crystalize" the bead. If you bend it it will break and look like the inside of the new hershey's kisses on the comercial with the air pockets. I know first hand. Ran a cert test with 1/8" 7018 way hot cause it looked good. Then bent and broke both my coupons.