Lincoln Electric POWER FEED 25M Service Manual page 40

B-22
Peak
Current
Too Low
Background
Current
Too Low
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OPERATION
PEAK CURRENT
(Figure B.16)
Peak current controls the arc length, which also affects
the shape of the root. When using 100% CO
current will be higher than when welding with blended
shielded gases. A longer arc length is required with
CO to reduce spatter.
2
FIGURE B.16
Peak
Current
Optimum
BACKGROUND CURRENT
Background current adjusts the overall heat input into
the weld. Changing the background current changes
the shape of the back bead. 100% CO
background current than when welding with blended
shielding gases.
FIGURE B.17
Background
Current
Optimum
TAILOUT
Tailout provides additional heat into the weld without
increasing the arc length or the droplet size. Higher tai-
lout values improve wetting and may give faster travel
speeds.
POWER FEED® 25M
, the peak
2
Peak
Current
Too High
(Figure B.17)
requires less
2
Background
Current
Too High
B-22