Lincoln Electric IM892 POWER FEED 25M - Manual (Page 38)

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