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OPERATION | ||
| PEAK CURRENT (Figure B.16) |
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| Peak current controls the arc length, which also affects |
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| the shape of the root. When using 100% CO2, the peak |
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| current will be higher than when welding with blended |
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| shielded gases. A longer arc length is required with |
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| CO2 to reduce spatter. |
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| FIGURE B.16 |
|
Peak | Peak | Peak |
Current | Current | Current |
Too Low | Optimum | Too High |
BACKGROUND CURRENT (Figure B.17)
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Background
Current
Too Low
Background current adjusts the overall heat input into the weld. Changing the background current changes the shape of the back bead. 100% CO2 requires less background current than when welding with blended shielding gases.
FIGURE B.17
Background | Background |
Current | Current |
Optimum | Too High |
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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.
