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STT WAVE SHAPING PRINCIPLES
Appendix B
B-13
B.5.2 BACKGROUND CURRENT
The Background current controls the overall heat input to the weld. Adjusting this level too high
will form a large droplet resulting in globular type transfer and increased spatter. Adjusting this
level too low will cause wire stubbing and poor wetting of the weld metal.
ADJUST BEAD SHAPE USING BACKGROUND CURRENT
LOW
OPTIMUM
HIGH
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NOTE: Applications using 100% CO
require less background current than similar procedures
2
using high Argon blends. This is due to greater heat generated in the 100% CO
arc.
2
CONTACT TIP TO WORK DISTANCE
LONG
OPTIMUM
SHORT
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B.5.3 TAILOUT
The tailout provides additional heat without the molten droplet becoming too large. Increase
tailout as needed to add heat to the arc without increasing arc length. (This will allow for faster
travel speeds and improved wetting). As tailout is increased, the peal and/or background current
is usually reduced.
WAVE DESIGNER
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