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OPERATION | ||
STT WELDING |
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The pictures illustrate the waveshape of current for the | Trim in the STT mode adjusts the tailout and back- | |
process. They are not drawn to scale, and are intend- | ground portion of the waveform. Trim values greater | |
ed only for the purpose of showing how the variables | than 1.0 add more energy to the weld and make the | |
affect the waveform. | weld puddle hotter; trim values less than 1.0 reduce | |
| energy to weld. A nominal value of 1.0 will work for | |
most applications. (See Figure B.4.)
FIGURE B.4 – STT TRIM CONTROL CHARACTERISTICS
Trim 1.50
Current
Trim 1.00
Time
Trim 0.50
For most programs, peak current is adjusted by wave | NOTE: The ranges on Wave Control and Trim are |
control values. A value of +10.0 maximizes the peak | dependent on the weld programs. The values |
current, while a wave control of | shown are typical ranges. |
current. In general, the peak current is proportional to |
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torch arc length. (See Figure B.5.) |
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FIGURE B.5 – STT WAVE CONTROL CHARACTERISTICS
Wave Control +10.0
Wave Control 0.00
Wave Control
