W A V E F O R M C O N T R O L T E C H N O L O G Y T M
APPLICATION
Making Fillet Welds with Power Wave AC/DC 1000™ System | 5/10 |
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Welding Guide |
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Square Wave Frequency
While frequency is historically accepted to be fifty or sixty hertz, the Power Wave AC/DC 1000™ can function at any chosen frequency between zero (DC) and 100 hertz. Frequency can play an important role in a specific welding procedure. Relative to a “normal” sixty hertz, deposition rates can be slightly increased or decreased as can penetration. Frequency alters the total time for the arc to be at peak values. As the frequency decreases, more time is available at peak value and – more importantly – less time is spent in the transition region. The converse occurs as frequency is increased. Figure 8 (frequency effect) illustrates this by showing what occurs during one complete cycle.
As the frequency of the AC wave is altered, the amount of time spent at peak current and voltage values and the amount of time spent transitioning from positive to negative values also changes.
In general, as the frequency is lowered, more time is spent at peak values and less time transitioning. As the frequency is increased, the opposite occurs.
This can be of considerable help when making fillet welds between thick and thin members in reducing
Figure 8
Conventional sine waves (in red) are superimposed
schematically with Power Wave square waves to illustrate the frequency effect. The voltage and current values are identical for all three curves.
T h e | f u t u r e | o f | w e l d i n g | i s | h e r e . | ® |
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