Set the main circuit DC voltage to high voltage cutting - 300v. The waveform of Figure 6 is obtained according to different duty ratios.

Figure 6-1 EVA is set to output symmetric PWM, duty cycle 1/3, main circuit current waveform

Figure 6-2 EVA is set to output symmetric PWM, duty cycle 1/2, main circuit current waveform

Figure 6-3 EVA is set to output symmetric PWM, duty cycle 2/3, main circuit current waveform

In Figure 6-1, the formula T=R×C, T=L/R shows that the main circuit resistance is very small. At this time, the charge and discharge time is mainly determined by T=L/R, so the voltage waveform is steep and the cutting is guaranteed. When the current requires the voltage waveform to meet the requirements, we have to change the duty cycle. However, if there is more time for the current to the cutting requirements, we can also increase the resistance to adjust the current waveform.

Conclusion: Under high voltage and high current cutting, set the pulse to 2/3. This ensures that the output waveform satisfies the requirements of the line-cut voltage and current waveforms.

Set the main circuit DC voltage to low voltage cut - 80v. The waveform of Figure 7 is obtained according to different duty cycles.

Figure 7-1 EVA is set to output symmetric PWM, duty cycle 1/3, main circuit current waveform

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   End Feed Copper Fitting and Copper Reducing Coupling are all used automatic machine to process .The advantage is that the both end's thickness is similar .The small end's thickness also will not increase too much .
1. Corrosion resistance, good color and luster;