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1. But the argon plasma arc voltage, low enthalpy is not high, cutting ability is limited, and cut the air than the thickness of the cut about 25% lower.

2. Arc current reducing rate and arc voltage at the time of arc discharging are established for every mathematical model.

3. Four, arc voltage: generally believe that the power supply is normal output voltage for cutting voltage.

4. The effects of arc voltage, welding current and heat input on the weld appearance in submerged-arc welding(SAW) of A105 steel with small diameter welding wire were experimentally researched.

5. The signal of arc voltage without distortion is got by use of photo-coupled isolator 6N136 to insulate signal voltage from arc voltage.

6. Because the hydrogen can significantly improve the arc voltage, make hydrogen plasma jet has high enthalpy, when mixed with argon plasma jet, the use of cutting ability is greatly increased.

7. This paper presents the model of arc voltage and the formula of calculation of arc current based on a large number of experiments of arc short circuit in low voltage networks.

8. To acquire the waveform of the arc voltage and the arc current in welding, a date collection system and digital filter is designed in this paper. The experimental result shows that it is Satisfied.

9. In some welding cases of high requirement to arc voltage and arc current, the usual wire feeding system is unable to meet the needs of wire feeding at present.

10. If this arc voltage saltation information can be extracted, we will get the characteristic information of necking down formation.

11. The welding current, arc voltage, preset current, the period and ratio of pulse, base current, down slope time, gas pre and post flow time are sampled , calculated and controlled by microprocessor.

12. The arc voltage is stability, arc force is strong and deposition efficiency is high.

13. The torch can bring higher arc voltage with lower fluctuation by elongating the arc.

14. The back-space decreasing is benefit to improve the arc voltage, pressure of arc chamber and change the arc motion in arc quenching chamber.

15. Fuzzy control tests of arc voltage and short - circuit frequency are conducted to improve welding quality.

16. The negative feedback of arc voltage makes the MIG welding machine to output constant-voltage external characteristic.

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17. In constant-current power supply to variable speed wire-feed system of SAW, the stability of arc voltage can be improved when using high-frequency, push-pull H-bridge driver wire-feed circuit.

18. It was observed that many unsuccessful choppings happened in the arc unstable processes, which induced the high frequency oscillation of the arc voltage and current.

19. A non power supply probe was developed to detect the plasma cloud voltage, which consists of plasma arc voltage gradient and plasma sheath voltage.

20. Testing results show that the major factors affecting the deposition efficiency are the welding current, arc voltage and gas flow rate under the condition of same circuit inductance.

21. Double closed loop is used in control system. Arc current is controlled by inner loop, and arc voltage and arc polarity is controlled by outer loop through 80C196KC single chip microcomputer.

22. Two PI adjusters were applied for wire feeding velocity control, one performed motor armature voltage feedback, the other one executed arc voltage feedback to determine the given velocity.

23. A plasma torch's height control system which is based on plasma arc voltage measuring is introduced.

24. The electron arc welding power source without sampling of arc voltage is introduced in this paper.

25. It was found that when the capacitive ignition occurred, arc voltage will keep minimum arcing voltage, but arc current possibly attenuates in sinusoidal form with different circuit parameters.

26. An auto - controlling system of arc length for AC - TIG welding with half-cycle arc voltage (workpiece positive) as a sensing signal is introduced in this paper.

27. The unit - chip ndcroro - computer controlled system for pulsed MIG welding of arc voltage mode has been developed.

28. Welding control device adopts microcomputer for process control, arc striking, welding, arc extinguishing control, auto arc voltage control and auto tracking of welding seams.