Arc discharge and pressure characteristics in pulsed plasma gas of PAW
- 6 Downloads
This paper investigated the arc characteristics in pulsed plasma gas of plasma arc welding using a synchronous image- and electrical signal-acquisition system. The arc sizes (including the arc length L, the arc width on the water-cooling copper plate surface Wa, and the arc width under the nozzle Wc) and arc voltage changed regularly with the plasma gas periodically on/off. And the changing trends of arc sizes were affected by the plasma gas flow rate and the plasma gas switching frequency. The changing scale of arc voltage was proportional to the plasma gas flow rate and was inversely proportional to the plasma gas switching frequency. The average plasma arc welding (PAW) and plasma arc welding with pulsed plasma gas (PPG-PAW) arc voltages were equal when the plasma gas flow rate was the same. The arc pressure also presented cyclical changes during the plasma gas on/off, and the changing scale and the axial mean value were inversely proportional to the plasma gas switching frequency. The periodically oscillating arc and arc pressure would be beneficial to the refinement of grain structure during the welding process.
KeywordsArc characteristics Pulsed plasma gas Plasma arc welding Arc pressure
Unable to display preview. Download preview PDF.
This work is supported by National Natural Science Foundation of China (No.51875004), Beijing Natural Science Foundation (3172004).
- 4.Benjamin D, Yadaiah N, Rupshree O, Sohini C, Arpan KM, Muralidhar M (2017) A perspective review on estimation of keyhole profile during plasma arc welding process. Mater Today Proc 5(2):6345–6350Google Scholar
- 7.Wu CS, Zhao CY, Zhang C, Li YF (2017) Ultrasonic vibration assisted keyholing plasma arc welding. Weld J 96:279–286Google Scholar
- 9.Wu CS, Jia CB, Chen MA (2010) A control system for keyhole plasma arc welding of stainless steel plates with medium thickness. Weld J 89(11):225–231Google Scholar
- 10.Li XR, Shao Z, Zhang YM (2012) Double stage plasma arc pipe welding process. Weld J 91(12):346–353Google Scholar
- 12.Chen SJ, Jiang F, Lu YS (2013) Arc separability and measurement of arc components. AWS Professional Program and Poster Session, ChicagoGoogle Scholar
- 13.Chen SJ, Jiang F, Lu YS, Zhang YM (2014) Separation of arc plasma and welding current in electrical arc—an initial study. Weld J 93:253–261Google Scholar
- 16.Vredeveldt H (2014) Increased power density plasma arc welding: the effect of an added radial gas flow around the arc root. TU Delft, Delft University of TechnologyGoogle Scholar
- 21.Dai DS, Song YL, Zhang H, Zhu YF (2002) Study on arc force in plasma welding. Trans China Weld Inst 23(2):51–54Google Scholar
- 22.Yang ZD, Fang CF, Chen Y, Liu B, Hu QX, Gu XY (2018) Effect of forces on dynamic metal transfer behavior of cable-type welding wire gas metal arc welding. Int J Adv Manuf Technol 97(1–4):81–90Google Scholar