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Visualization of dynamic keyhole behavior in waveform-controlled plasma arc welding

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Abstract

To overcome the shortcomings of conventional plasma arc welding (PAW), the “controlled pulse keyholing” strategy is proposed and the waveform-controlled keyhole PAW system is developed. To deeply understand the dynamic behaviors of keyhole in this novel PAW process, it is essential to measure and monitor the dynamic variation information of the keyhole geometry in real time. In this study, a vision system is developed to acquire the images of the keyhole from the underside of the workpiece. When a fully penetrated keyhole (open keyhole) is formed, clear keyhole images are captured. Both CCD camera and an efflux plasma voltage sensor are used to measure and characterize the keyhole shape and size during the waveform-controlled PAW process. The dynamic variation features of keyhole shape in a pulse cycle are visualized. The phenomena of “one keyhole in each pulse” and periodic partial-open keyhole transformation are experimentally sensed. The observation results lay solid foundation for controlling keyhole stability and optimizing the process parameters in keyhole plasma arc welding.

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References

  1. Raymond TN. Plasma welding-in the 90s. Proc. of IIW Asian Pacific Welding Congress, 4–9 Feb. 1996, Auckland, New Zealand, pp. 237–249

  2. Fortain JM. Plasma welding evolution & challenges. IIW Doc. XII-1948-08, 2008, pp. 1–11

  3. Martikainen JK, Moisio TJI (1993) Investigation of the effect of welding parameters on weld quality of plasma arc keyhole welding of structural steels. Weld J 72(7):329s–340s

    Google Scholar 

  4. Vilkas EP (1991) Plasma arc welding of exhaust pipe system components. Weld J 70(4):49–52

    Google Scholar 

  5. Mendez PF. New trends in welding in the aeronautic industry. Proc. of New Trends for the Manufacturing in the Aeronautic Industry, 24–25 May, 2000, San Sebastian, Spain, pp. 21–38

  6. Irving B (1992) Plasma arc welding takes on the advanced solid rocket motor. Weld J 71(12):49–52

    Google Scholar 

  7. Keanini RG, Rubinsky B (1990) Plasma arc welding under normal and zero gravity. Weld J 69(6):41–50

    CAS  Google Scholar 

  8. Zhang YM, Zhang SB (1999) Observation of the keyhole during plasma arc welding. Weld J 75(2):53s–59s

    Google Scholar 

  9. Metcalfe JC, Quigley MBC (1975) Keyhole stability in plasma arc welding. Weld J 54(11):401s–404s

    Google Scholar 

  10. Wu CS, Jia CB, Chen MA (2010) A control system for keyhole plasma arc welding of stainless steel with medium thickness. Weld J 89(11):225s–231s

    Google Scholar 

  11. Steffens HD, Kayser K (1972) Automatic control for plasma arc welding with constant keyhole diameter. Weld J 51:408–418

    Google Scholar 

  12. Zhang SB, Zhang YM (2001) Efflux plasma charge-based sensing and control of joint penetration during keyhole plasma arc welding. Weld J 80:157s–162s

    CAS  Google Scholar 

  13. Saad E, Wang H, Kovacevic R (2006) Classification of molten pool modes in variable polarity arc welding based on acoustic signature. J Mater Process Technol 174:127–136

    Article  CAS  Google Scholar 

  14. Chen Q, Sun ZG, Sun Wand J, Wang YW (2004) Closed-loop control of welding penetration in keyhole plasma arc welding. Trans Nonferrous Metals Soc of China 14:116–120

    Google Scholar 

  15. Zhang YM, Zhang SB, Liu YC (2001) A plasma cloud charge sensor for pulse keyhole process control. Meas Sci Technol 12:1365–1370

    Article  CAS  Google Scholar 

  16. Dong CL, Zhu YF, Zhang H, Shao YC (2001) Study on front side arc light sensing in keyhole mode plasma arc welding. Chin J Mech Eng 37:30–33

    Google Scholar 

  17. Zhang YM, Ma Y (2001) Stochastic modeling of plasma reflection during keyhole arc welding. Meas Sci Technol 12:1964–1975

    Article  CAS  Google Scholar 

  18. Saeed G, Zhang YM (2007) Weld pool surface depth measurement using a calibrated camera and structured light. Meas Sci Technol 18:2570–2578

    Article  CAS  Google Scholar 

  19. Wu CS, Gao JQ, Wang DM (2011) Observation of weld pool profiles in short-circuiting gas metal arc welding. Proc Instn Mech Engrs, Part B: J Eng Manuf 225:1873–1887

    Article  CAS  Google Scholar 

  20. Wu CS, Zhong LM, Gao JQ (2009) Visualization of hump formation in high speed gas metal arc welding. Meas Sci Technol 20:115702, 8pp

    Article  Google Scholar 

  21. Remy F, Sonia S, Frederic C, Francis B (2005) Study of keyhole behavior for full penetrated Nd-YAG CW laser welding. J Phys D: Appl Phys 38:1881–1887

    Article  Google Scholar 

  22. Krasnoperov MY, Pieters RRGM, Richardson IM (2004) Weld pool geometry during keyhole laser welding of thin steel sheets. Sci Technol Weld Join 9:501–506

    Article  CAS  Google Scholar 

  23. Fujinage S, Takenaka H, Narikiyo T, Katayama S, Matsunawa A (2000) Direct observation of keyhole behavior during pulse modulated high-power Nd:YAG laser irradiation. J Phys D: Appl Phys 33:492–497

    Article  Google Scholar 

  24. Li L, Brookfield DJ, Steen WM (1996) Plasma charge sensor for in-process non-contact monitoring of laser welding process. Meas Sci Technol 7:615–626

    Article  CAS  Google Scholar 

  25. Jia CB, Wu CS, Zhang YM (2009) Sensing controlled pulse key-holing condition in plasma arc welding. Trans Nonferrous Met Soc China 19(2):341–346

    Article  Google Scholar 

  26. Liu ZM, Wu CS, Chen MA (2012) Visualizing the influence of the process parameters on the keyhole dimensions in plasma arc welding. Meas Sci Technol 23:105603, 9pp

    Article  Google Scholar 

Download references

Acknowledgments

The authors are grateful to the financial support for this research from the National Natural Science Foundation of China (Key Program Grant No. 50936003).

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Authors and Affiliations

  1. MOE Key Lab for Liquid–Solid Structure Evolution and Materials Processing and Institute of Materials Joining, Shandong University, Jinan, China

    Z. M. Liu & C. S. Wu

Authors
  1. Z. M. Liu
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  2. C. S. Wu
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Correspondence to C. S. Wu.

Additional information

Doc. IIW-2390, recommended for publication by Commission XII “Arc Welding Processes and Production Systems.”

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Liu, Z.M., Wu, C.S. Visualization of dynamic keyhole behavior in waveform-controlled plasma arc welding. Weld World 57, 719–725 (2013). https://doi.org/10.1007/s40194-013-0072-0

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  • DOI: https://doi.org/10.1007/s40194-013-0072-0

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