Abstract
Keyhole welding has an advantage in high efficiency, but the narrow process window for stable keyhole is a critical issue for application. Double-layer coaxial hybrid arcing technology is developed to decouple the heat and pressure properties in an arc source; this will improve the controllability of the weld pool thermal-force state. In this research, an arcing torch, designed by embedding an outer ring tungsten into the plasma arc nozzle to form a double-layer coaxial hybrid arc, was experimentally tested for its application possibility in the keyhole welding process. From the arc image and arc pressure results, stable hybrid arcing process was successfully achieved in the torch when the outer arc current is lower than 30 A. The arc pressure/current ratio in the outer arc current is about half to that in the center plasma arc current. Applying a 10-A outer arc current, keyhole welding can be achieved at a given center arc current of 110 A, which is lower than the threshold current for keyhole welding in an 8.3-mm thick 304 stainless steel plate. In the keyhole welding process in a 4.0-mm thick 304 stainless steel plate, keyhole behavior and the resultant weld have invisible change between the welding process with the hybrid arc torch and the ordinary plasma arc torch. The experimental test results give a promising method to improve the keyhole welding process window.
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References
Wu CS (2010) Welding thermal processes and weld pool behaviors. CRC Press
Yan ZY, Chen SJ, Jiang F, Zhang W, Huang N, Chen R (2020) Control of gravity effects on weld porosity distribution during variable polarity plasma arc welding of aluminum alloys. J Mater Proc Technol 282(8):116693
Cui SL, Liu ZM, Luo Z, Fang YX, Manladan SM, Yi S (2017) Keyhole process in K-TIG welding on 4mm thick 304 stainless steel. J Mater Proc Technol 243(5):217–228
Liu ZM, Wu CS, Liu YK, Luo Z (2015) Keyhole behaviors influence weld defects in plasma arc welding process. Weld J 94(9):281-s-290-s
Liu ZM, Cui SL, Luo Z, Zhang CZ, Wang ZM, Zhang YC (2016) Plasma arc welding: process variants and its recent developments of sensing, controlling and modeling. J Manuf Proc 23(8):315–327
Zhang SB, Zhang YM (2001) Efflux plasma charge-based sensing and control of joint penetration during keyhole plasma arc welding. Weld J 80(2):157–162
Zhang YM, Zhang SB, Liu YC (2001) A plasma cloud charge sensor for pulse keyhole process control. Meas Sci Technol 12:1365–1370
He DF, Katsunori I (1984) Penetration-self-adaptive free-frequency pulsed plasma arc welding process controlled with photocell sensor. Trans JWRI 13(1):7–11
Zhang YM, Zhang SB (1999) Observation of the keyhole during plasma arc welding. Weld J 78:53-s-58-s
Liu ZM, Wu CS, Chen MA (2014) Experimental sensing of the keyhole exit deviation from the torch axis in plasma arc welding. Inter J Adv Manuf Technol 71:1209–1219
Jian XX, Wu CS (2015) Numerical analysis of the coupled arc–weld pool–keyhole behaviors in stationary plasma arc welding. Int J Heat Mass Tran 84:839–847
Zhang QL, Yang CL, Lin SB, Fan CL (2014) Novel soft variable polarity plasma arc and its influence on keyhole in horizontal welding of aluminum alloys. Sci Technol Weld Join 6:493–499
Zhang QL, Yang CL, Lin SB, Fan CL (2015) Soft variable polarity plasma arc horizontal welding technology and weld asymmetry. Sci Technol Weld Join 4:296–306
Hessel LV (2014) Increased power density plasma arc welding. Master thesis, Delft University of Technology
Li TQ, Yang XM, Chen L, Zhang Y, Lei YC, Yan JC (2020) Arc behavior and weld formation in gas focusing plasma arc welding. Sci Technol Weld Join 25(4):329–335
Qiao JN, Wu C, Li YF (2020) Numerical and experimental investigation of keyholing process in ultrasonic vibration assisted plasma arc welding. J Manuf Proc 50:603–613
Liu ZM, Liu F, Zhao XC (2022) A novel arc plasma generating method by coaxial hybrid a ring arc to constraint arc: principle and progress. J Manuf Process 82(10):362–373
Xu B, Chen SJ, Tashiro S (2021) Physical mechanism of material flow in variable polarity plasma arc keyhole welding revealed by in-situ x-ray imaging. Phys Fluids 33(1):17121
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All the experiments were financed and supported by National Natural Science Foundation of China (51,975,403).
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ZuMing Liu designed the study, performed the research, analyzed data, and wrote the paper; Fei Liu, data processing.
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Liu, Z., Liu, F. Keyhole welding with double-layer coaxial hybrid arc torch: a primary work. Int J Adv Manuf Technol 125, 5493–5501 (2023). https://doi.org/10.1007/s00170-023-11095-9
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DOI: https://doi.org/10.1007/s00170-023-11095-9