Laser beam-variable polarity plasma arc(LB-VPPA) hybrid welding belongs to New type of welding heat source with double high energy beam. Arc shape of LB-VPPA hybrid welding is analyzed by Y4-S2 high-speed camera, Based on mechanism of the hybrid heat source, heat source model of LB-VPPA hybrid welding, which is developed secondarily by Fortran language in SYSWELD software, is set up to achieve positive and reverse polarity cycle loading. Compared with the actual welding molten pool shape, the hybrid heat source model is combinded by double ellipsoid heat source in the upper part of weld pool and 3-D conical heat source with cylindrical heat source at keyhole in the lower part, the results show that the combinded heat source model meets with the actual hybrid heat source. The VPPA welding and LB-VPPA hybrid welding temperature field of the 6mm thickness 7A52 aluminum alloy is simulated by SYSWELD, This demonstrated LB-VPPA hybrid welding has obvious advantage in energy concentration, so it can keyhole welding at the flat position. Accuracy of the numerical simulations are proved by the comparison of the actual welding experiment and the simulation results. Therefore, heat source model of LB-VPPA hybrid welding is established accurately, it can provide strongly support for LB-VPPA hybrid welding of thick aluminum alloy.
SUN Zhenbang
,
HAN Yongquan
,
ZHANG Shiquan
,
HONG Haitao
. LB-VPPA Hybrid Welding Heat Source Model for Aluminum Alloy[J]. Journal of Mechanical Engineering, 2016
, 52(12)
: 46
-51
.
DOI: 10.3901/JME.2016.12.046
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