Mathematical analysis of the role of recoil pressure in weld pool dynamics during laser-MIG hybrid welding |
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| Affiliation: | [1]Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University,Shanghai, 200240. [2]School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai,200240. |
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| Abstract: | A mathematical model was established to simulate the weld pool development and dynamic process in stationary laser-MIG hybrid welding. Surface tension and buoyancy were considered to calculate liquid metal flow patter, moreover, typical phenomena of MIG welding, such as filler droplets impinging weld pool, electromagnetic force in the weld pool, and typical phenomena of laser beam welding, such as recoil pressure, Inverse Bremsstrahlung absorption, Fresnel absorption were all considered in the model. The laser beam and arc couple effect were introduced into this model by the plasma width during hybrid welding. The role of recoil pressure in the weld formation was discussed. Transient weld pool shape and complicated liquid metal velocity distribution from two kinds weld pool to an unified weld pool were calculated. The simulated weld bead geometry with consideration recoil pressure was in good agreement with experimental measurement. |
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| Keywords: | laser-MIG hybrid welding mathematical model weld pool fluid flow recoil pressure |
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