Transactions of Nanjing University of Aeronautics & Astronautics
Effect of Arc Energy on Morphology and Microstructure of Laser-MIG Hybrid Welded Joints of Invar Alloy
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Abstract:
Laser-MIG hybrid welding experiments of 7 mm thick Invar alloy are carried out. The macro appearance of joints is observed and the influence of arc energy on the cross-section morphology is analyzed. The distribution of temperature field is simulated to explain the relationship between heat effect and microstructure. Besides， the average grain size of weld under different arc energies is quantitatively studied. The results indicate that welded joints with uniformity and good formation are obtained. The weld width and the weld seam area increase and the depth to width ratio decreases with the increase of arc heat input. The transition of columnar crystals to equiaxed crystals is observed from the fusion line to the weld center. It is found that the higher the arc energy， the coarser the columnar crystal.
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TG456
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