Abstract
The microstructure and tensile mechanical properties of multi-layer multi-channel TIG welded joints of Al–Zn–Mg alloy plates were studied in this paper. The mechanical properties of the welded joint including microhardness and tensile performance were tested, respectively, while the microstructure was observed by scanning electron microscope, energy dispersive spectrometer, x-ray diffractor and transmission electron microscope. A short rod-shaped MgZn2 phase and a strip-shaped Al3Mg2 phase were found in the intergranular column of the weld seam, and an ellipsoidal MgZn2 phase was found in the intragranular column. The EDS test results of the micro-fracture and the fracture surface of the tensile specimen indicated that these particles could act as a strengthening phase or a crack source during the tensile fracture process. In addition, the distribution of microhardness in the weld zone was investigated.
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