Microstructure Evolutions and Properties of Al-Cu Alloy Joint in the Pulsed Power Ultrasonic-Assisted GMAW

doi:10.1007/s40195-020-01066-4

Abstract

Abstract:

The pulsed power ultrasonic-assisted gas metal arc welding (PU-GMAW) is a new development hybrid welding method. The influences of the pulsed power ultrasonic on the microstructure evolution of the welded joint of Al-Cu alloy were investigated by using scanning electron microscopy, transmission electron microscope and electron back scattering diffraction. The results showed that the efficient heat input in the PU-GMAW was increased by above 100% compared with the traditional GMAW. The grain and eutectic of the PU-GMAW weld seam were refined compared with that of the GMAW. Cavitation and acoustic streaming induced the dendrite fragmentation (α-Al) and heterogeneous nucleation, which were the main reasons for the grain refinement. The microhardness of the PU-GMAW welded joint was improved compared with that of the GMAW owing to the change of the eutectic and grain.

Key words: Pulsed power ultrasonic, Al-Cu alloy, Microstructure, Cavitation, Acoustic streaming

Chao Chen, Chenglei Fan, Zeng Liu, Xiaoyu Cai, Sanbao Lin, Yimin Zhuo. Microstructure Evolutions and Properties of Al-Cu Alloy Joint in the Pulsed Power Ultrasonic-Assisted GMAW[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(10): 1397-1406.

Figures/Tables 12

Fig. 1 Schematic of the PU-GMAW process

Fig. 2 Location of the hardness samples

Fig. 3 Weld cross section in the different welding processes: a 6 m/min, b 7 m/min, and c 8 m/min

Fig. 4 Heat affect zone widths

Fig. 5 Distribution and morphology of the eutectic phase: a GMAW, b PU-GMAW, c base metal, d EDS of A point, and e EDS of B point

Fig. 6 Distribution and morphology of the precipitated phase: a base metal, b GMAW weld metal, and c PU-GMAW weld metal

Fig. 7 Results of EBSD near the fusion line: a GMAW; b PU-GMAW

Fig. 8 Results of EBSD in the weld center: a GMAW; b PU-GMAW

Fig. 9 Distribution of the microhardness of the weld bead

Fig. 10 Schematic illustration of the effects of the ultrasonic on the welding process

Fig. 11 Schematic illustration of the weld pool solidification

Fig. 12 Phase diagram of Al-Cu

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