Journal
MATERIALS & DESIGN
Volume 50, Issue -, Pages 149-155Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2013.02.087
Keywords
Al alloy; Droplet transfer; Weld pool; Microstructure; Mechanical properties
Categories
Funding
- Shanghai Natural Science Foundation of China [11ZR1417500]
- National Natural Science Foundation of China [51204109]
- State Key Program of National Natural Science Foundation of China [51035004]
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In this paper, the effect of double pulsed gas metal arc welding (DP-GMAW) on metal droplet transfer, weld pool profile, weld bead geometry and weld joint mechanical properties of Al alloy AA5754 are presented. A high speed camera was utilized to reveal the metal transfer behavior and weld pool profile. A self-developed electrical signal acquire system was adopted to record the current waveform during welding process. The results indicated that the metal transfer, weld pool profile and weld bead geometry in DP-GMAW significantly differ with P-GMAW. The microstructure showed that grain size of the weld bead decreased with increasing of thermal pulse frequency, and the eutectic precipitates Mg2Si were homogeneously distributed at fusion zone. The mechanical properties of welded joints were improved. (C) 2013 Elsevier Ltd. All rights reserved.
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