Keyhole welding of AA2219 aluminum alloy with double-pulsed variable polarity gas tungsten arc welding

被引：21
|
作者：
Wang Yipeng [1 ,2 ]
Qi Bojin [1 ,2 ]
Cong Baoqiang [1 ,2 ]
Zhu Mingjie [1 ]
Lin Sanbao [3 ]
机构：
[1] Beihang Univ, Sch Mech Engn & Automat, Beijing 100191, Peoples R China
[2] MIIT Key Lab Aeronaut Intelligent Mfg, Beijing 100191, Peoples R China
[3] Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Heilongjiang, Peoples R China
来源：
JOURNAL OF MANUFACTURING PROCESSES | 2018年 / 34卷
基金：
北京市自然科学基金; 中国国家自然科学基金;
关键词：
Keyhole welding; Aluminum alloy; Double pulses; Arc welding; MECHANICAL-PROPERTIES; STAINLESS-STEEL; AGING TREATMENT; K-TIG; JOINTS; MICROSTRUCTURES; PARAMETERS; BEHAVIOR; GTAW;
D O I：
10.1016/j.jmapro.2018.06.006
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A novel ultrasonic frequency double-pulsed variable polarity gas tungsten arc welding (DP-VPTIG) process was developed in the keyhole welding of 7 mm AA2219 aluminum alloy. The stable keyhole welding process was successfully achieved through analyzing the effects of characteristic current parameters on the weld formation. In low-frequency pulse peak stage, the fully penetrated keyhole formed owing to the high penetrating arc. In low-frequency pulse base stage, the keyhole closed as the arc force sharply declined. Fully equiaxed weld zone grain structures were obtained due to the stirring effect of the double pulses. The distribution of microhardness in the welded joint was consistent with that of the microstructure. It is expected to effectively improve the welding efficiency in aluminum alloy fabrication using DP-VPTIG process.
引用
收藏
页码：179 / 186
页数：8
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