Microstructure and mechanical property of A7N01 aluminum alloy welded by laser-MIG hybrid method with assisting ultrasonic vibration

作者：Zhu, Zongtao; Zhu, Quanchao; Li, Yuanxing; Chen, Hui

来源：Transactions of the China Welding Institution, 2016, 37(6): 80-84.

• Aluminum alloy joints
• Aluminum alloy welding
• Deep-penetration welding
• Hybrid welding
• Microstructure and mechanical properties
• Porosity defects
• Stereo-microscopes
• Ultrasonic vibration

To solve the porosity defects in aluminum alloy joints obtained by laser-MIG hybrid deep-penetration welding, this article presents a novel laser-MIG hybrid welding method through applying ultrasonic vibration to the work piece. The number, size and distribution position of porosities in building-up layer on A7N01 aluminum alloy are investigated by X-ray detection and cross-section observation in stereo microscope. The effects of ultrasonic vibration on the morphology, microstructure and mechanical properties of the joints are also studied. The results show that the number and size of the porosities in building-up layer by laser-MIG hybrid welding significantly decrease, due to ultrasonic vibration accelerating the gathering and rising of small size porosities. The belt of columnar grains along fusion line near the building-up layer becomes thinner with the effects of ultrasonic vibration. The impact toughness and tensile strength are improved in some extent due to the introduced ultrasonic vibration in the laser-MIG hybrid welding method, so that it is supposed to be a good way for aluminum alloy welding.

• 出版日期2016-6-25
• 单位西南交通大学