Ultrasound enhanced friction stir welding of aluminum and steel:Process and properties of EN AW 6061/DC04-Joints

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2018,（1）
• 页码范围: 163-172
• 页数: 10页
• 语种: 英文

摘要

In this work,the joining of aluminum to steel was conducted by ultrasound enhanced friction stir welding (USE-FSW).The power ultrasound was introduced into one of the metal sheets by an ultrasonic roll seam module synchronously to the FSW-process.The effect of the ultrasound on the resulting welds,their microstructure and their corrosion properties was investigated by light and scanning electron microscopy and corrosion investigations.The USE-FSW-joints showed less and smaller steel particles in the nugget zone as well as a thinner continuous intermetallic phase of FeAl3 at the interface.The nondestructive testing method of computed laminography proved the observations made by optic microscopy due to non-porous joints for both techniques.Corrosion investigations showed only low corrosion current densities and no enhanced galvanic corrosion for the EN AW-6061/DC04-hybrid joints in sodium chloride solution.