Abstract
A newly developed joining technique, ultrasonic resistance spot welding (URW), where high frequency ultrasonic vibration is effectively integrated into resistance spot welding (RSW) process, has been applied for joining transformation induced plasticity (TRIP) steel 780 to aluminum alloy Al 6061. Comparing URW with traditional RSW, up to 300% increase in strength and more than 150% increase in displacement to failure is achieved. Light optical microscopy (LOM) and scanning electron microscopy (SEM) revealed cracks and wide interfacial debonded regions in conventional RSW AlFe welds. With the assistance of ultrasonic vibrations, these interfacial cracks are effectively removed and a thin AlFe intermetallic layer (IMC) of around 3 um thickness is formed. SEM images of the fractured surface revealed that ultrasonic waves eliminated the eggcrate morphology generally observed in RSW welds fractured surface, which is a typical representative of solidification cracking. In situ high speed videos showed that ultrasonic vibration can help break off surface contamination and oxides as well as improving wetting of melted aluminum over the AlFe interface.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
