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Ultrasonic welding of AZ31B magnesium alloy

Published online by Cambridge University Press:  05 August 2019

Jian Chen ,
Yong-Chae Lim ,
Hui Huang ,
Zhili Feng  and
Xin Sun
Jian Chen
Affiliation:
Materials Joining Group, Oak Ridge National Laboratory, USA; chenj2@ornl.gov
Yong-Chae Lim
Affiliation:
Materials Joining Group, Oak Ridge National Laboratory, USA; limy@ornl.gov
Hui Huang
Affiliation:
Oak Ridge National Laboratory, USA; huangh@ornl.gov
Zhili Feng
Affiliation:
Materials Joining Group, Oak Ridge National Laboratory, USA; fengz@ornl.gov
Xin Sun
Affiliation:
Energy and Transportation Science Division, Oak Ridge National Laboratory, USA; sunx1@ornl.gov
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Abstract

This article overviews the ultrasonic welding process, a solid-state joining method, using the example of welding of a magnesium alloy as well as the joining of magnesium alloys in general. In situ high-speed imaging and infrared thermography were utilized to study interfacial relative motion and heat generation during ultrasonic spot welding of AZ31B magnesium (Mg) alloys. A postweld ultrasonic nondestructive evaluation was performed to study the evolution of local bond formation at the faying interface (contact surface of the joint between the top and bottom Mg sheets) at different stages of the welding process. Two distinct stages were observed as the welding process progresses. In the early stage, localized reciprocating sliding occurred at the contact faying interface between the two Mg sheets, resulting in localized rapid temperature rise from the localized frictional heating. Microscale (submillimeter) bonded regions at the Mg–Mg faying surface started to form, but the overall joint strength was low. The early-stage localized bonds were broken during the subsequent vibrations. In the later stage, no relative motion occurred at any points of the faying interface. Localized bonded regions coalesced into a macroscale joint that was strong enough to prevent the Mg–Mg interface from further breakage and sliding. With increasing welding time, the bonded area continued to increase.

Keywords

weldingMgacousticbonding
Type
Joining of Dissimilar Lightweight Materials
Information
MRS Bulletin , Volume 44 , Issue 8: Joining of Dissimilar Lightweight Materials , August 2019 , pp. 630 - 636
Copyright
Copyright © Materials Research Society 2019 

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