Title: Ultrasonic welding of AZ31B magnesium alloy

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. Here, 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.more » With increasing welding time, the bonded area continued to increase.« less

Authors:

Chen, Jian  ^[1];

• Search DOE PAGES for author "Chen, Jian"
• Search DOE PAGES for ORCID "0000-0001-6532-1081"

Lim, Yong -Chae  ^[1];

• Search DOE PAGES for author "Lim, Yong -Chae"
• Search DOE PAGES for ORCID "0000-0003-2177-3988"

Huang, Hui  ^[1];

• Search DOE PAGES for author "Huang, Hui"
• Search DOE PAGES for ORCID "0000-0002-2205-2157"

Feng, Zhili  ^[1];

• Search DOE PAGES for author "Feng, Zhili"
• Search DOE PAGES for ORCID "0000-0001-6573-7933"

Sun, Xin ^[1]

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+ Show Author Affiliations

1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Publication Date:

Mon Aug 05 00:00:00 EDT 2019

Research Org.:

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1557514

Grant/Contract Number:  

AC05-00OR22725

Resource Type:

Accepted Manuscript

Journal Name:

MRS Bulletin

Additional Journal Information:

Journal Volume: 44; Journal Issue: 08; Journal ID: ISSN 0883-7694

Publisher:

Materials Research Society

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE