Electromagnetic Pulse Welded Aluminium to Copper Sheet Joints: Morphological and Mechanical Characterization
Loading...
Date
2016-04-27
Journal Title
Journal ISSN
Volume Title
Publisher
Alternative Title(s)
Abstract
This study investigated joining of Al to Cu sheets by electromagnetic pulse welding, which
is a solid-state welding process that uses electromagnetic forces to join materials. The
interfacial morphology and mechanical properties of the Al/Cu joints were analysed and
related to the welding process parameters. The centre section of the Al/Cu joints evolved
from a non-welded to a welded zone. The welded zone started with a wavy interface,
consisting of thick interfacial layers with defects and evolved to a relatively flat interface
without an interfacial layer. Interfacial phases resulted from solid-state mechanical mixing
and/or very localised interfacial heating. The interfacial layers had a thickness ranging
from 2-39 μm, an interface waviness amplitude up to 11 μm and contained 31-75 wt% Cu.
The interfacial layer thickness and the weld length are determined by both the discharge
energy and the stand-off distance. A trade-off existed between a homogeneous interface
and the maximum weld length when the stand-off distance is changed. The interfacial layer
exhibited an increased hardness compared to Al and Cu. A higher tensile force, up to
4,9 kN, was achieved at a higher energy and a lower stand-off distance. One of the factors
determining the tensile force was the width of the welded area.
Description
Table of contents
Keywords
welding, analysis, sheet metal