Ohio State-developed welding technique makes
auto industry, which is poised to offer new cars that combine
stronger welds using less energy
microstructure when we weld,” he said.
traditional heavy steel parts with lighter, alternative metals to
“With our method, materials are shaped
Engineers at The
reduce vehicle weight.
and bonded together at the same time,
Ohio State Univer-
Despite recent advances in materials design, alternative
and they actually get stronger.”
metals still pose a challenge to manufacturers in practice.
In resistance spot welding, manu-
Ohio, have devel-
Many are considered unweldable by traditional means, in
facturers pass a high electrical current
oped a new weld-
part because high heat and resolidification weaken them, said
through pieces of metal, so that the
metals’ natural electrical resistance
ing technique that
Glenn Daehn, professor of materials science and engineering
generates heat that partially melts them
consumes 80 percent less energy than a common welding
at Ohio State, who helped develop the new technique.
yromeus2005.qxp 11-05-2005 13:20 Side 1
together and forms a weld. However,
technique, yet creates bonds that are 50 percent stronger.
“Materials have gotten stronger, but welds haven’t. We can
the high currents consume a lot of en-
The new technique could have a significant effect on the
design metals with intricate microstructures, but we destroy the
ergy, and the melted portions of metal
are never as strong afterward as they
Over the last decade, Daehn and
his team have been trying to find
Flexible, effective, fast