Technology
Welding two
different kinds of metals requires heating each of them to increase the strength
with the help of a nickel-containing alloy before and after welding. A research
team of Institute for Materials Research of Tohoku University developed a new technology
to weld two different kinds of metals strong without the extra jobs before and after
welding using a high-purity metal whose rate of impurities is as low as one
hundredth of the present level.
The team
members led by Prof. Kenji Abiko inserted a high-purity stainless steel whose
rate of impurity contents, such as carbon and nitrogen, is 100 nanograms per
one gram between a stainless steel used for plumbing and an ally used for the
container of a boiler, and successfully melted and welded them strong at a high
temperature using electric discharge. The welded part does not break even it is
folded by 180 degrees. It can be applied widely to power generation plants because
it can maintain durability for a long period at a high temperature. Highly
efficient thermal power generation requires pipe arrangements resistant to 700
degrees centigrade. A high-purity metal is most suitable for the welding of
these pipe arrangements, according to the research team.
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