http://www.rdmag.com/News/2010/03/Materials-Magnetic-Materials-Magnetic-Sol=
ders-Are-Leap-Towards-Green-Alternatives/

First, the iron makes the alloy much stronger than it would ordinarily  =

be. When an external magnetic field is applied to the molten solder,  =

these particles align themselves within the solder, making it even  =

stronger once it again solidifies.

Second, the iron overcomes the problem of tin-silver having a higher  =

melting point than traditional lead-based solders. By subjecting the  =

solder to an alternating magnetic field, the solder can be selectively  =

heated. This keeps surrounding materials at safe temperatures while  =

melting only the solder itself.

Third, an external magnetic field can be used to remotely manipulate  =

the solder, so it can be moved into hard-to-reach places, such as  =

narrow vertical channels. This means that broken connections within  =

devices can be =93self-healed=94 by applying a magnetic field to melt the  =

solder and attach the ends together.





-- =

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