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Filler material is drawn into the gap between the<br />
metal pieces to be joined by capillary action <strong>and</strong> the<br />
bond formation is initiated when the molten filer<br />
metal comes under intimate contact with the solid<br />
surface as in solid state welding.<br />
The nature of bond formed is much complex here,<br />
<strong>and</strong> invariably there is some degree of intersolubility<br />
between filler <strong>and</strong> base metals.<br />
This inter-diffusion inter diffusion at the base metal surface <strong>and</strong><br />
resulting alloy has a strength which is very close to<br />
that the base metal.
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