Pete,

Are you sure the bushes aren't dip brazed into the casing?

What are the bushes made from?

Is there any plating on the casing, anodising, alochrome - obviously you'll
have to remove it in the area of the joint.

The alloy composition could be important as some aircraft type alloys
contain unusual alloying elements including copper. Using a disimilar
material to make a joint could lead to galvanic corrosion.

Regards,


>
>
> Hi, T-Nagers,
>
> I have a repair job to evaluate that involves replacing damaged filters
>  in
> a 10 year old unit, not of our making. The filters appear to be shouldered
> with coaxial leads for soldering wires onto. The filters themselves are
> inserted into holes in a machined aluminium alloy casing 3 to 4 mm thick
> until the shoulder butts up against the casing wall. From there, they
> appear to be hand-soldered in place. I have no information concerning
>  the
> type of aluminium (if that's relevant), but the solder fillets securing
>  the
> filters are well wetted onto the casing wall.
>
> Does anyone have any suggestions about suitable fluxes and solders that
>  I
> can use for this job, and whether your choice of flux is water or
>  solvent
> soluble?
>
> TIA and best regards
>


Eric Christison

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