Re: [Z_Scale] Re: Converting an AZL SD-40-2 to a SD-38
- Brazing is or used to be used for high quality bicycle
frames before they were made from titanium and carbon
fibre. The stresses at the lugs were pretty high -- I
can't imagine brazing being used with anyting Z.
--- Michael Hilliard <mchwilton@...> wrote:
> Since I've seen some AZL's not completely painted
> inside with some solder joints exposed and the color
> being grayish silver in color (probably discolored
> from laquer clear coating), I "think" it's safe to
> say they are soft soldered or hard silver soldered.
> Brass of this size would never be brazed and I
> believe Manfred you are refering to silver bearing
> solder rather than true silver solder that is used
> for hard soldering. I dought but it is possible they
> are hard silver soldered, but to me it would make
> more sence to brass hard solder, to keep color
> uniform, but this does not appear to be the case.
> Hard silver solder is as hard as silver but with
> additives to slightly lower it's melting temp. Brass
> hard solder is usually the same hardness as brass
> but also contains additives, including gold, to
> lower it's melting temp. It is usually sold in small
> thin sheets that are then cut into 1mm squares, or
> in paste form. After fluxing the joint to be applied
> to the small sq. of solder is melted with a torch
> (micro torch) and picked up with a titanium solder
> pick. Then the joint is heated with the torch and
> the solder is placed on the joint til it melts and
> flows to the heat of the torch. Great care must be
> taken to melt the solder but not melt the pieces
> being soldered. The end result is a bond as strong
> as the brass itself or if silver is used a little
> softer but still much harder than soft
> silver/tin/etc. based solder that melts with a
> soldering iron.
> Correct me if I'm wrong, I'm not a experienced
> brazer, but brazing involves a brazing rod that is
> the metal (solder) to use to make the bond, also
> requires a torch and high temps, but also slightly
> melts the edges of the metal to be bonded.
> Saying all this, it is likely they are soft soldered
> (low temp.) but they could be high temp (1150 - 1365
> degrees) silver soldered, I wouldn't rule this out.
> Just my addition to this topic,
> Michael Hilliard
> "M. G." <afn47583@...> wrote:
> Brazing is a much higher temp process. I doubt that
> they will be brazed.
> Maybe silver solder which is higher temp then
> regular solder but still
> lower then brazing. In strength the regular
> soldering is the weakest but
> still way strong enough for our little trains. The
> brazing would be the
> strongest but overkill and probably very difficult
> to do with the thin
> brass involved since the brazing rod is also brass.
> If you've ever
> chased holes in rusty sheetmetel with a welder then
> you know what that
> would be like.
> Manfred G
> -Z- WARNING! HANDLE WITH CARE! Highly addictive in
> Small DoseZ!
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