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Soldering Neck Strap Hook

2516 Views 12 Replies 6 Participants Last post by  JerryJamz2
Hi --

I want to add a neck strap hook to a vintage Soprano sax that I am overhauling right now. Will standard tin/lead soft solders do the job or do I need to silver-solder it to get the required strength? (I got a butane torch)

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Some lacquers are super-sensitive to heat.

Although I like the 96/4 solder, I think Jerry exaggerates a little.

The tensile strength of 63/37 is 6700 PSI

The tensile strength of 96/4 is 14000 PSI, around twice that of the lead solder.

Nevertheless, where strength is sought, there is a decided advantage.

The flow temperature of 65/37 is 361 degrees F.
The flow temp of 96/4 is 430 F.

To me, that is significantly higher, in the situations where the lacquer is of a type that has a high risk of burning.

An advantage of the 96/4 is that it is far more resistant to corrosion than the lead solder, so it retains a bright, silvery appearance, which is a cosmetic advantage on silver plated instruments.

I know that an expert has said that mixing these two is quite OK. However in the absence of my own serious testing, I am just a little sceptical. Certain brands of flute, especially Hernals, have had a problem of the post rib near the D key peeling up. I found that when I used 95/5 (very similar to 96/4) the result SEEMED to be quite brittle and unreliable. Perhaps it had something to do with the original solder the manufacturer used. Perhaps it had something to do with the seemingly extra high nickel content in the bodies of those flutes. In these cases, I eventually had more success using 63/37. One of those mysteries of the world.
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axetech said:
"The flow temp of 94/6 is 430 F."

I think you are talking about 96/4 it melts and flows at 430....
Thanks for the correction, Carl. I've corrected my typo to save confusion.

"50/50 flows at 421 so not much difference...."

I don't think may people would be considering 50/50 where lacquer is involved, because of that higher flow temp.
Before this thread gets too scary...

My memory was just as bad decades ago, BEFORE I started breathing in leaded car exhaust.

Lead at room temp evaporates very, very slowly. And there is very little solder open to the air on a sax. Nor does the player make much skin contact with the solder. So I doubt a player would absorb a significant from using a sax with lead-soldered parts.

On the other hand, a technician doing a LOT of soldering, in an unventilated room, is dealing with higher temp lead, and may well be subject to more vapours.
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