|   Solder type...point of information.... | Resident Loser
Apr 10, 2001 10:41 AM | | ....eutectic: of an alloy or solution: having the lowest melting point possible. You can look that up in yer' Funkin' Wagnalls. Nothing magic, a regular everyday(well, maybe not every day)word.
The following is from: http://www.multicore.com
Sn__Pb__Ag__Solidus-deg.C__Liquidus-deg.C__Uses
60%/40%/00%____183____________188______Electrical
63%/37%/00%____183____________183______Wave
62%/36%/02%____179____________179______Silver plated surfaces
...and from the Multicore glossary:
Eutectic: The proportion of metals in an alloy that results in the lowest possible melting point for that alloy. In tin/lead solders, the eutectic is 63%Sn/37%Pb.
Eutectic Point of Solder: Melting point of solder with 62%tin and 38%lead alloy. It has the lowest melting point of any solder alloy proportions.
This part is mine:
Take all the information presented contextually. There is no magic! The 63/37 ratio is just another manufacturing parameter re: wave soldering!!! Anything else, while not to be dissmissed as totally irrelevant, is strictly a by-product and not cause for joyous reverie throughout the land. Whether or not it is instrumental in reducing the use of lead is debateable; it most certainly is not based on any superior "electrical" properties...sonic or otherwise.
At the risk of repeating myself, a cold solder joint is the sign of a poor craftsman, and not the product of a five degree temperature difference.
jimHJJ(...yeah, I know the manufacturer is all wet...) |
| re: Solder type...point of information.... | lanwanman
Apr 10, 2001 2:02 PM | | "At the risk of repeating myself, a cold solder joint is the sign of a poor craftsman, and not the product of a five degree temperature difference."
To the guy that taught me to solder (along with 15 or so other of the luckless), a cold solder joint was nothing less than an opportunity to question the intellectual ability of the maker of the cold joint, often resulting in unfavorable comparisons of the IQ of the offender to that of any generic, frozen pile of canine excrement. He was...ah....colorful. I still cringe mentally whenever I have to solder something, but I damn sure never leave a cold solder joint.
(...yeah, I know the manufacturer is all wet...)
They simply need to spend a little quality time at one of the high-end audio re-education camps. The dialectic teaches us that all can be heard but that nothing can be measured. |
| re: Solder type...point of information.... | Jon Risch
Apr 10, 2001 8:31 PM | | Geeezz!
Note the solidus/liquidus points.
Notice that 63/37 has the SAME number, that is, it goes from liquid to solid, BOOM!, in a very short temperature swing. So does 62/36/2 silver alloy.
The five degree C range that 60/40 has where it is 'plastic', rather than purely liquid or purely solid, is what makes the difference.
If the solder joint moves, or is vibrated or ANYTHING within the time it takes to cool those five degrees, then the solder joint is compromised. Within the plastic range, movement or vibration causes the solder to partially crystalize and shear internally. Bad!
Try getting a small tube of 63/37 Kester 44 flux, or some 63/37 Ersin, and soldering with it. If you can make a good solder joint with 60/40, these are a snap, and result in beuatiful solid joints every time.
Just one more way the hobbyist can try and assure that his DIY project works well the first time. Hard as hell to re-heat a cable connection without it playing havoc with the wire and plug insulators!
Jon Risch |
| re: Solder type...point of information.... | Bruce Burke
Apr 11, 2001 7:50 PM | | As was previously stated, the 5 degree C difference is nearly meaningless when considering it's percentage to the actual temperature, especially when also considering the thermal mass around most solder joints.
You're much more likely to get a cold solder joint from contamination than from jiggling a connection during cooling. Even more common is the overheating of the joint by using a cheap unregulated iron. Those reach in excess of 1000 deg. F and will ruin more solder joints than make good ones.
Companies use this combination because it saves them big energy bucks in their manufacturing process.
Like anything else, soldering take a little practice and attention to the right details. |
| re: Solder type...point of information.... | Resident Loser
Apr 12, 2001 10:22 AM | | ...in adddition to the info in this post, I have been party to a series of posts containing said information and other bits of arcana.
The main thrust, I had hoped, would have been to indicate what I see as a troublesome thread that runs through some of Mr. Risch's (and others)posts.
There seems to be the inference that certain "products" or objects, have as their primary reason for existence, properties which would be best suited to secondary or even tertiary applications. In fact, in some cases, the term "accidental by-product" would be more apropos. Sometimes I feel the Good Lord allowed sand to be, not so much as the detritus of sea life, but specifically to be put in bags and then used to quell spurious resonances and vibrations in certain stereo components....
Any serious hobbyist looks outside the obvious sources etc. for parts and materials for their particular interest. We see too little of that type of creativity and ingenuity; however, I sincerely doubt my use of a dressmakers pattern tracing wheel as an embossing tool with which I replicate a rivet detail on my model railroad, to be considered its' primary purpose.
jimHJJ(..notoriety comes with a certain responsibility...) |
| re: Solder type...point of information.... | Tom N.
Apr 12, 2001 2:58 PM | | Realy?
What do you model? I'm just getting back into model railroading after a many year lapse.
Tom N. |
| HO.... | Resident Loser
Apr 13, 2001 8:48 AM | | ...not timeframe specific as I like motive power and rolling stock from many eras, steam to diesel. All freight, no passengers. Keystone Shay to an EMD DD-40, and lots in between.
Mostly Athearn and the like, not into the $2k Shinohara brass, sure is pretty though. Scratchbuilt structures and such. Some, but not much sceniking.
My layout is a switch yard, just enough track to juggle consists.
jimHJJ(...wish I had my old American Flyers, nothing fancy, just wish I had 'em...) |
| re: Solder type...point of information.... | mtrycrafts
Apr 12, 2001 11:44 AM | | >>>the 5 degree C difference is nearly meaningless <<<<
I seriously doubt a 0 deg C diff. would be meaningless to JR. |
| Hey Jon, would you send mtry an autographed photo! | HTguy
Apr 12, 2001 6:28 PM | | I think mtry has a secret crush on Jon. He seems to bring his name up in every thread. Why don't you two get a room or something. |
| Hey Jon, would you send mtry an autographed photo! | mtrycrafts
Apr 12, 2001 9:17 PM | | >>>every thread<<<<
I suppose you can substantiate this, right? Or, just causing trouble following me around like a good little puppy. Stay close now, don't get lost. |
| Hey Jon, would you send mtry an autographed photo! | HTguy
Apr 13, 2001 7:56 AM | | Hit a little to close to home, eh mtry? Getting worked up 'cause someone's onto your secret fetish. I just crack up 'cause you're sure your opinion means more than his. You know what they say about opinions, don't you? |
| Hey Jon, would you send mtry an autographed photo! | Rockwell
Apr 13, 2001 10:15 AM | | That offereing opinions better than trolling? |
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