Electronics > Beginners
Solder mixture - 60/40 67/37
tkamiya:
Although I've been in electronics for over 40 years, I never gave much thought to solders. Now I'm wondering about something I'm sure many of you know....
Common lead-tin solder comes in 60/40 and 63/37 mixture. What is the difference between the two. Sure, melting point is a bit different by 5 degrees, but that's not much to make two different products. There got to be more to it.
I've been using them interchangeably. Can anyone share the secret?
sleemanj:
63/37 is eutectic, it melts and solidifies at a fairly precise temperature, in other words the transition from melted to solid happens much more quickly, "melty...solid" instead of 60/40 which is more "melty...a bit less melty... a little bit solid... getting pretty solid... ok we're done"
Simon_RL:
--- Quote from: sleemanj on January 18, 2020, 11:43:10 pm ---63/37 is eutectic, it melts and solidifies at a fairly precise temperature, in other words the transition from melted to solid happens much more quickly, "melty...solid" instead of 60/40 which is more "melty...a bit less melty... a little bit solid... getting pretty solid... ok we're done"
--- End quote ---
So for noobs 60/40 is definitely the better option as it is more forgiving.
Moshly:
--- Quote from: Simon_RL on January 19, 2020, 02:52:43 am ---
--- Quote from: sleemanj on January 18, 2020, 11:43:10 pm ---63/37 is eutectic, it melts and solidifies at a fairly precise temperature, in other words the transition from melted to solid happens much more quickly, "melty...solid" instead of 60/40 which is more "melty...a bit less melty... a little bit solid... getting pretty solid... ok we're done"
--- End quote ---
So for noobs 60/40 is definitely the better option as it is more forgiving.
--- End quote ---
Technically no, 60/40 has a longer time in the plastic (melty) state as its cooling down so the joint has to remain still for longer as you will get a dry joint if moved. For hobbyist it does not matter as you normally hold the part and watch the solder solidify before continuing.
tooki:
--- Quote from: Simon_RL on January 19, 2020, 02:52:43 am ---
--- Quote from: sleemanj on January 18, 2020, 11:43:10 pm ---63/37 is eutectic, it melts and solidifies at a fairly precise temperature, in other words the transition from melted to solid happens much more quickly, "melty...solid" instead of 60/40 which is more "melty...a bit less melty... a little bit solid... getting pretty solid... ok we're done"
--- End quote ---
So for noobs 60/40 is definitely the better option as it is more forgiving.
--- End quote ---
No, the exact opposite: 60/40’s plastic phase is a wider window of time during which the joint can be disturbed. This makes it LESS forgiving of movement during cooling.
60/40 is used because it is/was slightly cheaper, which mattered for mass production. But nowadays they usually cost the same, and IMHO there is no reason whatsoever to choose it over 63/37.
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