Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Soldering Lead Composition?
Q. Can we use soldering lead 60/40 instead of 63/37 for our PCB/Electronic assemblies? will there be any difference in performance?
Vetrivel [last name deleted for privacy by Editor]PCB assy - Bangalore, Karnataka, INDIA
2004
A. If you are hand soldering, using 60/40 is generally OK. It is often used when doing repairs. The soldering irons will have to be hotter due to the higher melting temperature of 60/40. Also it will take a little bit longer on each joint and the joint MUST NOT be disturbed for a longer time after the solder iron is removed. If you are wave soldering, 60/40 doesn't work well because it doesn't solidify all at the same time; as it cools it becomes like a paste for a short time during which the joint MUST NOT be disturbed. If you are hand dip soldering, you can often get away with 60/40 but the extra time and care needed usually cost more than the saving from the cheaper solder.
Tom Gallant- Long Beach, California, USA
2004
Q. What is composition of soldering lead?
Jeffrey G. Lopez- Los Bażos, Laguna, Philippines
June 6, 2013
A. Hi cousin Jeffrey. I think Tom implied that the answer is 60/40, which means 60% tin and 40% lead. If this is not the answer you were seeking please re-word your question because then I'm not quite understanding it. Good luck.
Regards,
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
June 10, 2013
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