TWI Frequently asked questions
by Colin McLean
Solders provide a metallurgical joint that has good electrical and thermal conductivity. Solders can be tolerant of component placement or process variations. They are re-workable and the soldering process is easy to automate.
However, solders require relatively high temperature processing, around 240° to 260°C compared with around 150°C for adhesives. Also, the lead used in many solders is toxic and elimination of its use is required by legislation in certain countries.
The structural integrity of solder joints can be detrimentally affected by fatigue and creep. Thermally-induced mechanical fatigue and creep relaxation caused, in particular, by temperature cycling can lead to the initiation and growth of cracks and consequent joint failure.
Further information
Also see FAQ: Can I replace solder with epoxy as an attachment material?
