> John Chung yahoo.com> writes: > > Yup the paper talks about the right temperature too. If memory serves > > me correctly it is 375 celcius. But it > > really depends on the lead free solder material. My boss tells me the figure discussed at the conference was 150C, i.e. just= below melting point. > 375 degC is about 100 degrees above what any normal component can take. > You could spot weld it or ultrasound weld it just as well and likely with= less > thermal damage. Also rohs alloys are extremely fragile in composition. Ju= st a > touch with a soldering iron with another alloy's remains on it is enough = to > compromise the very delicately tuned "low" melting point of it. ROHS alloys composition extremely fragile? Yeah? Who you been talking to? They have had a problem with whiskers and dendrite growth, but with other t= race metals in the alloys these are now well sorted. Otherwise the alloy is= no more fragile than tin/lead composition. Modern manufacturing techniques= mean that maintaining a percentage of each alloy is well controlled. --=20 Scanned by iCritical. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .