SMA preheating concerns

The problem to be concerned during SMA preheating, the preheating temperature selection in SMA wave soldering should consider not only the activation temperature required by the flux, but also the preheating temperature required by the SMC/SMD itself. Preheating in advance, wave soldering SMC/SMD will not have an instantaneous intense thermal shock, and when using a higher preheating temperature, the wave soldering temperature can be reduced, which is also beneficial to reduce thermal damage. Generally, the preheating temperature selection principle: the difference between the temperature of the SMA after passing through the preheating zone and the temperature of the solder wave soldering is preferably 100 ° C or less.