The test results indicate that cooling beginning temperature after brazing is most influential to its joint strength, then the cooling hours and finally the way of dehydrating before brazing.

It should be payed much attention to fast cooling because it can decrease the defects of PCB assemblies and promote the reliability of solder joint.

The reason for preventing the weld joint from cold cracking with this kind of insulator to keep the weldment cooling slowdown is discussed also.