严禁对圆柱型晶振金属外壳焊接的原因是什么？

Soldering on the body of the cylinder type crystal unit must be strictly avoided due to deteriorate the characteristics or damage the products.

我们必须严格避免在圆柱型晶体单元的主体上进行焊接，因为焊接高温可能使晶振产品内部的电气特性变差，严重时直接造成晶振损坏。

Lead wires of the cylinder type crystal unit should be soldered within 3 seconds with the iron heated to a temperature no higher than 380℃.

针对圆柱体晶振的引线进行焊接作业时，电烙铁温度不可高于380℃，焊接时间不可超过3秒钟。