For metallized film capacitors with requirement of high capacitance accuracy and small rated capacity

assurance of stable capacitance and prevention of attenuation

in addition to strict control of winding and heat setting processes

also need to pay attention to the influence of subsequent processes on capacity attenuation of capacitor

especially the element welding process which is easy to be ignored. It is proved in this paper that welding process has a significant influence on capacitor capacity attenuation through the comparative test of the relationship among different welding power

welding fastness

capacitance attenuation and loss tangent.