Measurement of post-welding shift for to-can pigtail package

Abstract

B y using non-contacf capacitive sensors lo measure post-welding shifr (PWS). the effecfs ofexternal pre-load on weldingparts and variation of welding spot location on PWS are studied. The importance ofstructure and mechanical tolerance ofweldingparfs is also discussed.

Investigation into transient characteristics of post-welding shift for opto-electronic pigtail package

“…It indicates that the movement of sleeve depends not only on the weld spot position but also some other factors like sample geometry, interface friction, interface mechanical quality and the equivalent pressure due to the external loading at the interface. It is noticed that if an external loading higher than 2 kgf is applied, the PWS can be controlled within a micrometer [6].…”

“…The sensor signal in the first 8ms is affected by high voltage discharge during the laser welding process and its reading does not represent actual PWS. Details of the experimental setup and the sensor operating principle are discussed in previous studies [5,6].…”

“…Although PWS is a dynamic process, previous studies mainly focus on static measurement [2,6]. Among the various interesting findings, a common characteristic is the scattering of measured data.…”