Many controls are capable of monitoring and storing the actual weld parameter data generated during a weld. We are talking about the actual weld current, voltage, displacement and any other parameters. This data is maintained for a finite period of time in the control. At the end of this time it is erased or can be downloaded for storage.
Downloads can be to storage devices such as flash drives, or transferred by Ethernet, and other transmission systems, refer to “Can controls network and communicate with automation systems”. It can be collected each weld or by shift or day as desired. In the course of a day a lot of data can be collected.
Reference: RWMA - Resistance Welding Manual 4th Edition