Testing and Analysis of High-Speed Camera for Droplet Transition

Abstract

The droplet transition of electrical arc welding is a complicated process that combines heat, mass and momentum transfer. A high-speed camera system with laser in the background is established to observe the fast changing process of molten droplet transition. A group of high-speed camera pictures which indicate the droplet gravity center is unstable in welding metal transfer process are taken and analyzed. The experimental results show that the electromagnetic force is the unstable root of the droplet gravity center.

Metal transfer and arc behaviour of novel consumable and non-consumable electrode indirect arc droplet welding

“…Compared with other methods, high speed imaging has been widely used in studying the metal transfer for it can directly record the droplet transfer processes and the arc behaviour. [18][19][20] In this paper, the metal transfer and welding arc behaviour of CNC-IADW were studied by the high speed digital camera system. The emphasis was placed on the analysis of the metal transfer characteristics and arc stability during the indirect arc's burning.…”

“…With the development of welding technology, all kinds of sensing technologies such as sensing of sound, sensing of welding arc voltage, sensing of arc radiation and high speed imaging have been developed. Compared with other methods, high speed imaging has been widely used in studying the metal transfer for it can directly record the droplet transfer processes and the arc behaviour 18 –. 20…”