Dynamic Behaxior of Gas Metal Arc Welding

Gas Metal arc Welding (GMABQ has become the most addely used process for joining of steel plates due to its high productixity, simplicity of equipment and ease of use. Although the process of melting of the electrode and development of the weld deposit has been studied for 40 years, the dynamic nature of the process has not been studied in detail because accurate models are computationally intenshre and experiments t o measure what is occurring in the arc are difficult due to the intense heat and light. In this presentation, the fundamentals of the GMAW process will be reviewed, followed by a detailed description of droplet formation and detachment followed by current studies of fluid behavior in the weld pool. It will be shown that fluid motion both within the drop and the weld pool has a significant effect on the quality of the weld produced.