Melt ejection dynamics
The movement of molten metal under the influence of process gas or water jet during welding. Poor dynamics leads to drooping and sticking.
Physical-Chemical Mechanism of Action
Melt ejection dynamics describes how the molten metal moves in the cut area under the influence of process gas or water jet. Optimal dynamics ensure a smooth flow of material and prevent adhesion.
Metallurgical Relevance & Welding Risks
Poor melt ejection dynamics can lead to dross formation on the underside of the workpiece. This can impair weld quality and cause cracking. It can also cause uneven deformation or excessive cooling stress, which negatively affects the microstructure.
Workshop Practice & Instructions
To ensure good melt ejection dynamics, pay attention to the proper setting of the process gas or water jet. The jet should support the metal flow and be uniform. For TIG welding, good gas flow is crucial. For MIG welding, an appropriate nozzle ensures optimal dynamics. For front dross, consider water jet density and velocity.