Metal transfer instability in gas metal arc welding
- Resource Type
- Authors
- S. W. Simpson
- Source
- Science and Technology of Welding and Joining. 14:262-273
- Subject
- Heat-affected zone
Materials science
Drop (liquid)
Metallurgy
Welding
Mechanics
Condensed Matter Physics
Electric resistance welding
law.invention
Gas metal arc welding
Physics::Fluid Dynamics
Plasma arc welding
law
General Materials Science
Cold welding
Arc welding
- Language
- ISSN
- 1743-2936
1362-1718
This work presents a simplified model of metal transfer in gas metal arc welding. The model incorporates key features of metal transfer including the change in droplet diameters as welding moves from the globular into the spray metal transfer region, and the increase in welding voltage that is observed to occur as the pendant droplet grows. The model predicts that an instability arises in the globular metal transfer region, which leads to deterministic chaos and complex limit cycles with many droplet sizes. The instability also causes deterministic chaos with a characteristic gap in droplet diameters at the transition to spray mode metal transfer. The model explains observed features of metal transfer in some detail, including the existence and location of preferred bands of droplet sizes. Whether the instability is present or not defines the boundary between chaotic globular metal transfer and the stable drop spray transfer mode. The identification of deterministic chaos in gas metal arc welding ...