Mechanics of drop transfer for high-current density MAG welding process

With the help of high-speed camera, the fundamental character of high current density MAG welding process with two types of conventional shielded gas is analyzed.The influence of wire extension and shielded gas component on the second critical current is researched.So the mechanics of drop transfer of high-current density MAG welding process is disclosed, which is centrifugally breaking transfer, mixed transfer and rotating short transfer.Moreover, the reason of why high-current density MAG welding process with the shielded gas of 80%Ar and 20% CO₂ cannot be used is found.The application practicability of high effective welding for high-current density MAG welding process with the shielded gas of 98%Ar and 2% O₂ is built.