The AII-B4 arc welding robot utilizes a streamlined, through-arm coaxial cable, which allows for maximum mobility in tight workspaces. This robot is highly versatile at welding in confined spaces or complicated fixtures.The coaxial cable of the AII-B4 also helps improve wire feeding, which helps improve overall weld quality. AX21 Robot Controller Base The AII series robots are powered by the new AX21 controller, which features improved resistance to heat and dust, improved reliability in global environments, improved reliability and maintainability, increased sampling frequency for higher detection accuracy, and more.