Anode stub repair is a routine task for the rodding plant at all prebake aluminium smelters. Many different techniques have been applied, with varying degrees of success.
VHE of Iceland has a proven technology which ensures mechanically and electrically secure repairs with reasonable capital investment and low operating costs. A customised band saw removes damaged stubs which are then replaced by an automatic MIG welder.
VHE Automatic MIG Welder for BALCO - India
VHE's innovative automated stub saw machine uses band saw technology, resulting in energy conservation, noise reduction, cleaner cut surfaces, and easy and inexpensive blade replacement. The saw cut stubs horizontally whilst the rod remains hanging in the overhead conveyor.
The VHE stub saw provides a low-energy consumption, low-noise solution. The smooth and precise cut surfaces enable excellent control of the MIG welding process, producing mechanically strong joints with significantly lowered electrical resistance.
The system can be designed to enable the selection of up to three cut lengths on any combination of the stubs on each anode rod. After cutting, the rod moves on the overhead conveyor to the automatic MIG welding station, where the correct length of new stub is welded in place.