Stainless steel wedge wire screen welding machine for liquid filtration The wedge wire screens made by wedge wire screen welding machines are all custom made and can be designed and built to fit screening equipment with specified width and length. Not only applied in coal mining industry, the wedge wire screen welding machines can also be used in food processing, waste-water filtration, pulp and paper as well as mineral processing applications. With the help of the wedge wire screen welding machines, solid/liquid separation can be easily managed.