Lay the metal sculpture pieces to be combined on a heat-resistant pad, and test-fit each joint. There should be at least a quarter-inch of overlap between the sculpture components at each joint.
Clean each overlapping metal piece with an emery cloth to remove any surface impurities that can interfere with the brazing process. Rub the pieces with the cloth until they are shiny.
Paint a thin layer of liquid flux on each overlapping sculpture component. The flux will burn off during brazing, leaving behind a clean, de-oxidized environment for the brazing wire to fill.
Clamp the sculpture pieces together in the desired position, and put on a welding mask and welding gloves.
Turn on your oxygen-acetylene torch, and heat the metal sculpture pieces (not the joint itself). Hold a brazing wire against the joint on the opposite side of the torch. When the wire begins to melt, move it slowly around the joint, filling the joint area with the wire.
Allow the sculpture to cool completely before unclamping and brazing the next component.