Abstract: An array of boxes in one or more carts is closely associated with addresses in a database of a computer. This computer-box association is used to keep track of the sequence, placement and presentation of each window frame element to each workstation. This association is maintained until these frame elements are assembled into rectangular window frames. Then, individual window frames are tracked into other workstations using bar code labels. Temporary storage of frame elements between workstations constitute work banks to each workstation. In another aspect, the lengths of frame elements are adjusted to compensate for the melt factor of the specific welding head in which a joint will be made.

Abstract: An array of boxes in one or more carts is closely associated with addresses in a database of a computer. This computer-box association is used to keep track of the sequence, placement and presentation of each window frame element to each workstation. This association is maintained until these frame elements are assembled into rectangular window frames. Then, individual window frames are tracked into other workstations using bar code labels. Temporary storage of frame elements between workstations constitute work banks to each workstation. In another aspect, the lengths of frame elements are adjusted to compensate for the melt factor of the specific welding head in which a joint will be made.