The workpiece positioner with counter bearing has two vertically arranged faceplates. The workpiece fixture is mounted between the two faceplates. Thus, heavy or long workpieces can be perfectly positioned and welded. The two components of the workpiece positioner are mounted on the shop floor. As an option, the workpiece positioner can be mounted on a common base frame (WP-TC-F). The counter bearing can be moved on the base frame manually (WP-TC-M) or by a motor (WP-TC-E). Thus, the distance between the two faceplates can be adjusted according the different workpiece sizes.