Automatic welding line for side and end wall sheet panels

An automated welding complex for assembling and single-side arc welding side and end wall sheet panels of hopper wagons — with back-side seam formation in a CO₂ shielding environment and guaranteed joint quality without tack welds.

How it works

1. Sheet receiving and positioning. Powered roller conveyors receive the sheet, align it against longitudinal and transverse stops, and feed it into position using pneumatic pushers.
2. Clamping without tack welds. Clamping beams fitted with a pneumatic finger-clamp mechanism (24 clamping fingers per beam, 130 mm pitch) evenly press the sheet edges onto the copper backing bar, maintaining a precise 2 mm process gap.
3. Single-side welding with back-seam formation. The welding carriage travels along a guide rail at an adjustable speed of 0.6–108 m/h, carrying a MIG/MAG TPS 5000 semi-automatic welder with a torch adjustment mechanism. The back side of the weld is formed by a cooled copper backing plate under CO₂ shielding gas.
4. Panel removal. Once welding completes (tracked by a limit switch), ball supports lift the panel to protect the backing plate from wear, and the panel is transported further along the process line by conveyors.

All operations are controlled from a portable pendant — the operator selects the mode (“Part Setup,” “Welding,” “Transport”) and visually monitors the welding process, adjusting torch position along the seam as needed.

Why this solution works

• Consistent weld quality — rigid tack-free clamping and a precise process gap eliminate distortion and incomplete penetration.
• Automation of a labor-intensive step — reduces dependence on welder skill and improves repeatability from panel to panel.
• Flexibility across sizes — pivoting stops and height-adjustable conveyor supports accommodate different panel dimensions, including sheets with lead-out plates.

Technical specifications: