CNC 4-head welding machine

4-head CNC welding machine with 3 controlled axes, designed for horizontal and simultaneous welding of the 4 corners of a Pvc frame; ensures the frame manufacturer with constant operating quality over time.

It automatically performs all the necessary operations, positioning at the welding positions, cyclical fusion, compression and cooling and, at the end of the process, it releases the frame on conveyor belts towards the cleaning area.

5 Reasons to choose the SL4-U

It divides the cutting offsets of the profiles on all 4 welding corners.

Electronic temperature control combined with the profile code.

High technology for maximum precision: Movements on linear guides and rack.

Quick replacement system for welding countershims.

User Friendly technology.


  • Length (A)

    5.250 mm
  • Width (B)

    2.200 mm
  • Height (C)

    1.650 mm
  • Weight

    3.000 Kg


  • Installed power

    12 Kw
  • Supply

    400 V
  • Air consumption per cycle

    180 Nl/min
  • Minimum Operating Pressure

    7 bar
  • Operators



  • Welded frames/8h*

    Up to 240

* Dependent on the types of profiles and gaskets to be processed.

Weldable Profile Dimensions

  • Height

    40 ÷ 180 mm
  • Width

    40 ÷ 130 mm

Weldable Frame Dimensions

  • Maximum

    3.200 x 2.800 mm
  • Minimum

    400 x 400 mm


4 Heads Quad


  • Horizontal and contemporary welding of the 4 corners.
  • C-welding.

Upon request the machine can be equipped with:

  • Welding on 3 sides.
  • Welding on 3 sides with supports for threshold assembly.
  • Cooling table.
  • Kit for performing parallel welding.
  • Automatic weld bead change kit between 0.2÷2 mm: Possibility to automatically set the weld bead according to the geometry and color of the profile to be welded.
  • Kit of Knives in steel SL4 U.
  • Heated Knives.
  • Profile exit belts.
  • Automatic temperature change and Energy Saver option.
  • Axis brushless motors.
  • Up-down gasket-presser with standard feet.
  • Bar code reader Radio CCD.
  • Possibility of connection in line with Graf Synergy corner cleaning machines.