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Gantry Automat GWU Builder

Machine is suitable for working in heavy industry, especially by welding of tanks of different types in the mode of 7/24. The whole unit is suitable for welding pressure and non-pressure high capacity tanks. Wide range of options and advanced digital technologies which are easy to operate for SAW, MAG, TIG, PLASMA WELD methods of welding and KEY HOLE proces.


This is a special solution which is provided only as custom made. Due to the complexity of the whole system and its parts very thorough consultation of requirements is always necessary. The final technical solution and possible feasibility of the project is provided as special project solution and always exactly based to the parameters of the required products, specific applications or the customer production program.



  • GWU BUILDER is sophisticated industrial production unit for circumferential and longitudinal welding of high capacity tanks with maximal diameter up to 5000mm. Lenght can reach 25000mm. Weight of welded product is depended on the choice of roller positioners or assembling line

  • Mechanical construction of the machine is spacial and consists of two massive towers (GANTRY). Bases of both towers are a bit wider and therefore are stable and used as a platform for placing the generators up to 500Kgs. Right tower is equipped with ergonomic place for the operator which is protected against the fall of welded part by special frame. The whole system of both towers is movable along the rails, synchronized motors with maximal speed of 4,0m/min are used. Between both towers there is heighly adjustable portal of aluminium construction by which one or two torch heads are carried.

  • Torch heads are precise set for the mechanical point of view by which micromovement axises X and Z are integrated and in case of MAG method also the pendel unit. Both axises (X+Z) can be moved in the range of +/- 100mm in each direction, pendel unit 20mm for each side. Considering the fact which welding technology is used another suitable options are added to basic configuration. Feeders and coils of the wire are integral part of the support as well as the systems of recycling and adding the flux.

  • GANTRY BUILDER can be connected with roller positioners CARRIER and build sophisticated production complex of the highest technological level.

  • On the system digital industrial camera IRIS NICK can be mounted by which the focused shot of the place where is the welding performed is taken. This camera is suitable for any method of welding, including MAG PULSE method, and quarantees great results. Another camera is recording the whole working place from the top and enables the operator to find the most optimal welding position.

  • Control system is based on industrial computer (Windows platform) by which the visualization of advanced user interface HST CREATIVE is arranged and seen on 19“ display equipped with reliable Touch screen technology with glass surface. Controlling of modes by touchscreen, proportional digital joystick, context offer, use of touch commands, digital system of automatic control of welding position by touch sonde.




Main benefits

√  Sturdy construction of two towers without material flickers brought into the process of welding, mechanical defects of welding are eliminated

 Small dimensions of floor projection because of the compact solution of construction and small requirements for the space on the workshop

  Possibility of two technologies at the same time (for example MAG + SAW)

  Movement of the machine along the rails that means that the unit changes its position for longitudinal welding

 Micro movement axises without pressure with accuracy of positioning of 0,2mm, technical parameters of welding displayed on the display

 Precise positioning of 0,1mm by the operator by proportional joystick or system of controlling the welding position by touch sonde

 High – tech industrial computer system of welding process controlling through the touchscreen display and controlling by commands

√  Recording of welding process by digital camera which is complemented by another camera placed above working place

 Safety stand of operator in covered moveable working station




Progress speed of the cylinder placed on pulleys *

 0,74 - 369,0 cm/min

Torque on shaft of roller positioners *

Based on the type of positioner

Speed of movement of the machine along the pulleys (Y axis)

  0,5 - 450,0 cm/min

Movement of the torch head (X axis) *

0,01 - 200,0 cm/min

Vertical movement of the torch head (Z axis)

0,01 - 150,0 cm/min

Horizontal movement of the torch head (C axis)

0,01 - 150,0 cm/min

Pendel of the torch *

+/- 20 mm

Maximal loading of the torch head by components of welding technoloqies

130 Kgs

Maximal loading of pendel head by welding torch

5 Kgs

Duty cycle **



Maximal diameter of welded cylinder up to 5000,0 mm
Minimal diameter of welded cylinder (special adjustments on request*) 1350,0 (800,0) mm
Maximal efective lenght of the movement along pulleys 25000,0 mm
Stroke of the central portal 2270,0 mm
Rotation of roller positoners (HST CREATIVE CARRIER) Controlled axis
Movement of the machine along pulleys  (Y axis) Controlled axis
Stroke of the portal (L axis) * 2270,0mm, controlled axis
Movement of the torch head along the portal (X axis) * controlled axis
Vertical movement of the torch head (Z axis)  +/- 100mm, controlled axis
Horizontal movement of the torch head (C axis)  +/- 100mm, controlled axis
Rotary movement of the torch head (R axis)  90°, manual axis
Pendel of the torch  +/- 20,0mmcontrolled axis
Suitable methods of welding SAW, MIG/MAG, TIG, Plasma Weld
Maximal amount of welding heads 2
Flux suction for SAW method with automatic fuction * Yes
Warning of running out of flux for SAW method* Yes
Camera system for direct view into the weld * Unlimited
Connection of  welding device through START/STOP system Yes
Feeding of the wire controlled by program * Yes
Fixed digital lever in the place of controlling  Proportional
Remote control * Yes
Power supply 3x400V 50/60 Hz
Pressure air (dry, clean) 0,5 - 0,7MPa
Design  Moveable along pulleys
Level IP IP 51 C
Output needed for installation ***
Height ***
Width ***
Depth ***
Net value ***


* Optional item, or more versions are available which differs according to function. Mentioned parameters are valid for maximal options.

** 8/5 = lower loading in one duty period /// 16/6 = industrial loading /// 24/7 = non - stop loading

*** Parameters can not be provided with 100% correctness. Configuration of the machine must be taken into consideration. Mentioned parameters are valid for reaching maximal effective value.


...Subject to change the technical parameters without notice.

The information provided here describes the Control System as a whole with all its options, which may not be available for every positioner supplied, depending on its technological capabilities, and also depends on the selected configuration of the positioner. Therefore, it is always necessary to get acquainted with the positioner first, whether its technological possibilities, even with regard to the configuration you have chosen, support all the functions listed below or not. The information is an overview of the Control System's capabilities, not the positioner's, and does not purport to explain the individual elements in detail. This is mainly due to the difficulty in understanding some of the more complex functions or equipment. For details, please contact the HST CREATIVE sales department or the technical department.



√  Simple operation adapted to the operator's understanding of the Control System.

√  Clear standby mode with display of all setpoints via a large 19" display with reliable Touch Screen technology.

√  Convenient control of key functions in the standby mode of the Control System using touch controls to quickly select and change the working environment.

√  The internal MENU and settings are divided into graphical blocks for better orientation, which can be accessed directly from the standby mode.

√  Digitally controlled adjustment of welding parameters, oscillation, positioner rotation and all other key functions.

√  Precise operator positioning with 0.2 mm resolution via proportional joystick in Y, Z and W axes.

  The possibility of selecting a suitable positioning unit and welding tower on which the welding will take place.

  Modern computerised welding process control system with touch screen for scrolling through control modes, context menu and touch gestures.

√  Digital camera capture of the welding process with a wide range of parameter settings for image optimization, including ROI function. The captured image is displayed in the standby mode of the Control System with access to all image setting options.

 Real-time measurement of the weldment temperature with display of the measured value in the standby mode of the control system.

Possibility to store your own welding programs and settings in the memory of the Control System using a programmable interface inside the system. The selected welding program is displayed in the standby mode of the Control System.


Control System Standby Mode





Technological functions of the Control System:


Welding settings:

  • Welding. Welding machine switching contact setting. In the automatic mode, the switching contact will be active, so the welding arc will be switched automatically by the machine every time after the start of the working cycle according to the set parameters of the WORKING PROGRAMME. In manual mode the welding contact is inactive, the welding arc switching must then be controlled manually by the operator on the welding control panel (Option: Automatic or Manual).

  • Direction of rotation. Setting the direction of rotation of the welded product (Option: Clockwise or Counterclockwise).

  • Diameter of the welded product. Setting the real diameter of the vessel is important so that the system correctly calculates the speed of rotation of the pulleys to achieve the desired progressive speed of rolling the vessel on the pulley units. Settings in cm range from 0.0 to 6500.0 cm. This function is only active when Automatic welding mode is selected.

  • Preheating. This function is used to melt the material well before starting the weld. Set the delay between the welding machine switching on and the start of rotation. The value is set in seconds with a precision of 0.1 sec in the range from 0.0 to 10.0 sec. The function is only active if Automatic welding mode is selected.

  • Angle of rotation. Defines the total angle by which the welded product is rotated. The limit value is 6500°. The function is only active if Automatic welding mode is selected.

  • Ending the weld. The point where the system switches off the welding contact to terminate the weld. Setting in angular degrees. The limit value is 6500°. The function is only active if Automatic welding mode is selected.

  • Welding JOB. Specific setting of welding parameters stored in the program memory of the welding power supply as a custom program that the machine calls up on the welder after starting the work cycle. Settings are possible in the range of 1 to 100. However, this functionality is only available if the communication between the machine and the welding source is controlled by a digital interface with the CanOpen protocol, otherwise basic analogue communication with START/STOP logic is available.

  • Temperature. Setting the limit value of the weldment temperature. The machine takes measurements during the welding process and when this limit temperature is reached, the system completes the current weld, but does not allow the welding process to continue with the next weld until the weld temperature has cooled below this set limit. The setting in degrees Celsius ranges from 0 to 250°C.


Pendel settings (Torch oscillation):

  • Delay. Defines the time for which the pendling function will be inactive from the moment the welder is lit. The limit value is 10.0 s.
  • Left deflection. Defines how much deflection the torch will make from the center position to the left. Setting in millimetres with an accuracy of 0.1mm. The limit value is 20.0 s.

  • Right deflection. Defines how much deflection the torch will make from the center position to the right. Setting in millimetres with an accuracy of 0.1mm. The limit value is 20.0 s.

  • Frequency. Defines the frequency at which the torch will pendulum sideways. The setting is made in Hz, i.e. the number of oscillations per second. The limit value is 4.0 Hz.

  • Left delay. Defines the amount of time the torch will remain in the left position during the pendulum. The limit value is 20.0 s.

  • Right delay. Defines the amount of time the torch will remain in the right position during pendulum operation. The limit value is 20.0 s


Surface tracking:

  • Sensor for monitoring the position of the weld track in two axes Y and Z. It is a system that automatically copies the surface of the material and automatically adjusts the position of the welding torch above the material according to the surface properties of the welded product. This function operates fully automatically, no calibration or setting of input values is required. The system always monitors the position of the welding torch above the material from the starting position, i.e. the position from which welding started.

  • If the operator manually adjusts the position of the torch above the material to be welded in the Y and Z axes during welding (using the joystick or the arrows in the Control System), the weld track sensor will consider this newly set position as its default position from which it will measure the position above the material. Unless the operator is forced to adjust the welding torch position in any way during the welding process, the sensor will always start from its initial position from which the welding was started. The sensor for monitoring the welding track is therefore fully subordinate to the manual adjustment of the Y and Z axis position, which is fully within the operator's control.





Camera settings and image optimization:

  • The digital nature of the camera brings many useful features to optimize the image in every use situation. Of particular note is the ROI function (region of interest image selection) function, which increases the clarity of the welding scene to the maximum. Another important feature is the ability to display a virtual sighting cross.

  • In addition to basic display optimization tools such as brightness and contrast, you can adjust Gamma Correction, which is a tool that adjusts the distribution of tones across the entire colour range (except black and white) to make the display more effective.
  • The camera has a digital zoom, which together with the ability to zoom the camera up to a distance of 35cm from the welding allows sufficient image magnification.






Welding torch control by joystick on the control panel:

  • The machine is equipped with a joystick, which can be used to simulate all the possibilities of setting the positions of the motion axes in real time, performed by standard arrow keys directly in the system.
  • The joystick is fully proportional, i.e. depending on the degree of its deflection to the desired side, the movement of the element occurs at a proportional speed of its deflection in both axes. If the joystick is fully deflected to one side, the element will move at the maximum speed fixed in the FIRMWARE Control System. The system automatically calculates the displacement speed based on the given deflection as multiples of the base speed, which is fixed as a displacement of 0.2mm. This speed is continuously multiplied by the system until the limit value of the displacement given by the maximum deflection of the joystick is reached.
  • The entire system reacts with a minimum response time of milliseconds, so it is a very precise system that, in conjunction with the camera system, gives the operator a feeling of maximum control over the welding process. The joystick is designed as the primary device for setting the positions of the motion axes, mainly because of its sensitivity and accuracy. Thus, during welding, the position of the welding torch should be tuned primarily by the joystick for best results. In the case of a joystick, it always depends on the environment chosen to determine which motion axes will be controlled by the joystick.