Program controlled welding machine with servo drives for welding workpieces, pipes and fittings made out of PP, PVDF and PFA, as well as other suitable materials by means of infrared radiation.
Besides the standard welding machines available on the market working either with force control or with limitation of the jointing way, this machine has servo controlled drives offering new potentialities concerning precision and number of possible processes. The combination of a high-quality drive unit and the latest drive technology sets the standard for speed, exact positions and force control. Due to this combination, welding methods are possible with either limitation of the joining way or with force control as well as with a special combination of both technics. This method is very interesting for all applications of the plastic welding technology. Particularly when welding plastic pipes with a high MFR, a stress-free cooling with a concerted residual melt can be reached at the same time.
All welding motions are driven by a servo control. Manual work steps thus are not necessary. The reachable high speeds are smoothly accelerated so that shocks and impacts in the final positions are avoided. All displacement ways can be exactly positioned. The advantage is that the radiator and planing distances are not limited by fixed end stops and can be individually adjusted as required. This means for example that the best distance can be set for each wall thickness which finally leads to a reduction of the heating time.
An access to the program is only possible by means of barcode legitimation. The card protects the welding process from unauthorized access. During the program the heating elements automatically move in and out. As a standard, the welding process conforms to the prescribed values of DVS regarding the welding area and material. Additionally it can be adjusted to individual user's requirements by means of a lab program. The welding process is only released if all requirements, desired values and work steps are met. If one programmed and desired value is out of tolerance, or if one work step is not fulfilled, the welding process is interrupted and an according error code is registered.
All welding dates, actual and desired values as well as error messages are logged in the RAM of the control and on PCMCIA card with continuous number. The welder's identification, the project and the bead number, date and time as well as all relevant actual and desired values of the parameters pressure, time and temperature, are listed. Thus all the parameters are logged which are necessary for conclusions of the quality and the performance of the weld in order to ensure an optimum of production surveillance or systems of quality assurance.