Synergic Setting of TIG Systems - Ewm-sales.co.uk

Synergic settingFigure 2 shows the new power source that is availablein different output sizes and designs, e.g. for directcurrent as well as for both direct current andalternating current. The power source is constructedon an inverter basis, has a vertically fallingcharacteristic in the working range (constant currentcharacteristic) and is fully digitised. This means that itcan be used for both TIG and plasma welding.The section above has shown that for the optimumshould be pressed. The welding data then activatedapply for all joint types in out-of-position welding. If thewelder then presses the top symbol in the far righthandcolumn, the right-hand display panel shows theplate thickness in mm and during the welding processthe left-hand panel will show the relevant currentintensity. The rotary dial is then used to set the platethickness and the system is now programmed with theoptimum settings for the welding task set.The column at the top left (Figure 4) shows the welderwhich tungsten electrode diameter he has entered.This means that the correct plate thickness/currentintensity ratio and the most favourable ignitionparameters for this diameter will have been setautomatically. If current pulses are used for welding,the corresponding key (Figure 4) should be pressed.Figure 4Upper part of the operator panel (regular hidden)Figure 2settings, considerable expert knowledge is requiredfrom the welder. With synergic operation of thewelding system on the other hand, the operator hasaccess to the expertise of the machine manufacturerstored in the software, which simplifies the task.Figure 3TIG welding system with synergic settingLower part of the operator panel (always visible)In the always visible lower part of the panel (Figure 3)the operator can enter the material being welded onthe first column from the left and the joint type beingwelded on the second line. If one of the threealuminium materials is entered, the systemautomatically sets itself up for alternating current. It isthen assumed that the welding work will be carried outin the positions flat or horizontal vertical. If out-ofpositionwelding is being used, the bottom symbol inthat row with the character for the vertical up positionThis calls up the most suitable pulse parameters.The system is now working on the basis of thecharacteristics for one of the 128 permanentlyprogrammed jobs. If only the plate thickness ischanged, this job is retained, and the working pointsimply moves up or down on the “Platethickness/current intensity” characteristic. A further 16sequence programs are stored for each job. Thesecan be called up using the “PROG” key on the righthandpart of the operator panel (Figure 3). Thenumber is displayed on the right-hand display panel;the sequence is shown in the diagram (Figure 4) andthe corresponding values on the left-hand displaypanel.Currently all the settings apply assuming that pureargon is being used as the shielding gas.In addition to the 128 permanent jobs, another 128free jobs can be stored individually. Welding data forargon/helium mixtures can be entered, e.g. as freejobs. As an explanation of terms, here is a shortdescription once more of the term Job:Job: contains all parameters relating to the weldingtask, including the parameters that improve thesequence of the welding process, such as ignition andend programs.© 2003 EWM HIGHTEC WELDING GmbH 2/3 WM025101.doc; 12.03