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manual abstract
A neutral wire is not required. For TIG welding pure Argon (99.996%) should be used as shielding gas. Connect machine to gas cylinder only by means of a suitable and approved pressure reducing and regulating device.The maximum input pressure must not exceed 10 bar/142 psi. The earth cable for the work piece clamp should have a minimum cross section of 25mm2. After setting the ON/OFF switch [1] the machine is operational. 4 Operation Front view TIG 200 DCi 15 13 14 «f iilliBJ IlSiililiii i ' j Rear View TIG 200 DCi Fig. 1 4.1 Controls (1) Mains ON/OFF switch (2) Welding mode selector (3) Welding current selector (4) Slope-down time in sec. (4-step mode only) (5) Gas post flow time (6) Cable socket: TIG torch (TIG mode) Electrode holder or earth clamp earth clamp (TIG mode) electrode holder or earth clamp (8) Coupling for shielding gas line (9) Socket for TIG torch controls (10) Socket for remote control unit (11) Overload indicator (12) Hot start / base current control (13) Power cable (14) Coupling for shielding gas supply (15) Cooling fan 4.2 Manual Arc Welding With Stick Electrodes When set to ELEKTRODE (manual arc welding) controls 4 & 5 are without function. Set welding current with potentiometer [3]. The selected current can be steplessly reduced with a remote control unit (optional accessory available at extra cost) connected to socket [10]. Connect electrode holder and work piece clamp to sockets [6] and [7]. As a special feature this welding machine has a hot-start feature with stepless setting. With control [12] a percentage increase over the set base current is selected. The duration of this current boost is 0.2 - 0.4 sec. This current boost prevents the electrode form sticking to the workpiece when striking the arc. 4.3 TIG Welding The welding current lead connects to socket [6] (negative), torch control leads to socket [9]. The gas hose connects to the quick coupling [8], the work piece clamp connects to socket [7] (positive). Set welding current with welding current selector [2]. With the potentiometer build into the torch, or a foot-operated remote control unit (connected to [10], the welding current can be steplessly adjusted between the selected current and the base current set with potentiometer [12]. When setting the welding current with the welding current selector [3], the base current is automatically set (pilot arc/end crater filling). The base current can be set with potentiometer [12] to a percentage relative to the max. welding current. To prevent the H.F. ignition to interfere with electronic and computerized controls of other machines nearby, it can be disabled. The arc must then be started by touching the work piece with the tungsten electrode (scratch start). [16] Red trigger switch ON/OFF [17] Green trigger switch Fig. 2: TIG torch controls (see 4.4 and 4.5 below) 4.3.1 Starting the Arc 4.3.1.1 Arc Starting by Touching the Work Piece with the Electrode (Scratch Start) Approaching the work piece Short circuit and heating up Ignition of the arc 4.3.1.2 Touch-free High-Frequency Arc Starting Approaching the work piece Starting the pilot arc by high-frequency pulses Ignition of the arc 4.4 2-Step Mode Pressing the red trigger switch [16] starts the welding operation. After the arc has ignited (by either H.F. or touch-contact ignition), the welding current slopes up from the selected base current to the set welding current within 2 sec. When releasing the trigger switch [16] the arc extinguishes immediately. 4.5 4-Step Mode Pressing the red trigger switch [16] (Fig. 2) starts the welding operation (ignition by either H.F. or scratch start). While the trigger switch [16] (Fig. 2) is held down, the arc operates at the base current of 5 amps (pilot arc). When the trigger switch is released, the welding current slopes up to the welding current selected with the welding current selector [3] within 2 seconds. Pressing the RED trigger switch [16] (Fig. 2) again engages the slope-down function and the welding current, within the period set by the potentiometer [4], slopes down to the base current for end crater filling. Releasing the RED trigger switch ends the welding operation. Activating the green trigger switch [21] at any given time during the welding operation reduces the welding current to the base current without interrupting the welding operation. When the GREEN trigger switch is released, the current slopes up again within 2 sec to the selected welding current. 4.6 Remote Control In addition to a TIG welding torch as shown in fig. 2, a foot-operated, remote control unit can be connected to the welding machine. The remote control unit makes it possible to adjust the welding between the selected base and welding currents directly from the work place, without interrupting the welding process. This eliminates the step control with the red and green trigger switches. The welder can adapt to different welding condi...