TIG P AC/DC
ARGON ARC WELDING WITH DIRECT/ALTERNATING CURRENT
welding power source
FUNCTIONAL DESCRIPTION OF POWER SOURCES OF TIG P AC/DC
HF (soft high frequency arc ignition)
Lift Arc (contact arc ignition)
TIG AC (Авто)
TIG ACϟDC [MIX]
* ММА АС is designed to weld the metal which tends to magnetic blowout.
** ММА Pulse is designed to weld vertical and vertical fillet welds. Advantage: upward welding without any oscillating motions of electrode. Reduction of welding time approx. by 30%.
consumption of gas
System of network
REGULATION IN AC and ACϟDC MODES [MIX]
AC WAVEFORM (affects sound level and arc penetration depth)
Sinusoidal wave. Traditional and classic waveform. Soft and less noisy arc has the effect of wide and incomplete fusion of base metal.
Triangular wave. Non-traditional waveform ensures efficient peak amperage as total supplied heat is reduced. Quick wave formation reduces welding time, limits supplied heat, and decreases weld deformation degree, especially on thin materials.
Rectangular wave. Deep penetration, fast travel speed and more stable welding arc.
Automatic mode. Automatic adaptation of AC curve shape to ampherage.
The sinusoid form curve is set automatically with low currents (<180A). The rectangular shape curve is used with high currents (>180A).
SELECTION OF PULSE WELDING MODE
Traditional pulse TIG. Usually from 1 to 10 pulses per second. The effect of heating and cooling the weld area and reduction of deformation by decreasing the average amperage. The heating and cooling effect also creates unique ripples in the weld bead. The correlation between pulse frequency and travel speed is determined by the distance between the ripples of the projection. Slow pulsing may also be coordinated by adding filler and improve the general control of the weld area.
High frequency pulse TIG. If frequency increases over 40 pulses per second, pulse TIG becomes loud rather than visible and intensifies mixing in the weld area to improve the microstructure after welding. The welding current pulses generated at high speeds (between the high peak value and low background amperage) may also compress and focus the arc. It maximises stability of the arc and increases the penetration depth and welding speed. The total range is 100-500 pulses per second.
The arc tapering effect with high pulsation frequency expands to new dimensions. The pulsation at the rate of 5000 pulses per second increases arc stability and enables concentration which is especially efficient for automatic devices where the max. travel speeds are required.
Alternating current frequency regulation 30-300 Hz.
AUTOMATIC ALTERNATING CURRENT FREQUENCY REGULATION
The automatic alternating current frequency regulation for welding in AC mode. The high frequency of AC welding arc at low welding currents is applied to focus the welding arc, and reliably to capture the weld root, e.g. when making fillet welds on thin sheet metal. Due to low AC frequency the amperage applied to electrodes reduces subject to high welding currents.
TIG ACϟDC [MIX] MODE
Simple welding of aluminum alloys even in complicated situations. The function is a combination of alternating welding current (AC) and direct welding current (DC) which alternate successively.
The double arc mode reduces the redundant component of the alternating current in the electric arc to the required minimum. The reduced heat input enables welder more fully to control the weld area.
It is especially important to weld in hard to reach places, on edges of the bank or aluminum sheets or aluminum alloys which have different thickness and enables to achieve best quality welding. This mode also enables to reduce the load on the tungsten electrode.
Two-level modulation. TIG AC/DC pulsation welding implemented with low frequency (5 - 300 HZ) and high frequency modulation of welding current (15000 Hz). The first one is used to form the weld, and the second one – to stabilise and concentrate arc.
Besides, two high frequency (1000—15000 Hz) welding modes which are required for independent fusion of filler and placing melted filler into the weld may be used.
In order to fuse electrode material, especially when welding thin sheet metal, more energy and more stable arc are required, because the welder feeds the filler with its hand.
As the result, the electrode is positioned inaccurately. It is reached by high frequency modulation with high level average current of basic pulsation. It is easy accurately to place melted metal with a narrow concentrated arc which is generated by using higher frequency of pulsation welding (up to 15 000 Hz) and low level of average current of additional pulsation.
DC pulse welding frequency regulation 40-15000 Hz.
It is reached by the automatic synchronisation of the pulsation frequency with the actual welding current value. The max. frequency is used to weld with low currents, and the min. one - with high currents.
Such function significantly simplifies welder operations as it does not have to set the pulsing frequency subject to the performed job.
Higher stability stimulates the formation of pores because of high degassing of the weld area;
It simplifies welding with forced formation;
In DC phase the weld area cools down, and it is easier to control;
The materials of different thickness may be welded;
AC welding is much easier for inexperienced users.