Synergic TIG welding system

The improvement as defined in claim 3 wherein said constant positive peak current is in the range of 100-150 amperes.

In a TIG welder comprising a power source for performing an AC TIG welding process across an electrode and a workpiece, said power source having a first output lead connected to said electrode and a second output lead connected to said workpiece and a controller for creating an AC waveform across said power leads, AC waveform having a positive current section with a first duration and a peak positive current and a negative current section with a second duration and a peak negative current, the improvement comprising:

• said controller having another input device with an input receiving a signal representative of the desired set current for the welding process and an output signal determining an aspect of said waveform and representing a relationship between the frequency of said waveform for certain desired set currents.

In a TIG welder comprising a power source for performing an AC TIG welding process across an electrode and a workpiece, said power source having a first output lead connected to said electrode and a second output lead connected to said workpiece and a controller for creating an AC waveform across said power leads, AC waveform having a positive current section with a first duration and a peak positive current and a negative current section with a second duration and a peak negative current, the improvement comprising:

• said controller having an input device with an input for receiving a signal level representing a desired set current for said welding process and an output signal determining an aspect of said waveform and representing a relationship between said positive current duration and said negative current duration for certain desired set currents, which relationship is not a direct linear relationship.

In a TIG welder comprising a power source for performing an AC TIG welding process across an electrode and a workpiece, said power source having a first output lead connected to said electrode and a second output lead connected to said workpiece and a controller for creating an AC waveform across said power leads, AC waveform having a positive current section with a peak positive current and a negative current section with a peak negative current, the improvement comprising:

• said controller having a synergic input device with an input for receiving a signal level representing a desired set current for said welding process and an output signal determining an aspect of said waveform and a circuit to limit said positive peak current to a given level.

In a TIG welder comprising a power source for performing an AC TIG welding process across an electrode and a workpiece, said power source having a first output lead connected to said electrode and a second output lead connected to said workpiece and a controller for creating an AC waveform across said power leads, AC waveform having a positive current section with a peak positive current and a negative current section with a peak negative current, the improvement comprising:

• said controller having a synergic input device with an input for receiving a signal level representing a desired set current for said welding process and an output signal determining an aspect of said waveform and a circuit to limit the energy of said positive section to a given level.