Arc welding with waveform control function

A power supply with a waveform control function, said power supply comprising:

• a waveform type selector that selects a desired shape for an output waveform of said power supply,
• a setpoint selector that sets an output setpoint for said power supply;
• a comparator circuit that receives a feedback signal corresponding to said output waveform and outputs an error signal representing a difference between said feedback signal and a reference waveform signal;
• an inverter circuit that adjusts said output waveform based on said error signal;
• and
• a waveform generator comprising,
• a digital signal processor that generates a digital reference waveform by modifying said desired waveform based on at least said output setpoint, and
• a digital-to-analog converter that converts said digital reference waveform to said reference waveform signal,
• wherein the waveform type selector provides a continuous transition between two waveform shapes by morphing through a plurality of intermediate waveform shapes via at least the digital signal processor and the digital-to-analog converter.