Miller Electric 700 Pulse TIG Controls, AC Waveform Selection, High Speed DC TIG-Pulse Controls

AC Waveshape Controls (Continued)

AC Waveform Selection

Select from four different AC waveforms to optimize the arc characteristic for your application. Choose from:

ADVANCED SQUAREWAVE

SOFT SQUAREWAVE

	(+)
Amps		Fast transitions for
	0	responsive and
	(–)	dynamic arc.
		Time (1 AC Cycle)

	(+)
Amps	0
	(–)

Time (1 AC Cycle)

All the benefits of advanced square, fine tuned to provide a smooth, soft arc with maximum puddle control and good wetting action.

SINEWAVE

TRIANGULAR WAVE

	(+)
Amps	0
	(–)

Time (1 AC Cycle)

Square transitions eliminate the need for continuous HF, while the sinewave peaks soften the arc.

	(+)
Amps	0
	(–)

Time (1 AC Cycle)

Unconventional wave provides the punch of the peak amperage, while reducing overall heat input. Quick puddle formation reduces weld time — limiting heat input and reducing weld distortion, especially on thin materials.

Pulse TIG Controls

High Speed DC TIG-Pulse Controls

•PPS Pulses per second (Hz): DC = 0.1 – 5,000 PPS / AC = 0.1 – 500 PPS

•% ON – % Peak Time: 5 - 95% (Controls the amount of time during each pulse cycle at the PEAK amperage.)

•Background Amps: 5 – 99% (Sets the low-pulse amperage value as a % of the Peak Amps.)

CONVENTIONAL PULSED TIG

Peak	Peak Time %
Amps

Background

Amps

(% of Peak)

Pulse Cycle

Typically from 1 to 10 PPS. Provides a heating and cooling effect on the weld puddle and can reduce distortion by lowering the average amperage. This heating and cooling effect also produces a distinct ripple pattern in the weld bead. The relationship between pulse frequency and travel speed determines the distance between the ripples. Slow pulsing can also be coordinated with filler metal addition and can increase overall control of the weld puddle.

HIGH SPEED PULSED TIG

Peak	Peak Time %
Amps

Background

Amps

(% of Peak)

Pulse Cycle

In excess of 40 PPS, Pulsed TIG becomes more audible than visible — causing increased puddle agitation for a better as-welded microstructure.

Pulsing the weld current at high speeds — between a high Peak and a low Background amperage — can also constrict and focus the arc. This results in maximum arc stability, increased penetration and increased travel speeds (Common Range: 100 – 500 PPS).

The Arc-Sharpening effects of high speed pulsing are expanded to new dimensions. The ability to pulse at 5,000 PPS further enhances arc stability and concentration potential — which is extremely beneficial to automation where maximum travel speeds are required.

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