Miller Maxstar STH User Manual download pdf (Page 17)

SINEWAVE TRIANGULAR WAVE

ADVANCED SQUAREWAVE SOFT SQUAREWAVE

AC Waveform Selection

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

Fast transitions for

responsive and

dynamic arc.

Amps

Time (1 AC Cycle)

Square transitions

eliminate the need for

continuous HF, while

the sinewave peaks

soften the arc.

Amps

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.

Amps

All the benefits of

advanced square,

fine tuned to provide

a smooth, soft arc

with maximum

puddle control and

good wetting action.

(+)

(–)

(+)

(–)

(+)

(–)

(+)

(–)

Amps

Time (1 AC Cycle)

AC Waveshape Controls

Feature Waveform Effect on Bead Effect on Appearance

AC Balance Control

Controls arc cleaning action. Adjusting the

% EN of the AC wave controls the width of

the etching zone surrounding the weld.

Note: Set the AC Balance control for adequate arc

cleaning action at the sides and in front of the weld

puddle. AC Balance should be fine tuned according to

how heavy or thick the oxides are.

Increases balling

action of the electrode

Reduces balling

action and helps

maintain point

Cleaning

Narrow bead, with no

visible cleaning

No Visible Cleaning

Bead

Wider bead and

cleaning action

Bead

Amperage

% EN

% EP

% EN

% EP

Time (1 AC Cycle)

Amperage

30 – 50% EN

51 – 99% EN

Deep, narrow

penetration

Shallow

penetration

Cleaning

Wider bead and

cleaning action

Bead

AC Frequency Control

Controls the width of the arc cone. Increasing

the AC Frequency provides a more focused arc

with increased directional control.

Note: Decreasing the AC Frequency softens the arc

and broadens the weld puddle for a wider weld bead.

Narrower bead for

fillet welds and

automated applications

Wider bead,

good penetration —

ideal for buildup work

Cleaning

Narrower bead and

cleaning action

Bead

Amperage

% EN

% EP

% EN% EN

Amperage

120 Cycles per Second

60 Cycles per Second

Time (1 AC Cycle)

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 35 36

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Miller Maxstar STH User Manual Page 17

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