Miller Multimatic 220 AC/DC Quick Reference

Multimatic® 220 AC/DC Quick Reference (TIG and Stick)

Read and follow all labels and the Owner’s Manual carefully before installing, operating, or servicing unit.
Read the safety information at the beginning of the manual and in each section.

Note: Thes e settin gs are inten ded to be a st artin g point for c ontrol pa nel setup — t his is not a weldi ng proce dure spe cicati on nor a subs titute for p roced ure quali cation.

Select Process

Use up/down buttons to select.

Select TIG Arc Start

(TIG only)

Use up/down buttons to select.

Turn Auto-Set ON

Button will illuminate.

Select Tungsten or Rod Diameter

Use –/+ buttons to select.

Select Material Thickness

Use –/+ buttons to select.

Adjust Amperage

Use right knob to ne-tune.

TIG Manual Mode (Aluminum) TIG Manual Mode (Steel/Stainless) Stick Manual Mode

Amperage Adjustment

Controls the welding amperage output. Limits the maximum
output of a remote amperage device.

TIG Arc Start Select

Determines the method used to initiate the arc. Choose the
appropriate start by using the TIG Arc Star t up/down buttons.
Lift- Arc (no remote) is only available in TIG Steel/Stainless
process. Quick termination of the arc is not advisable in the
TIG Aluminum process.

Tungsten Size

Each tungsten diameter requires specic preset parameters for
optimized starting. Choose the correct tungsten electrode size
you are welding with using the left-side –/+ buttons. Select
from 1/16" or 3/32" diameters. (See tips on back.)

AC Frequency Adjustment*

Controls the width of the arc cone. Increasing the AC Frequency
provides a more focused arc and increased directional control.
Range is 60 –150 Hz. Pro- Set value is 120 Hz. (See tips on back.)

AC Balance Adjustment (%EN)*

Controls oxide cleaning. Increasing set ting reduces oxide cleaning.
Range is 60 – 80%. Pro- Set value is 75%. (See tips on back.)

DC Pulse Adjustment*

Reduces heat input to minimize distortion and increase travel
speed. Set PPS (pulses per second). The range is OFF –150 PPS.
Pro-Set value is 100 PPS. The background amperage and peak
amperage are not adjustable. Background amperage = 25% of
peak amperage. Peak amper age time = 40%. (See tips on back.)

DIG Adjustment (Arc Force Control)*

Controls the amount of additional amperage at low voltage
(short arc length) conditions. Adjust the force of the arc for
different joint congurations and electrodes. Range is OFF –99%.
Pro-Set value is 30% for 7018 electrodes.

TIG Post Flow Control (shown on back page)

Controls the length of time gas ows af ter welding stops.
Range is AUTO –25 seconds. AUTO calculates the time based on
the maximum amperage of each welding cycle. The minimum
time is 8 seconds. AUTO = maximum amperage/10.

*

Indicates Pro -Set™ selectable parameter available. Provides
professional settings developed f or the weld proc ess. To use Pro -Set,

adjust the but ton or knob until Pro -Set  ashes on the dis play and the
number is blue indicating the professional set ting for the par ameter.

TIG/Stick Auto-Set™ Elite

(TIG Steel/Stainless screen shown)

1

2

3

4

5

6

Select Process

Use up/down buttons to select.

Select TIG Arc Start

Use up/down buttons to select.

Note: Lift- Arc not available in TIG Aluminum

Turn Auto-Set OFF

Button will not be illuminated.

Select Tungsten Diameter

Use –/+ buttons to select.

Adjust AC Balance (%EN)

Use –/+ buttons to adjust.

Adjust AC Frequency

Use left knob to adjust.

Adjust Amperage

Use right knob to adjust.

Select Process

Use up/down buttons to select.

Select TIG Arc Start

Use up/down buttons to select.

Turn Auto-Set OFF

Button will not be illuminated.

Select Tungsten Diameter

Use –/+ buttons to select.

Adjust DC Pulse

Use left knob to adjust.

Adjust Amperage

Use right knob to adjust.

Select Process

Use up/down buttons to select.

Turn Auto-Set OFF

Button will not be illuminated.

Adjust DIG (Arc Force)

Use left knob to adjust.

Adjust Amperage

Use right knob to adjust.

6 7

3

4

5

1 1 1 12

6

2

3

4

5

3 2

4

2

AMPS

3/32"

TUNGSTEN MATERIAL

1/8"

120

FREQ AMPS

120 210

3/32"

75

TUNGSTEN BALANCE%EN

PULSES PER SECOND

PULSER

OFF

AMPS

210

3/32"

TUNGSTEN

USE REMOTE

DIG AMPS

30 120

1

2

3

4

5

6

7

1

2

3

4

5

6

5 6

1

2

3

4

3 4

A Multimatic 220 AC-DC QRG 283817 Front.pdf 1 9/24/18 1:51 PM

#283817 © 2018 Miller Electric Mfg. LLC

AC Waveshape Controls

Setting Arc Effect Weld EffectFeature

AC Balance

AC Balance controls arc cleaning
action. If oating black spots
appear in the puddle, the
balance setting is too high.
Turn the balance down until
puddle becomes clear.

60%

75%

Increases electrode
balling action

Reduces balling,
helps maintain
point of electrode

Wider bead and
cleaning action

Cleaning

Bead

Cleaning

Narrow bead with
reduced cleaning

Bead

Tungsten Selection and Prep

Tungsten Type Application Notes

Diameter Amp Range

Good all-around tungsten for
both AC and DC welding.

Excellent low-amp starts for
AC and DC welding.

Commonly used for DC welding,
not ideal for AC.

PURE TUNGSTEN (green) is NOT recommended for inverters!

For best results in most applications use a sharpened cerium
or lanthanum electrode for AC and DC welding.

Note: Only 1/16" or 3/32"
tungsten can be selected
when using Auto-Set.

2% Thorium

2% Cerium

1.5/2% Lanthanum

0.020"

0.040"

1/16"
3/32"

1/8"
5/32"
3/16"

1/4"

5– 20

10– 80
10– 150
60– 250

100– 400
160– 500
190– 750

325– 1100

Tungsten Preparation: Sharpen tungsten for AC and DC welding.

Tip: Blunting the tip of the electrode is sometimes done to help maintain consistent geometry and resist
tungsten erosion. This is especially helpful in AC when melt-back of the tungsten electrode is common.

Note: Do not use wheel for other jobs or tungsten can become contaminated.

Ideal Preparation — Stable Arc

CORRECT INCORRECT IDEAL GRIND ANGLE RANGE

AC EFFECT

Wrong Preparation — Wandering Arc

Grinding
Wheel

Stable Arc

Blunt Tip

Straight Ground

Radial Ground

15˚ to 30˚

Slight meltback
of electrode tip

Pointed Tip

Arc Wander

Grinding
Wheel

MillerWelds.com

60 Hz

120 Hz

Bead

Narrower prole
for llet welds

Wider prole ideal
for buildup work

Bead

AC Frequency

Controls the width of the arc
cone. Increasing the AC
Frequency provides a more
focused arc and increased
directional control.

Note: Decreasing the AC
Frequency softens the arc and
broadens the weld puddle for a
wider weld.

Visible oxide
removal (etching)

Visible oxide
removal (etching)

TIG Postow Control (Menu 12 of 12)

Pulsed TIG Controls

Low-Speed Pulse High-Speed Pulse

The Pulsed TIG function switches the amperage from a high (peak) to a low (background) at a set rate (PPS).
Pulsing can reduce heat input by lowering the average amperage, increasing control of the weld puddle,
penetration and distortion. The following parameters can be adjusted for desired results:

Tip: Begin welding at factory default settings of 100 PPS, 40% peak and 25% background amps.
Adjust the frequency (PPS) to change width and appearance.

1 to 10 pulses per second (PPS) will produce a
distinct ripple pattern in the weld bead. Can be
used to time ller addition, reduce distortion and
improve control.

100 pulses per second (PPS) and higher helps to
focus the arc for increased stability, penetration and
travel speed. Increased puddle agitation improves
weld microstructure.

Distinct ripple pattern

Narrow bead and

heat affected

zone

Focused arc
increases
travel speed
and penetration

Access (and Exit) Setup Menus

Simultaneously press and release
left-side – button and right-side + button.

Navigate to

TIG Postow Control Menu

Use right-side –/+ buttons to select menu 12.

Adjust TIG Postow

Use right knob to adjust. The range is
AUTO–25 seconds. After completing
selection, exit setup menus (see step 1).

1

2

3

2

1 1

3

AUTO

12 / 12

TURN RIGHT ENCODER

TO ADJUST SETTING

TIG POSTFLOW

CONTROL

A Multimatic 220 AC-DC QRG 283817 Back.pdf 1 9/24/18 1:52 PM