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Miller Electric OM-4409 manual Preparing Tungsten For DC Electrode Negative Dcen Welding

Models: OM-4409

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SECTION 17 − SELECTING AND PREPARING A TUNGSTEN

FOR DC OR AC WELDING

gtaw_Phase_2007−04

! Whenever possible and practical, use DC weld output instead of AC weld output.

17-1. Selecting Tungsten Electrode (Wear Clean gloves To Prevent Contamination Of Tungsten)

 

 

Amperage Range - Gas Type♦ - Polarity

 

 

 

 

Electrode Diameter

 

(DCEN) − Argon

AC − Argon

 

 

Direct Current Electrode Negative

Balance Control @ 65% Electrode Negative

 

 

(For Use With Mild Or Stainless Steel)

(For Use With Aluminum)

 

 

 

 

2% Ceria (Orange Band), 1.5% Lanthanum (Gray Band), Or 2% Thorium (Red Band) Alloy Tungstens

.040” (1 mm)

 

 

 

25-85

20-80

1/16” (1.6 mm)

 

50-160

50-150

3/32” (2.4 mm)

 

135-235

130-250

1/8” (3.2 mm)

 

250-400

225-360

 

 

 

 

 

 

Pure Tungsten (Green Band)

 

.040” (1 mm)

 

Pure Tungsten Not Recommended

 

 

10-60

1/16” (1.6 mm)

 

For DCEN − Argon

50-100

 

 

3/32” (2.4 mm)

 

 

100-160

1/8” (3.2 mm)

 

 

150-210

 

 

 

 

♦Typical argon shielding gas flow rates are 11 to 35 cfh (cubic feet per hour).

Figures listed are a guide and are a composite of recommendations from American Welding Society (AWS) and electrode manufacturers.

17-2. Preparing Tungsten Electrode For Welding With Phase Control Machines

! Grinding the tungsten electrode produces dust and flying sparks which can cause injury and start fires. Use local exhaust (forced ventilation) at the grinder or wear an approved respirator. Read MSDS for safety infor- mation. Consider using tungsten containing ceria, lanthana, or yttria instead of thoria. Grinding dust from thoriated electrodes contains low-level radioactive material. Properly dispose of grinder dust in an environ- mentally safe way. Wear proper face, hand, and body protection. Keep flammables away.

A. Preparing Tungsten For DC Electrode Negative (DCEN) Welding

Radial Grinding

 

2-1/2 Times

1

Grinding Wheel

 

Electrode Diameter

Grind end of tungsten on fine grit, hard

Causes Wandering Arc

 

3

2

abrasive wheel before welding. Do not use

 

 

 

 

wheel for other jobs or tungsten can become

 

 

1

contaminated causing lower weld quality.

 

 

2

Tungsten Electrode

 

 

 

 

 

 

A 2% ceriated tungsten is recommended.

 

 

4

3

Flat

 

 

Diameter of this flat determines amperage

Wrong Tungsten Preparation

Ideal Tungsten Preparation − Stable Arc

capacity.

 

 

 

 

4

Straight Ground

 

 

 

Grind lengthwise, not radial.

B. Preparing Tungsten For AC Welding

 

 

 

1

Tungsten Electrode

 

 

 

 

A pure tungsten is recommended..

 

 

 

1 − 1-1/2 Times

2

Balled End

 

 

 

 

 

Electrode Diameter

Ball end of tungsten by applying AC amper-

 

 

 

 

 

 

1

 

 

 

age recommended for a given electrode

2

 

 

diameter (see Section 17-1). Let ball on end

 

 

 

 

of the tungsten take its own shape.

OM-4409 Page 76

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Miller Electric OM-4409 manual Preparing Tungsten For DC Electrode Negative Dcen Welding, Preparing Tungsten For AC Welding
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OM-4409 specifications

The Miller Electric OM-4409 is a remarkable welding machine designed for both professional welders and enthusiastic hobbyists. Known for its reliability and efficiency, the OM-4409 stands out in the industrial landscape due to its advanced features and innovative technologies.

One of the main features of the OM-4409 is its impressive power output. With a rated output of 400 amps, it is capable of tackling a variety of welding applications, including MIG, TIG, and stick welding. This versatility allows users to switch between welding processes depending on the project requirements while ensuring consistent quality and performance.

The machine incorporates advanced inverter technology, which enhances its overall efficiency. Inverter technology allows for a compact design without sacrificing performance. The OM-4409 weighs significantly less than traditional transformer-based machines, making it more portable and easier to transport. Additionally, the inverter technology ensures that energy consumption is kept to a minimum, reducing operational costs.

Another notable characteristic of the Miller Electric OM-4409 is its user-friendly interface. The intuitive control panel provides easy access to settings and adjustments, allowing welders to fine-tune the machine to their specific needs. The digital display shows crucial parameters such as voltage, amperage, and wire feed speed, enabling welders to monitor their progress in real-time effectively.

Safety is paramount in industrial applications, and the OM-4409 does not disappoint. It is equipped with advanced safety features, including thermal overload protection and fault indication systems. These features ensure that the machine operates within safe limits, protecting both the user and the equipment.

The OM-4409 also boasts a robust build quality, designed to withstand the rigors of daily use in demanding environments. Its durable construction ensures longevity, minimizing maintenance and downtime.

In summary, the Miller Electric OM-4409 welding machine is a powerhouse that combines power, efficiency, and user-friendliness. With its inverter technology, versatility across various welding processes, advanced safety features, and robust design, it represents an excellent investment for any welding professional looking to enhance their capabilities. Whether for heavy-duty industrial applications or intricate metalwork, the OM-4409 delivers unmatched performance and reliability.