5-2. Preparing Tungsten Electrode For Welding

YGrinding 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 Or AC Welding With Inverter Machines

Radial Grinding

2-1/2 Times

Electrode Diameter

Causes Wandering Arc

3

2

 

1

 

4

Wrong Tungsten Preparation

Ideal Tungsten Preparation − Stable Arc

1 Grinding Wheel

Grind end of tungsten on fine grit, hard abrasive wheel before welding. Do not use wheel for other jobs or tungsten can become contaminated causing lower weld quality.

2Tungsten Electrode

3Flat

Diameter of this flat determines amperage capacity.

4 Straight Ground

Grind lengthwise, not radial.

B. Preparing Tungsten For Conventional AC Welding

1 − 1-1/2 T imes Electrode Diameter

12

1Tungsten Electrode

2Balled End

Ball end of tungsten by applying AC amper- age recommended for a given electrode diameter (see Section 5-1). Let ball on end of the tungsten take its own shape.

SECTION 6 − GUIDELINES FOR TIG WELDING (GTAW)

6-1. Positioning The Torch

 

 

Y Weld current can damage electronic parts in vehicles. Discon-

 

 

 

nect both battery cables before welding on a vehicle. Place work

 

 

 

clamp as close to the weld as possible.

 

3

. For additional information, see your distributor for a handbook on the

 

 

Gas Tungsten Arc Welding (GTAW) process.

 

 

 

2

 

1

Workpiece

 

 

1

90°

10−15 °

4

5

6

5 6

1/16 in

3/16 in Bottom View Of Gas Cup

Make sure workpiece is clean before welding.

42 Work Clamp

Place as close to the weld as possible.

3Torch

4Filler Rod (If Applicable)

5Gas Cup

6Tungsten Electrode

Select and prepare tungsten according to Sections 5-1and 5-2.

Guidelines:

The inside diameter of the gas cup should be at least three times the tungsten diameter to provide adequate shielding gas coverage. (For example, if tungsten is 1/16 in diameter, gas cup should be a minimum of 3/16 in diameter.

Tungsten extension is the distance the tungsten extends out gas cup of torch.

The tungsten extension should be no greater than the inside diameter of the gas cup.

Arc length is the distance from the tungsten to the workpiece.

Ref. ST-161 892

OM-1603 Page 10

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Miller Electric DB1825R Guidelines for TIG Welding Gtaw, Preparing Tungsten Electrode For Welding, Positioning The Torch
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DB1812R, DB1825R specifications

The Miller Electric DB1825R and DB1812R are robust welders designed for professionals seeking superior performance and versatility in their welding applications. Both models reflect Miller Electric's commitment to innovation, combining advanced technology with practicality for optimal results in a variety of environments.

One of the main features of the DB1825R and DB1812R is their dual voltage capability, allowing operators to easily switch between 120V and 240V input power. This flexibility is essential for users who need to work in different locations or vary their power supply. They are also equipped with the latest inverter technology, which significantly enhances efficiency and reduces energy consumption while maintaining high output quality.

For welding processes, both models support MIG, Flux-Cored, TIG, and Stick welding, making them multifunctional options for various tasks. The DB1825R features a maximum output of 250 amps, while the DB1812R offers up to 200 amps, providing ample power for thick materials. The lightweight and compact design of both units enhances portability, making it easier for welders to transport them to job sites without compromising on performance.

Another significant characteristic of the DB1825R and DB1812R is their user-friendly interface. Each unit includes an intuitive digital display, which simplifies the setup process by providing real-time feedback on parameters such as voltage, wire speed, and amperage. This technology assists users in making quick adjustments, allowing for consistent and high-quality welds every time.

Durability is a key consideration in the design of both welders. Made with high-quality materials, these models are built to withstand the rigors of industrial environments. They also incorporate advanced cooling systems to prevent overheating, thus extending the lifespan of the equipment.

Moreover, both models are compatible with Miller's lineup of welding accessories, enabling users to expand their capabilities as needed. With features like built-in safety systems, including overload protection and thermal overload protection, welders can work with confidence knowing they are using reliable equipment.

In summary, the Miller Electric DB1825R and DB1812R bring a blend of power, versatility, and ease-of-use to the welding industry. Their advanced technology, durable construction, and user-friendly features make them ideal choices for professional welders looking to enhance productivity and achieve high-quality results in a range of welding applications.
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