SECTION 8 – CERTIFICATION FOR HIGH FREQUENCY ARC WELDING EQUIPMENT

8-1. GENERAL

The following information is necessary to make a proper installation of the high-frequency arc welding equipment described in this instruction manual. In order to comply with Part 18 of the Rules and Regulations of the Federal Communications Commission (FCC), the certificate in the front of this manual must be filled in completely and signed after the unit has been correctly installed. The certificate must be kept WITH THE EQUIPMENT AT ALL TIMES to comply with the regulation. The manu- facturer of the equipment covered herein has conducted approved field tests and certifies that the radiation can be expected to be within the legal limits if the correct in- stallation procedures, as outlined, are followed. The im- portance of a correct installation cannot be overempha- sized since case histories of interference due to high- frequency stabilized arc welding equipment have shown that in most cases, an inadequate installation was at fault. In the event that interference with authorized FCC services occurs, the user is required to take suitable steps to clear the situation. The Factory Service Depart- ment personnel will assist the user by supplying techni- cal information.

Instead of complying with the installation requirements and the certification of each individual installation, the user may elect to certify the entire plant by having a qualified engineer make a plant radiation survey. In such cases, these instructions could serve as a guide in mini- mizing interference that might be caused by the high- frequency arc welding equipment.

Many processes and applications of processes require open-circuit voltages sufficient to jump from the elec- trode to the work without making direct contact. The maximum open-circuit voltage (OCV) of a welding power source is not sufficient for this. In the Submerged Arc Welding (SAW) process, granules of flux often get between the electrode and the workpiece making start- ing of the arc difficult at normal open-circuit voltages. A higher voltage is also required to start and maintain a stable arc in processes like the Gas Tungsten Arc Weld- ing (GTAW) process. In these cases it will take several thousand volts to cause an electrical spark to jump this gap between the electrode and the work, creating an in- itial path of ionization that the arc current can follow without the hazards that would be present at power fre- quency.

In order to provide these higher voltages, it is common practice to superimpose a high open-circuit voltage on the output of a welding power source by using high-fre- quency techniques. The high-frequency voltage can be a source of interference and will be discussed in this section.

8-2. DEFINITIONS

A.High-Frequency Assisted Arc Welding Power Sources

In the arc welding process, high frequency may be used for initiating an arc or stabilizing the arc once it is struck, or for both functions.

The energy from the high-frequency source must flow to the welding electrode via a good quality, low impedance, and well insulated connecting cable.

B. Welding Circuit

The welding circuit consists of all attachments con- nected to the welding terminals.

C. Welding Terminals

Welding terminals are the terminals which provide weld- ing power and high-frequency energy to the arc.

D. Electrode Terminal

The electrode terminal is the terminal to which the elec- trode cable or welding torch is connected.

E. Welding Torch

A device used in the Gas Tungsten Arc Welding (GTAW) process to control the position of the electrode, to trans- fer current to the arc, and to direct the flow of shielding gas.

F.Work Terminal

The work terminal is the terminal to which the welding workpiece is connected.

G. Welding Zone

The welding zone is the space within 50 ft. (15 m) in all directions from the midpoint between the power source and the welding arc (see Figure 8-6).

H. Bonding

Bonding refers to connecting metallic objects together to cause the objects to be at the same potential regard- less of any current flow between them (see Figure 8-3 and Figure 8-4).

I.Grounding (Earthing)

Depending on the practices within jurisdictions, one of these terms is commonly used to indicate the connec- tion, or bonding, of parts of the apparatus to the earth.The terms may be used interchangeably.

J. Receiver

A receiver is any device normally used for receiving electromagnetic energy and converting it to useful com- munications purposes.

K. Conduction

Conduction is the transmission of high-frequency en- ergy via an electrical conductor or conducting medium.

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Miller Electric KC237900 manual Certification for High Frequency ARC Welding Equipment, General, Definitions
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KC237900 specifications

The Miller Electric KC237900 is a standout model in the realm of welding technology, specifically designed for versatility and efficiency. This machine embodies Miller's commitment to innovation and quality, making it a popular choice among professionals and hobbyists alike.

One of the main features of the KC237900 is its advanced inverter technology, which allows the unit to operate efficiently across a range of welding applications. This technology ensures that the welder maintains a stable arc for precision welding, even on thin materials. The inverter design also contributes to a lighter and more compact machine, enhancing portability without compromising on power.

The KC237900 supports multiple welding processes, including MIG, Flux-Cored, and Stick welding. This versatility makes it suitable for a variety of projects, from automotive repairs to intricate fabrication tasks. The machine’s ability to handle diverse materials, including steel, stainless steel, and aluminum, further expands its application scope.

Another characteristic of the Miller Electric KC237900 is its user-friendly interface. The digital display provides clear information on amperage and voltage settings, allowing welders to make quick adjustments as needed. Additionally, the intuitive control panel simplifies the operation, making it accessible to users with varying skill levels.

The arc technology integrated into the KC237900 contributes to its smooth and stable welding performance. The unit utilizes Miller's Auto-Set feature, which automatically adjusts parameters based on material thickness and type. This feature not only speeds up the setup process but also enhances the overall weld quality.

Durability is another key aspect of the KC237900. Built with robust materials, the machine is designed to withstand the rigors of job site conditions. Its protective features, such as thermal overload protection, ensure that the unit operates safely and efficiently.

In conclusion, the Miller Electric KC237900 is a high-performance welding machine that combines advanced inverter technology, versatility, and user-friendly features. With its ability to handle multiple welding processes and materials, along with its focus on reliability and ease of use, it stands out as an excellent choice for both experienced welders and newcomers to the trade. Whether for professional use or personal projects, the KC237900 delivers the performance and quality that Miller Electric is known for.
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