Learning to Weld, ARC-WELDING Circuit | Lincoln Electric IM822

B-6	OPERATION	B-6

LEARNING TO WELD

No one can learn to weld simply by reading about it. Skill comes only with practice. The following pages will help the operator to understand welding and develop this skill.

THE ARC-WELDING CIRCUIT

The operator’s knowledge of arc welding must go beyond the arc itself. The operator must know how to control the arc, and this requires a knowledge of the welding circuit and the equipment that provides the electric current used in the arc. Figure B.5 illustrates the welding circuit for a typical welding machine. The circuit begins where the gun cable is attached to the welding machine. Current flows through the gun cable, gun, and contact tip, to the wire and across the arc. On the work side of the arc, current flows through the base metal to the work cable and back to the welding machine. This circuit must be complete for the current to flow.

This machine’s welding circuit has a voltage output of 29 volts DC maximum. This voltage is quite low and is only present when the gun trigger is depressed.

To weld, the work clamp must be tightly connected to clean base metal. Remove paint, rust, dirt or oil as necessary and connect the work clamp as close as possible to the area you wish to weld. This helps pre- vent current from going through an unwanted path. Avoid allowing the welding circuit to pass through hinges, bearings, electronic components, or similar devices that can be damaged. See Figure B.6. Always disconnect electrical devices before welding upon them.

FIGURE B.6

Bearings

Hinges

Electrical Components

WRONG

CURRENT

PATH

CORRECT CURRENT *

PATH

*For best results position work clamp approximantely 12 inches(294mm) from the welded area.

WARNING

Fumes and slag generated from Innershield type electrodes recom- mended for use with this welding machine can be toxic.

•Avoid contact with eyes and skin.

•Do not take internally.

•Keep out of reach of children.

•Follow all safety precautions found in this operating manual.

The gun and cable assembly is held by the operator who guides the automatically fed wire along the joint, maintaining a contact tip to work distance of about 3/8 to 1/2 inch (10 – 12 mm) This is called electrical stick- out. This electrical stickout (ESO) must be properly maintained by the operator. The electric arc is made in the gap between the work and the tip end of a small diameter wire. When the power source is properly set, the arc gap is maintained automatically.

Arc welding is a manual skill requiring a steady hand, good physical condition, and good eyesight. The oper- ator controls the welding arc, and, therefore, the quali- ty of the weld made.

THE SELF-SHIELDED FCAW (FLUX CORE) WELDING ARC

Figure B.7 illustrates the action taking place in the self shielded FCAW (Innershield) welding arc. It closely resembles what is actually seen while welding.

Burning of core materials

Cored Wireinside wire electrode results in shield of gas.

Protective Slag

Arc Stream

Weld Metal

FIGURE B.7

MIG PAK HD

IM822 specifications

The Lincoln Electric IM822 is a cutting-edge multi-process welding machine that is making waves in the welding industry for its advanced capabilities and user-friendly features. Known for its versatility, the IM822 supports a variety of welding processes including MIG, TIG, and stick, accommodating a wide range of applications in both industrial and commercial settings.

One of the standout features of the IM822 is its inverter technology, which enhances both performance and efficiency. This inverter-based system allows the welder to output a stable arc, even in fluctuating input power conditions, making it ideal for use on job sites with inconsistent power supplies. The lightweight and compact design of the IM822 are direct benefits of this inverter technology, allowing for portability without sacrificing power.

The IM822 also boasts an impressive duty cycle, which allows for prolonged use without overheating. This characteristic is crucial for professional welders who require consistent, high-quality welds over extended periods. Additionally, it is equipped with an easy-to-read digital display that presents key information such as voltage and amperage settings, giving operators precise control over their work.

User-friendly interface is another hallmark of the Lincoln Electric IM822. The machine comes with intuitive controls that make it easier for both novice and experienced welders to navigate through settings quickly. With preset programs, users can select the most suitable parameters for specific materials and thicknesses, thereby enhancing productivity and reducing setup time.

Moreover, the IM822 excels in providing versatile welding capabilities, allowing it to handle various materials, including stainless steel, aluminum, and mild steel. The machine's robust construction further ensures durability, making it a reliable tool that withstands the rigors of demanding work environments.

Incorporating safety features such as thermal overload protection and an automatic shut-off system, the IM822 promotes safe operation, minimizing the risk of accidents. With a history of quality and innovation backing it, Lincoln Electric has positioned the IM822 as a go-to choice for welders seeking a modern solution that doesn't compromise on power or usability.

In conclusion, the Lincoln Electric IM822 combines advanced inverter technology, user-friendly operation, and robust welding capabilities, making it an excellent investment for professionals in the welding field. Whether for fabrication, repair, or maintenance applications, the IM822 stands out as a versatile and dependable welding solution.

Lincoln Electric IM822 manual Learning to Weld, ARC-WELDING Circuit

Models: IM822

OPERATION