Learning to Weld, ARC-WELDING Circuit | Lincoln Electric PRO 100

B-7	LEARNING TO WELD	B-7

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 inexperienced operator to understand welding and develop this skill. For more detailed infor- mation, order a copy of “New Lessons in Arc Welding” listed at the end of this manual.

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.7 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 33 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.8. Always disconnect electrical devices before welding upon them.

Electronic Components

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 WELDING ARC

Figure B.9 illustrates the action taking place in the self shielded FCAW (Innershield) welding arc. It closely resembles what is actually seen while welding.

HingesBearings

FIGURE B.8

Burning of core materials

Cored Wireinside wire electrode results in shield of gas.

Protective Slag

Arc Stream

Weld Metal

FIGURE B.9

PRO 100

PRO 100 specifications

The Lincoln Electric PRO 100 is a compact and versatile multi-process welder designed to meet the needs of both novice and experienced welders. Known for its robust build quality and advanced features, the PRO 100 is engineered for tasks ranging from light fabrication to heavy-duty welding projects.

One of the standout features of the PRO 100 is its multi-process capability. It can seamlessly switch between MIG, Stick, and TIG welding, allowing users to tackle various materials including aluminum, stainless steel, and mild steel with ease. This versatility makes it an essential tool for welding professionals and hobbyists alike, enhancing productivity and efficiency on the job.

The machine is equipped with Lincoln Electric's unique Auto-Set technology, which simplifies the setup process for users. By automatically adjusting the voltage and wire feed speed based on the selected material and thickness, it enables welders to achieve optimal results without extensive experience or technical knowledge. This feature not only saves time but also reduces the likelihood of mistakes, making it ideal for beginners.

Powering the PRO 100 is a reliable inverter-based technology that ensures smooth and consistent arcs. This technology not only enhances performance but also improves energy efficiency, making the machine more cost-effective in the long run. The compact design allows for portability, making it convenient for job sites where space may be limited.

The PRO 100 also boasts several safety features that protect both the user and the machine. It includes an overload protection system that prevents overheating, ensuring the longevity of the welder. Additionally, the welder features a rugged construction that can withstand demanding work environments, further enhancing its durability.

Furthermore, the PRO 100 is designed for user comfort and control. The intuitive interface and large color display provide clear readability of settings and parameters, allowing for quick adjustments. The adjustable wire feed speed and voltage settings give welders the flexibility to customize their welding experience.

In summary, the Lincoln Electric PRO 100 stands out in the crowd of welding machines for its multi-process capabilities, Auto-Set technology, and inverter-based power system. Its combination of portability, durability, and user-friendly features makes it an excellent choice for a wide range of welding applications, whether at home, in the workshop, or on the field. This well-rounded welder can help elevate the quality of the work for both the novice and the seasoned professional.