Control of Welding Current

B-6

OPERATION

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CAUTION

DO NOT turn the CURRENT RANGE SELECTOR while welding because the current may arc between the contacts and damage the switch.

When a forceful "digging" arc is required, usually for vertical and overhead welding, use a higher CURRENT RANGE SELECTOR setting and lower open circuit voltage. For example: to obtain 175 amps and a force- ful arc, set the CURRENT RANGE SELECTOR to 240- 160 position and the FINE CURRENT ADJUSTMENT setting to get 175 amps.

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See Figure B.2. The CURRENT RANGE SELECTOR provides five overlapping current ranges. The FINE CURRENT ADJUSTMENT adjusts the current from minimum to maximum within each range. Open circuit voltage is also controlled by the FINE CURRENT ADJUSTMENT, permitting control of the arc character- istics.

A high open circuit voltage setting provides the soft "buffering" arc with best resistance to pop-outs pre- ferred for most welding. To get this characteristic, set the CURRENT RANGE SELECTOR to the lowest set- ting that still provides the current you need and set the FINE CURRENT ADJUSTMENT near maximum. For example: to obtain 175 amps and a soft arc, set the CURRENT RANGE SELECTOR to the 190 -120 posi- tion and then adjust the FINE CURRENT ADJUST- MENT for 175 amps.

Some arc instability may be experienced with EXX10 electrodes when trying to operate with long arc tech- niques at settings at the lower end of the open circuit voltage range.

CAUTION

DO NOT attempt to set the CURRENT RANGE SELECTOR between the five points designated on the nameplate. These switches have a spring loaded cam which almost eliminates the possibility of setting this switch between the designated points.

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FIGURE B.2 – CURRENT CONTROLS

	190-120	CURRENT RANGE		FINE CURRENT
	190-120	SELECTION		ADJUSTMENT	60	50
	240-160	130-80
					70		40
	220	90			80		30
	MAX.	MIN.						FINE CURRENT
					90		20	FINE CURRENT
					100	10
CURRENT				Classic				ADJUSTMENT
RANGE	IDLER IGNITION		ENGINE		START
	IDLER IGNITION		PROTECTION
SELECTOR					CONTROL
	230 VOLT AC		115 VOLT AC		REMOTE

CLASSIC II

SVM125-A specifications

The Lincoln Electric SVM125-A is a versatile and highly efficient welding machine that has gained significant recognition in the welding industry. Designed for both professionals and enthusiasts, this machine combines advanced technology with user-friendly features to deliver outstanding performance in a range of welding applications.

One of the standout features of the SVM125-A is its Inverter Technology. This cutting-edge technology allows for lightweight and compact design, making the machine highly portable. The inverter technology also provides a steady arc, which is crucial for achieving clean, high-quality welds. With a duty cycle of 125 amps at a 60% duty cycle, this welding machine can handle a variety of materials and thicknesses, from thin sheet metal to heavier structural components.

The SVM125-A supports multiple welding processes, including MIG, stick, and TIG welding. This versatility makes it an ideal choice for diverse welding tasks, whether you're working in a fabrication shop, doing repair work, or engaged in hobbyist projects. The machine features easy switch functionality, allowing users to quickly shift between welding processes without complicated setup.

Another notable characteristic is the machine's user-friendly interface. The intuitive control panel includes clear indicators and knobs that allow for easy adjustments of voltage and wire feed speed. This design is especially helpful for novice welders, providing them with the confidence to make adjustments as needed and ensuring optimal weld quality.

Safety is also a priority with the SVM125-A. The machine is equipped with thermal overload protection, which automatically shuts it down in case of overheating, preventing damage to the unit and ensuring operator safety. Additionally, the machine features a robust construction that emphasizes durability, making it suitable for demanding work environments.

Portability is enhanced through its lightweight design, and the built-in carrying handle makes it easy to transport from one job site to another. The SVM125-A is also compatible with a variety of welding accessories, further increasing its adaptability and functionality.

In conclusion, the Lincoln Electric SVM125-A stands out as a well-rounded welding machine that integrates advanced technology with user-friendly features. Its versatility in welding processes, robust design, and emphasis on safety and usability make it a valuable tool for welders at all skill levels. Whether for professional use or personal projects, the SVM125-A is a reliable choice that delivers exceptional performance and quality.