Lincoln Electric IM790 manual General Description, Welding Capability, Limitations

B-2 OPERATION B-2

GENERAL DESCRIPTION

The SP-175 Plus is a complete semiautomatic constant volt- age DC arc welding machine. Included is a continuous con- trolled, single phase constant voltage transformer/rectifier power source and a wire feeder with welding gun for feeding

.023” (0.6 mm) through .035” (0.9 mm) solid steel electrode. Optional kits are available for .035” (0.9 mm) and .045” (1.2

mm)Innershield® NR-211-MP cored wire and .035” alu- minum wire.

The SP-175 Plus is ideally suited for individuals having access to 230 or 208 volt 60 Hz AC input power, and wanti- ng the ease of use, quality and dependability of both gas metal arc welding or GMAW (also known as MIG welding) and the Innershield electrode process (self-shielded flux- cored or FCAW). A convenient chart is mounted inside the wire feed section door for setting welding procedures for 24 gauge (.60 mm) through 5/16” (8.0 mm) mild steel. The SP- 175 Plus is a rugged and reliable machine that has been designed for dependable service and long life.

RECOMMENDED PROCESSES

The SP-175 Plus can be used for welding mild steel using the GMAW, single pass, process which requires a supply of shielding gas or it can be used for the self shielded,

●Reversible, dual groove drive roll. Drive roll will feed

.023-.035” (0.6- 0.9 mm) diameter wire.

●Accommodates both 8” (200 mm) diameter and 4” (100 mm) diameter spools of wire.

●No external shielding gas is required when used with Lincoln .035” (0,9 mm) Innershield NR®-211-MP elec- trode.

●Easy to change polarity. (No tools required)

WELDING CAPABILITY

The SP-175 Plus, as shipped, is rated at 130 amps, 20 volts, at 30% duty cycle on a ten minute basis. It is capable of higher duty cycles at lower output currents.

LIMITATIONS

Arc Gouging cannot be performed with the SP-175 Plus. The SP-175 Plus is not recommended for pipe thawing or TIG welding.

CONTROLS AND SETTINGS

Innershield electrode process (FCAW). The SP-175 Plus is configured for use with the GMAW (MIG) process as deliv- ered from the factory.

OPERATIONAL FEATURES AND CONTROLS

The SP-175 Plus has the following controls as standard: Power ON/OFF Switch, Voltage Control, Wire Speed Control, and a Circuit Breaker.

DESIGN FEATURES AND

ADVANTAGES

●Reconnect table for 230 volt or 208 volt single phase 60 Hz input power.

●Solid state output control.

●“Cold electrode” until gun trigger is pressed for an added measure of safety.

●Overload protection — incorporates both a thermostat and a circuit breaker.

●Quality wire drive with electronic overload protection.

●Easy-to-set continuous range controls for precise setting of arc voltage and wire speed.

●“Quick Release” idle roll pressure arm is easily adjusted.

Refer to Figures B.1a

1.Power ON/OFF Switch — When the power is on the fan motor will run and air will be exhausted out the louvers in the front of the machine. The welding output and wire feeder remain off until the gun trigger is pressed.

2.Voltage Control — A contin- uous control that gives full range adjustment of power source output voltage. Voltage can be adjusted while welding.

3.Wire Speed Control — Controls the wire feed speed from 50 – 400 in /min (1.3 – 10 m/min). The control can be preset on the dial to the setting specified on the SP- 175 Plus Application Chart located on the inside of the wire feed section door. Wire speed is not affected when changes are made in the voltage control.

ON

OFF

ON

ARC VOLTS

ARC VOLTS

WIRE SPEED

SP-175 PLUS