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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,
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
● Reconnectable 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.
OPERATION
● 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 Innershield .035" (0,9 mm) NR®-211-MP elec-
trode.
● Easy to change polarity. (No tools required)
● Accepts optional Spot/Stitch Timer Kit.
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
Refer to Figures B.1a & B.1b.
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
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.
SP-175 PLUS
ARC VOLTS
output
voltage.
ARC VOLTS
WIRE SPEED
B-2
ON
OFF
ON
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