Overload Protection; Cleaning Tip And Nozzle; Changing Machine Over To Feed Other Wire Sizes; Welding With Innershield - Lincoln Electric SP-100 Service Manual

FIGURE B.7
Work Piece
6. Refer to Figure B.7. Connect work clamp to metal
to be welded. Work clamp must make good elec-
trical contact to the workpiece. The workpiece
must also be grounded as stated in "Arc Welding
Safety Precautions" in the beginning of this manu-
al.
7. Position gun over joint. End of wire may be lightly
touching the work.
8. Lower welding helmet, close gun trigger, and
begin welding Hold the gun so the contact tip to
work distance is about 3/8 inch (10 mm).
9. To stop welding, release the gun trigger and then
pull the gun away from the work after the arc goes
out
10. When no more welding is to be done, close valve
on gas cylinder (if used), momentarily operate gun
trigger to release gas pressure, and turn off the
SP-100.

CLEANING TIP AND NOZZLE

Clean the contact tip and nozzle to avoid arc bridging
between the nozzle and contact tip which can result in
a shorted nozzle, poor welds and an overheated gun.
Hint: Anti-stick spray or gel, available from a welding
supply distributor, may reduce buildup and aid in spat-
ter removal.
OPERATION
CHANGING MACHINE OVER TO FEED
OTHER WIRE SIZES
The SP-100 is shipped from the factory ready to feed
0.023-0.025" (0,6 mm) diameter wire. To operate the
SP-100 with other sizes of wire, it is necessary to
change the contact tip and change the drive roll over
Gun Cable
to other sizes. Refer to Changing the Contact Tip and
Changing the Drive Roll, in the MAINTENANCE sec-
tion, for specific information on these procedures.

WELDING WITH INNERSHIELD

Arc
Welding with Innershield requires an Innershield
Welding Kit. A gasless nozzle is provided in the
Innershield Welding Kit. When using Innershield elec-
trode, installing the gasless nozzle will improve visibili-
ty of the arc and protect the gas diffuser from weld
spatter. Additionally included is a gun cable liner to
permit proper feeding of .035" (0,9 mm) Innershield
wire. Refer to the ACCESSORIES section for details
on obtaining this kit.

OVERLOAD PROTECTION

OUTPUT OVERLOAD

The SP-100 is equipped with a circuit breaker which
protects the machine from damage if maximum output
is exceeded. The circuit breaker button will extend out
when tripped. The circuit breaker must be manually
reset.

THERMAL PROTECTION

The SP-100 has a rated output duty cycle of 20%. If
the duty cycle is exceeded, a thermal protector will
shut off the output until the machine cools to a normal
operating temperature. This is an automatic function
of the SP-100 and does not require user intervention.

WIRE FEED OVERLOAD PROTECTION

The SP-100 has an automatic electronic protection cir-
cuit to protect the wire feed motor. If excessive motor
overload occurs (due to excessive feeding force
jammed drive rolls, or shorted motor leads) the circuit
will shut down the wire feed motor and the welding
power output.
The wire feed shut-down circuit will reset automatically
when the gun trigger is released. However shut-down
will reoccur if the overload situation is not corrected.
B-6
SP-100