Lincoln Electric IM784 PRO 100 - Manual (Page 18)

B-5 OPERATION B-5
Making A Weld
1. See “ Process Guidelines ” in this section for selec-
tion of welding wire and shielding gas and for
range of metal thicknesses that can be welded.
2. See the Application chart on the inside of the wire
feed compartment door for information on setting
the PRO 100 controls. Refer to Table B.1 for alu-
minum and stainless wire.
3. Set the Voltage ( “ V ” ) and Wire Speed ( “ olo ’” ) con-
trols to the settings suggested for the welding wire
and base metal thickness being used, refer to
Applications chart on the inside of the wire drive
compartment door.
4. Check that the polarity is correct for the welding
wire being used and that the gas supply, if
required, is turned on.
5. When using Innershield electrode, remove the gas
nozzle and install the gasless nozzle. This will
improve visibility of the arc and protect the gas dif-
fuser from weld spatter. Refer to the MAINTE-
NANCE section for details on nozzle replacement.
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
PRO 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.
PROCESS GUIDELINES
The PRO 100 as shipped, can be used for welding
mild steel using the self shielded, Innershield elec-
trode process or it can be used for the GMAW (MIG),
single pass, process which requires a supply of
shielding gas and the K610-1 MIG Conversion Kit.
The recommended electrode for the self-shielded
process is 0.035
” (0,9 mm) diameter Lincoln Inner-
shield NR-211-MP. Requires optional spindle – refer
to Accessories section. This electrode can be used for
all position welding of 20 gauge through 5/16
” (1,0 –
8,0 mm) thick steel [multiple passes are required for
1/4
” and 5/16 ” (6,0 and 8,0 mm)].
The recommended gas and electrode for GMAW is
welding grade CO2 gas and 0.025
” (0 6 mm) diameter
Lincoln Super Arc L-56 mild-steel welding wire [sup-
plied on 12-1/2 Ib (6 kg) spools]. For 14 gauge (2,0
mm) and thinner, CO2 gas is recommended because
it gives equal or better performance than a blended
gas at a lower cost. A mixed gas consisting of 75 to
80% Argon and 20 to 25% CO2 is recommended for
welding on heavier gauge steel, 12 gauge (2,5 mm)
for example.
PRO 100
FIGURE B.6
FIGURE B.7
PRO 100
WORKPIECE
GUN CABLE
ARC
WORK CLAMP
Contact Tip
Electrode
3/8 ” -1/2 ” (10-12mm)Contact
Tip to Work Distance(CTWD)