Lincoln Electric IM348 AC-225-GLM - Manual (Page 17)

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USING THE CARBON ARC TORCH
. . . Welding Aluminum and Copper Alloys
. . . Brazing and Soldering
. . . Heating, Bending and Straightening
Required Equipment
1. A Lincoln Carbon Arc Torch L-2645; Its rating is 100
amperes.
2. 1/4, 5/16 or 3/8” carbons: Use only copper coated and
cored carbons to avoid overheating the holder and pro-
vide even burning of the carbons.
3. Any AC or DC welder: Carbons burn much faster on DC
than they do on AC. Also the carbon connected to the
positive DC output should be larger than the carbon con-
nected to the negative DC output so both carbons
burnoff at about the same rate.
Torch Connections
Insert the straight ferrule on the end of one arc torch lead
into the standard electrode holder. Attach the spring clip on
the end of the other lead to either the work clamp or the
welding table where the work lead is clamped. If connect-
ed to the table, insulate the work from the table. See draw-
ing below.
Use an arc welding headshield or hand shield with a No. 11
or No. 12 lens. Oxyacetylene goggles are not sufficient eye
and face protection.
When adjusting the length of carbons, be sure the welder is
turned off. An arc flash while making this adjustment can
burn hands or eyes.
When laying the torch down, avoid touching the carbons to
the grounded bench or work. This is best done by turning
the welder off. As an alternative, either set the torch on an
insulated surface or lay it on its side with the leads hanging
down over the bench so the handle rests on the bench top.
DO NOT EXCEED THE OUTPUT DUTY CYCLE OF
THE WELDER. Exceeding this duty cycle in successive
10 minute periods can overheat the welder and damage the
windings. (See page 9.)
Heat Settings
Recommended current settings for different material thick-
nesses and carbon sizes are given in the table. Generally,
use only enough current to cause the filler metal to flow
freely on the work. Do not use currents so high that the cop-
per coating burns away more than 1/2’’ above the arc.
Set the carbons to extend about 2” beyond the copper jaws.
After adjusting the welder current and setting the carbon
stickout, start the welder and you are ready to go.
Jaw Assembly
T9984
(2 Required)
Complete Arc Torch
L2645
Thumb Screw
T9078
(Part of T9984)
Ground Clip
T10379-1
Thickness of Approximate Current Carbon
Base Metal Setting (AC) Diameter
1/32" 30-50 amps 1/4"
1/16" 50-60 amps 1/4"
1/8" 70-80 amps 5/16"
1/4" 90-100 amps 3/8"
ELECTRIC SHOCK can kill.
The carbon arc torch rays will cause severe arc
burns to exposed skin. Therefore, a pair of
work gloves, long sleeved shirt or sleevelets,
and an apron are recommended.
WARNING
Be sure the welder is turned off when making this
adjustment.
WARNING