ESAB MT-400EHD - Operation; Operating Safety Precautions; III. Operation

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III. OPERATION
3.1 OPERATING SAFETY PRECAUTIONS
Comply with all ventilation, fire and other safety require-
ments for arc welding as established in the SAFETY
Section at the front of this manual.
Comply, also, with the following precautions:
a. Whenever welding above 250 amps, a No. 14 fil-
ter lens should be worn on your protective helmet.
Up to 250 amps, No. 11 or 12 filter lens is recom-
mended.
b. The radiant energy of the arc can decompose chlo-
rinated solvent vapors, such as trichloroethylene
1. Install the proper feed roll (see Table 1.3) to the
wire feeder. Refer to the wire feeder booklet for
installation and adjustment details.
2. Connect the proper wire outlet guide (see Table
1.3) to the wire feeder connector assembly as
shown in figure 1.3.
3. Secure the outlet guide into the front clamp of the
accessory support assembly on the wire feeder
(refer to wire feeder instruction booklet).
4. Connect the power cable, gas hose, and switch
cord to the wire feeder (see Fig. 2.1)
5. Remove retaining pin on wire feeder connector;
insert torch inlet fitting fully; and then reinsert re-
taining pin to lock fitting in place. Be sure retaining
pin is completely pushed in before feeding the wire.
6. Use the inching switch on the wire feeder to inch
the wire through the torch.
7. The torch is now ready to operate. Refer to your
wire feeder instruction booklet for operating de-
tails.
The MT-200 or MT-400 torch is supplied with liner
and contact tip for a particular wire size and No. 8,
10 or 12 standard-duty nozzle installed. If desiring
to change these components for another wire size
as given in Table 1.4.1 through 1.4.3, refer to the
Maintenance Section for instructions.
The MT-200 is rated to operate up to 300 amps
using CO
2
; 200 amps using mixed gases (60% duty
cycle).
The MT-400 is rated to operate up to 400 amps us-
ing CO
2
; 250 amps using mixed gases (60% duty
cycle).
Wire Liner
Size & Type 10' 12' 15' 25'
Hard Wires & Cored Wires
.023" (.6mm) 999743* 34929* - -
.030" (.8mm) 948850 17717 - -
.035" (.9mm) 2075237 17718 2075238 18235
.045" (1.2mm) 2075237 17718 2075238 18235
.052" (1.4mm) 2075239 17719 2075240 18236
1/16" (1.6mm) 2075239 17719 2085240 18236
5/64" (2.0mm) 2075245 17720 2075246 -
3/32" (2.4mm) 2075245+ 17720 2075246 -
Soft Wires (aluminum)
.035" (.9mm) 948862 33931 - -
3/64" (1.2mm) 948863 34932 - -
1/16" (1.6mm) 19065** - - -
TABLE 1.4.3 Recommended Liners Accessories
* Requires support liner for .023" wire. Order P/N 999797 for 10 ft. or P/N 34930 for 12 ft.
** Requires Support Liner, P/N 34930.
+ 45° curved wire guide (P/N 18243) recommended for 3/32" wire.
Figure 2.1 - MT-200 or MT-400 Torch and Wire Feed Connector Shown
Attached to MIG-35 Wire Feeder
RETAINING
PIN
WIRE FEEDER
CONNECTOR
MT-200 OR MT-400
TORCH
SWITCH
CORD
(24" lg.)
GAS HOSE
(24" lg.)
POWER CABLE (24" lg.)
(Part of Wire Feeder
Connector Assembly)