7
I. INTRODUCTION
1.1 SCOPE
This manual provides installation, operation, service
and parts information for the MT-200, MT-400 and MT-
400EHD air-cooled welding torch with bayonet type
connector for connecting to Mig-35 and Digimig. For
information on the equipment with which the torch is
used, such as power sources and wire feeders, refer
to the instruction manuals for that equipment.
1.2 FEATURES/BENEFITS
l assembles or packages available - the MT-200,
MT-400 "ready-to-weld" torch comes ready to hook
up to the Mig 35 or Digimig Wire Feeder.
—or, the MT-400 EHD torch packages which in-
clude unassembled liner, heavy duty contact tip(s)
or tube(s), and extra-heavy duty threaded nozzle.
l lightweight extended performance - see Specifi-
cation Table 1.1.
l self-insulated slide-on nozzle design - one piece
design with insulator firmly crimped inside the
nozzle is less susceptible to burn-up.
—or, heavy-duty threaded nozzles that extend ca-
pacity.
l two-piece tip adaptor - reduces consumable costs
TABLE 1.1 Torch Specifications
(a) The MT-400 EHD torch uses HD (Heavy Duty) tips or tubes and EHD (Extra Heavy Duty) threaded nozzles to increase
current capacity to 500 amps. Using these accessories will increase the capacity of any MT-400 torch to 500 amps (see Fig.
1.4).
* @ 60% duty cycle (10 min. base)
Rated Current Capacity* Wire Sizes Available
Model CO2 Mixed Gases Accommodated Lengths
MT-200 300 amps 200 amps .023" to 1/16" 10', 12' or 15'
MT-400 400 amps 275 amps .023" to 3/32" 10', 12', 15' or 25'
MT-400 EHD 500 amps 375 amps .035" to 3/32" 15' (a)
l heavy duty torque crimped cable design - elimi-
nates premature failure of soldered cables due to
constant flexing and subsequent work hardening
and breakage of copper conductor strands.
l contact tips, or heavy-duty contact tubes - many
of which are interchangeable with the MT-200 and
MT-400 models.
l rugged, one piece composite cable assembly-
strong lightweight and easy to manipulate,
providing outstanding comfort and flexibility weld-
ers demand.
l flame retardant design - self-extinguishing ma-
terial of high impact resistance for long life and
durability.
l enclosed torch micro-switch - provides sure long
life for millions of cycles; because the micro-switch
is enclosed, no manual cleaning of exposed con-
tacts is required to keep the torch working.
l reversible torch screw - enables welder to change
the trigger location (top or bottom) to the position
of his choice.
l "easy fix" design - thread-in wire guide, slide to-
gether trigger housing, and replaceable one-piece
handle and cable assembly, allowing for quick and
easy repair.
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