Weldmatic 200i + Weldmatic 250i
Model No CP137, CP138
5
1 Introduction
The Weldmatic is a multiprocess welding
machine capable of Gas Metal Arc Welding
(GMAW or MIG), Manual Metal Arc Welding
(MMAW or Stick) and Gas Tungsten Arc
Welding (GTAW or TIG).
GMAW (MIG Welding)
Gas Metal Arc Welding (GMAW) is an arc
welding process where a consumable wire is
fed by motor driven feed rolls to a welding
gun, and where welding current is supplied
from the welding power source. The welding
arc is struck between the work piece and
the end of the wire, which melts into the
weld pool. The arc and the weld pool are
both shielded by gas flow from the gun, or
in the case of “self shielded” wires, by gases
generated by the wire core.
The process is very versatile in that by
selection of the correct wire composition,
diameter and shielding gas, it can be used
for applications ranging from sheet-metal to
heavy plate, and metals ranging from carbon
steel to aluminium alloys.
The Weldmatic has been designed to be
used with consumable wires of different
diameter. The smaller wire sizes are used
when welding at lower currents, such as
sheet-metal applications. Increasing the wire
diameter permits higher welding currents to
be selected.
A common application of GMAW is for
welding Mild Steel. In this application, a
Mild Steel solid consumable wire such as
AUSTMIG ES6 is used with a shielding gas
of Carbon Dioxide, or Argon mixed with
Carbon Dioxide. Alternatively, Flux-cored
consumable wires are available in both gas
shielded, and ‘gasless’ self shielding types.
Stainless steel and Aluminium can be welded
with GMAW using the correct consumable
wire and shielding gas.
The Weldmatic wirefeeder has been designed
to feed a range of hard, soft, and flux-cored
wires for the GMAW process. A compact
motor with integral gear box is coupled to
a two roll drive assembly forming the basic
component of the wirefeeder. The motor
is controlled by an electronic speed control
which provides speed regulation.
MMAW (Stick Welding)
Manual Metal Arc Welding (MMAW) is a
process where an arc is struck between a
flux-coated consumable electrode and the
work piece. The arc and the weld pool are
both shielded by gases generated by the flux
coating of the electrode.
The Weldmatic 200i and 250i has been
designed to be used with 2.0mm, 2.5mm,
3.2mm and 4.0mm diameter electrodes. The
250i can also run some 5.0mm electrodes.
The smaller electrodes are used when
welding at lower currents, such as sheet
metal applications. Increasing the electrode
diameter permits higher welding currents to
be selected.
WIA supplies a wide range of mild steel and
special purpose electrodes which cater for home
workshop, rural, and industrial requirements.
Some popular AUSTARC electrodes are listed
below. The correctly selected AUSTARC
electrode will influence the quality of the weld,
and the stability of the arc.
Austarc 12P, Classification E4313-A
A popular general purpose electrode used
with ease in all positions, vertical up or
down. The smooth forceful arc makes it
an ideal electrode for all general mild steel
applications.
Austarc 13S, Classification E4313-A
A smooth running electrode with a soft arc,
particularly suited to light sheetmetal and
smooth mitre fillet welds.
