Impax IM-MMA140, Instruction Manual, Page: 14 / 24

13
OPERATION
Description
Your Welding Power Supply features a single
phase transformer suitable for welding with an
alternating current using stick electrodes with
diameters from 1.6mm to 4.0mm. The welding
current is regulated by using the welding current
control (regulator).
Electrode Selection.
The pages of this manual are restricted to the
basic safe use of an MMA welding power supply
and very basic welding technique. The
electrodes used in MMA welding are many and
varied. You are advised to seek advise from your
local welding equipment supplier for the correct
selection of electrode for the work being
performed.
Operation
Warning!
If you have no welding experience, we
recommend you seek training from an
experienced person.
Caution: This manual is a basic guide to
welding. We recommend you purchase a good
quality publication on welding or if you have
internet access visit one of the numerous
welding related web sites to be able to use the
welding power supply to its full potential.
THE QUALITY OF ANY WELDED JOINT IS
DEPENDANT ON THE PREPARATION OF THE
JOINT THE SELECTION OF THE CORRECT
ELECTRODE AND THE SKILL AND
EXPERIENCE OF THE WELDER.
Ensure the Welding Power Supply is
disconnected from the mains supply.
Ensure that the area of the work piece where the
earth clamp is to be connected is clean using a
file or a grinder, to ensure a good electrical
contact.
Ensure the earth lead is connected to the
workpiece, and the other lead to the electrode
holder.
Important: Ensure also that the earth clamp is
attached to clean, solid metal. If necessary
thoroughly clean with a wire brush or similar to
guarantee a good connection.
The earth clamp must only be connected to the
work piece. The area to be welded must be
clean and free from dirt, rust, paint, grease and
oil.
Insert an electrode into the electrode holder
(Fig.5) ensuring there is a good connection.
Set the amperage (see Table 1) by adjusting the
regulator (Fig.6)(A) until the desired setting is
reached.
The chart below is an indicator of the electrode
diameter and the corresponding welding
current. This is intended as a guide only.
Fig 5
Fig 6
Table 1
Electrode diameter (mm) Amperage (A)
1.5 mm 40-55
2.0 mm 50-70
2.5 mm 75-95
3.25mm 100-140
A
B