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WT141ARC
Welding Machine
www.weldtech.net.nz
• Replace worn consumable parts in a timely
manner.
• Use a soft cloth or brush to clean electrical
components.
• Do not use liquid cleaning products, water or
especially solvents.
• Do not use compressed air to clean electrical
components as this can force dirt and dust
further into components, causing electrical short
circuits.
• Check for damaged parts. Do not use the welder
with damaged parts.
If damaged, before further use, the welder must be
carefully checked by a qualified person to determine
that it will operate properly. Check for breakage of
parts, mountings and other conditions that may
affect its operation.
Have your welder repaired by an expert. An
authorised service centre should properly repair a
damaged part.
This appliance is manufactured in accordance with
relevant safety standards. Only experts must carry
out repairing of electrical appliances, otherwise
considerable danger for the user may result. Use only
genuine replacement parts. Do not use modified or
non-genuine parts.
Storing the Welder
When not in use the welder should be stored in the
dry and frost-free environment.
WARNING!
Before performing cleaning/main-
tenance, replacing cables / connections , make
sure the welding machine is switched off and dis-
connected from the power supply.
MMA (Stick) Basic
Welding Guide
Size of Electrodes
The electrode size is determined by the thickness of
metals being joined and can also be governed by
the type of welding machine available. Small weld-
ing machines will only provide current (amperage) to
run smaller sized electrodes.
For thin sections, it is necessary to use smaller elec-
trodes otherwise the arc may burn holes through the
job. A little practice will soon establish the most suit-
able electrode for a given application.
Storage of Electrodes
Always store electrodes in a dry place and in their
original containers.
Electrode Polarity
Electrodes are generally connected to the electrode
holder with the electrode holder connected positive
polarity.
The work lead is connected to the negative polarity
and is connected to the work piece. If in doubt con-
sult the electrode data sheet.
Effects of MMA(Stick) Welding
Various Materials
High Tensile and Alloy Steels
The two most prominent effects of welding these
steels are the formation of a hardened zone in the
weld area, and, if suitable precautions are not taken,
the occurrence in this zone of under-bead cracks.
Hardened zone and underbead cracks in the weld
area may be reduced by using the correct electrodes,
preheating, using higher current settings, using larg-
er electrodes sizes, short runs for larger electrode de-
posits or tempering in a furnace.
Manganese Steels
The effect on manganese steel of slow cooling from
high temperatures causes embrittlement. For this
reason it is absolutely essential to keep manganese
steelcool during welding by quenching after each
weld or skip welding to distribute the heat.
