Parweld XTI-201 - Operation; MMA Welding Guide; TIG Welding Guide

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area may be reduced by using the correct electrodes,
preheang, using higher current sengs, using larger
electrodes sizes, short runs for larger electrode
deposits or tempering in a furnace.
Manganese steels
The eect on manganese steel of slow cooling from
high temperatures is enbrilement. For this reason it
is absolutely essenal to keep manganese steel cool
during welding by quenching aer each weld or skip
welding to distribute the heat.
Cast iron
Most types of cast iron, except white iron, are
weldable. White iron, because of its extreme
brileness, generally cracks when aempts are made
to weld it. Trouble may also be experienced when
welding white-heart malleable, due to the porosity
caused by gas held in this type of iron.
Copper and alloys
The most important factor is the high rate of heat
conducvity of copper, making preheang of heavy
secons necessary to give proper fusion of weld and
base metal.
6.0 Operaon
WARNING
When using an open arc process, it is necessary to
use correct eye, head, and body protecon.
6.1 MMA Welding Guide
Eects of MMA welding various materials
High tensile and alloy steels
The two most prominent eects of welding these
steels are the formaon of a hardened zone in the
weld area, and, if suitable precauons are not taken,
the occurrence in this zone of under-bead cracks.
Hardened zone and under-bead cracks in the weld
Types of electrodes
Arc welding electrodes are classied into a number
of groups depending on their applicaons. There are
a great number of electrodes used for specialized
industrial purposes which are not of parcular interest
for everyday general work. These include some low
hydrogen types for high tensile steel, cellulose types
for welding large diameter pipes, etc. The range of
electrodes dealt with in this publicaon will cover the
vast majority of applicaons likely to be encountered;
are all easy to use and all will work on even the most
basic of welding machines.
Metals being joined & electrode comments
Mild steel
6013 ideal electrodes for all general purpose work.
Features include outstanding operator appeal, easy
arc starng and low spaer.
Mild steel
7014 all posional electrode for use on mild and
galvanized steel furniture, plates, fences, gates, pipes
and tanks etc. Especially suitable for vercal down
welding.
Cast iron
99% nickel suitable for joining all cast irons except
white cast iron
Stainless steel
318l-16 high corrosion resistance. Ideal for dairy work,
etc. On stainless steels.
6.2 Basic TIG Welding guide
Tig welding cable connecon
Connect the TIG torch to the - terminal and the work
OPERATION