Tig Dc; Choice Of Electrode - Cebora 553 Manual De Instrucciones

5�7

TIG DC

This welding machine is suitable for welding using the TIG procedure: stainless steel, iron, and copper.
♦ Connect the ground cable connector to the positive pole (C) of the welding machine, and the terminal to
the workpiece as close as possible to the welding point, making sure there is good electrical contact.
♦ Connect the power connector of the TIG torch to the negative pole (D) of the welding machine.
♦ Connect the torch connector to connector of the welding machine.
♦ Connect the fitting of the torch gas hose to the E machine connector and the gas hose coming from the
cylinder pressure regulator to the gas fitting H.
♦ Turn on the machine.
♦ Set the welding parameters as described in section 3.2.
♦ Do not touch live electrical parts and output terminals when the machine is powered.
♦ The inert gas flow must be set at a value
♦ (liters per minute) approximately 6 times the electrode diameter.
♦ If gas-lens type accessories are used, the gas delivery can be reduced by approximately 3 times the
electrode diameter.
♦ The ceramic nozzle diameter must be between 4 and 6 times the electrode diameter.
Normally, the gas most frequently used is ARGON because it costs less than the other inert gases. However, ARGON
mixtures can also be used, with max. 2% HYDROGEN for welding stainless steel and HELIUM or ARGON-HELIUM
mixtures for welding copper.
These mixtures increase the heat of the arc while welding, but they are also much more costly. If HELIUM gas is used,
increase the liters per minute up to 10 times the diameter of the electrode (e.g. diameter 1.6 x10= 16 lt/min of Helium).
Use D.I.N. 10
protective glass until 75A and D.I.N. 11 from 75A on.
5�8

Choice of electrode

Table 6
Name
W
WT20
Optimum
ignition quality
WT30
WC20
WL20
Colour Description
Green PURE TUNGSTEN Particularly suitable for welding
light metals and metal alloys (aluminium)
Red 2% THORIATED TUNGSTEN
DC
Lilac 3% THORIATED TUNGSTEN Optimum ignition
quality, better than WT20
Grey 2% CERIATED TUNGSTEN Optimum durability, but
striking more difficult than with thoriated electrodes.
Blue 2% LANTHANUM ideal as a more durable
replacement for thoriated electrodes in automated
systems that weld stainless steel with direct current.
During use, the tip stays cleaner with no change to
the geometry
Process
AC/DC
DC
AC/DC
DC
69/89