ESAB TXH 120, Instruction Manual, Page: 12 / 21

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5 OPERATION
General safety regulations for the handling of the equipment can be found on
page 10 . Read through before you start using the equipment!
Please also read the operating instructions for the welding components, e.g. power
source and connect accordingly.
5.1 Connections
Tighten the connections for the torch carefully to avoid overheating the connection,
connection interference, mechanical damage or leakage of liquid or gas.
Connect water connections to the torch so that the red terminal is always connected
to the corresponding red terminal and the blue terminals are always connected to the
corresponding blue terminals.
5.2 Choice of electrode
By alloying the tungsten electrode with 1% to 2% lantha or cerium the electron
discharge is increased, which gives better striking and restriking and therefore
increased arc stability. Alloyed tungsten electrodes have a longer service life,
tolerate higher currents and are less likely to leave tungsten residue in the weld.
Pure tungsten electrode (AC) -- Green,
WP
used when welding light metal alloys
Ceriumlegerad volframelektrod
(AC/DC) -- Grey, WC20
used when welding light metals such as aluminium and
magnesium. Electrode tip must be rounded when
welding
Lantha alloyed tungsten electrod (DC)
-- Gold, WL15
usually used when welding stainless steel, steel,
copper, titanium etc.
Lantha alloyed tungsten electrod
(AC/DC) -- Black, WL10
used when welding light metal alloys, stainless steel,
steel, copper, titanium etc.
Selection table
A / AC A / DC
W CeO
2
La
2
O
3
CeO
2
La
2
O
3
1.0 6.4/ 8.0 10--60 -- 15--100 70--80 20--100
1.6 6.4/8.0/9.8 50--100 60--90 70--160 80--140 80--160
2.4 9.8/11.2 /2.7 100--160 90--130 110--200 150--210 120--230
3.2 11.2/12.7 130--180 140--190 150--205 220--320 200--305
4.0 12.7 180--230 200--250 180--270 330--420 250--420
GB