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7.5.6
Electrode selection
The electrode diameter selection is based on the
workpiece thickness, welding position, joint form, welding
layer, etc. Please refer to the recommendations on the
electrode package for further details.
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To ensure good quality weld, the electrode should
always be dried or dry stored. This to avoid hydrogen
inclusion, blowholes and cold cracks.
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In the welding process, the arc must not be too long;
otherwise, it will cause unstable arc burning, large
spatter, light penetration, undercut, blowhole, etc. If the
arc is too short, it will cause electrode stick.
7.6
L-GTAW welding
L-GTAW welding melts the metal of the workpiece, using an arc
struck from a tungsten electrode, which does not itself melt. The weld
pool and the electrode are protected by shielding gas.
L-GTAW welding is particularly useful where high quality is demanded and for
welding thin plate. The power sources also have good characteristics for L-GTAW
welding.
In order to L-GTAW weld, the power sources must be equipped with:
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a torch with gas valve (See Accessories, page 51)
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a welding gas cylinder (a suitable welding gas)
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a welding gas regulator (suitable gas regulator)
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tungsten electrode
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suitable auxiliary material, if necessary.
Move process selector switch to desired welding process.
NOTE: Power source output is enabled.
Check welding cable and torch polarity matches electrode requirements.
Select desired welding current level.
7.6.1
Welding current setting
The power source has an adjustable range from 5 to 160 Amps.
(230V input supply) and 5-110 Amps. (115V input supply).
bh43a
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© ESAB AB 2012
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