14
Lifting arc: take the electrode to scrape the workpiece for striking arc. But it may cause the
arc scratch, so must to lift arc in the groove.
electrode
workpiece
electrode
electrode
workpiece
workpiece
Scrape the workpiece for
strinking arc
Electrode touch
workpiece
Lift up for about 2-4mm
scrape
up
touch
2
~
4mm
Fig 4.8 the method of lifting arc
§4.4.3 Manipulation of electrode
In MMA welding, there are three motions
to being matched in the end of electrode: the
electrode moving to the molten pool along axes;
the electrode swing right and left; the electrode
moving along welding way.
The operator can choose the manipulation of
electrode based on welding joint sharp, welding
position, electrode spec, welding current and
operation skill, etc. The details please refer to
《
Welding
Dictionary
》
P69, Volume 1 of Edition 2.
§4.5 Welding Parameters
§4.5.1 Joint forms in TIG/MMA
Fig 4.10 joint forms of welding
A. butt joint
B. corner joint
C. lap joint
D. T joint
electrode
workpiece
weld
1
2
3
2
Fig 4.9 the rule of welding motions
