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OPERATION CONTROL AND CONNECTORS
§4. 4 Welding operation
§4.4.1 Striking arc way
Knocking arc: take the electrode upright to touch the workpiece, after
forming short circuit, quickly lift up about 2~4 mm, and arc will be ignited.
This method is difficult to master. But in the welding for the brittle or hard
steel, it is better to use knocking way.
electrode
upright
workpiece
Take the electrode upright
electrode
1
weld
2
workpiece
3
electrode
electrode
up
workpiece
touch
workpiece
2 4mm
The Electrode touch the workpiece
～
Lift up for about 2-4mm
Lifting arc: take the electrode to
scrape the work piece for striking arc.
But it may cause the arc scratch, so
must to lift arc in the groove.
§4.4.2 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 form in MMA
In MMA welding, the common basic joint form: butt joint, lap joint, corner joint
12
1-electrode moving; 2-the electrode swing right & left; 3-the electrode move along weld
2
