●
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.
§
4.3.2 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.
§
4.4 Welding parameters
§
4.4.1 Joint form in MMA
In MMA welding, the common basic joint form: butt joint, lap joint, corner joint & T joint.
§
4.4.2 Electrode selection
The electrode diameter selection is based on the workpiece thickness, welding position, joint form,
welding layer, etc. Please refer to the following table.
The welding current reference for different electrode diameter
Electrode diameter/mm
1.6
2.0
2.5
3.2
Welding current / A
25 - 40
40 - 60
50 - 80
100 - 130
The relation between the welding current (I)
’ factor (K) & electrode diameter (d)(I=K
×
d: Carbon electrode)
Electrode diameter / mm
1.6
2
– 2.5
3.2
Factor / K
20 - 25
25
– 30
30 - 40
Notice: the above parameters originate from <welding dictionary> P66
– P67
Volume 1 of Edition2
●
Electrode should be drying according to user manual before using. For reducing the hydrogen of the
molten pool and welding seam, and avoiding the blowhole and cold crack.
Summary of Contents for INARC 200 IDS
Page 18: ...5 3 Electrical principle drawing INARC 200 IDS...
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