5-23
R
Initiation
5.3 Preparation for initiation
Ꮨ MORTAL DANGER
Please observe the safety instructions in chapter 3. Do not yet connect the
stud welder to the mains supply.
Connect the stud welding pistol and earth cables to the stud welder prior to
initiation.
5.3.1 Earth connection
• Attach earth cable to earth cable connector (item 12, section 5.1) and lock
by turning to the right until stop.
• Attach earth clamps to workpiece.
Ensure optimum contact with workpiece.
☞ Due to the high welding current, an unbalanced current
distribution may cause a magnetic blow effect on the arc, i.e.
the arc for welding the stud is asymmetrical. This is shown by
an irregular course of the weld upset on the side of the stud.
The welding results are unsatisfactory and not reproducible.
For this reason, you should attach the earth clamps to the workpiece in such a
manner that the welding pistol is positioned as close as possible to the centre
of the connecting route of both earth clamps. This guarantees a current
distribution around the stud that is balanced to the largest possible extent and
satisfactory welding results.
Difficult areas are welds on the edge of the workpiece or greater non-
homogeneities in material thickness, i.e. the sheet thickness varies by a few
millimeters or additional material is welded or riveted to the metal. This also
includes stud welding on profile sections.
To ensure good welding results, carry out several test welds under different
conditions. For example, simply change the position of the earth clamps or turn
the welding pistol.
Please ensure that the contact areas of the earth clamps
☞ are always kept clean and do not oxidize, otherwise high
transition resistances could occur that may result in a
considerable reduction of the rated welding current.
In addition, make sure that the earth clamps are clamped securely to the
workpiece and the earth cables as well as the pistol cable are securely con-
nected to the stud welder. This prevents high transition resistances and arc
losses on the clamps or plug-in connections which in turn would result in poor
welding results.
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