Fuses (Items 1 And 3, Chapter 5.1); Preparation For Start-Up; Earth Connection - Soyer BMK-12 W Operating Instructions Manual

BMK-12 W
5.1.6

Fuses (items 1 and 3, chapter 5.1)

The BMK-12 W stud welder is protected by the following fuses:
- Fuse F1
- Fuse F2
Should it become necessary to replace fuses, only use fuses with the specified
electrical values. Oversized fuses could either cause defects to the electrical system
or a fire.
Disconnect the mains plug from the mains supply when replacing fuses!
5.2

Preparation for start-up

Connect the stud welding gun and earth cables to the stud welder prior to start-up.
5.2.1

Earth connection

• Attach earth cable to earth cable connector (item 12, chapter 5.1) and lock by turning
to the right until stop.
• Attach earth clamps to workpiece.
Ensure optimum contact with workpiece. Owing to the high welding current, an
unbalanced current distribution may cause a magnet 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 gun 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 nonhomogeneities in
material thickness, i.e. the material thickness varies by a few millimetres 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 gun.
0.315 A slow
2 A slow (with 400V up to 500V) or 3.15 AT with 230V
CAUTION
WARNING
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