15
GLC 353/503/553 MC3
Operating instructions
Instructions for welding
Non-coppered welding wires, aluminium and special
steel wires tend extremely to stick to the current tip in
the welding torch. Especially in the case of thin wires,
it often becomes necessary to take peak current
limitation measures for the ignition from the power
source, measures which can be supplied optionally.
The software in the GLC ....MC3 machines automatically
sets this peak current limitation, if required.
In the case of special steel wires a plastic core must be
installed in the welding torch, as this is basically required
for aluminium. In metal spirals are being produced
scorching points which considerably affect the wire
feed.
When MSG (metal shielded gas) welding the welding
wire is charged with the potential positive welding
current whereas the power source minus pole is often
connected to the mains protective conductor via earth
connection.
For this reason it is important that the welding wire in the
wire drive unit, the wire drum and the wire dereeler or
in its transport section does not touch the mains earth
conductor or the counter potential negative welding
current (welding compound).
This kind of short circuit causes the weld result to
deteriorate and may destroy components. There is a
risk of fire due to the hot welding wire sections.
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