Scheppach WSE5000-Multi Traduction Du Mode D'emploi Original page 37

• If the welding current is too low, the welding wire
cannot melt properly. As a result, the welding wire
repeatedly dips into the weld pool right down to the
workpiece.
• The slag should only be removed from the seam
once it has cooled. To continue a weld on an inter-
rupted seam:
• First remove the slag at the attachment point.
• The electric arc is struck in the weld groove, guided
to the connection point, properly melted there and
then continued along the weld seam
Setting suitable parameters for current and volt-
age for welding aluminium with aluminium wire.
Lower voltages are recommended for welding alumin-
ium than for welding iron/steel. To set the appropriate
voltage range, proceed as follows:
• Prepare the unit as described previously under "De-
vice setting for welding with inert gas". For weld-
ing aluminium wire, select the setting "1.0/Al (23)" by
pressing the selection button (26).
• Now the voltage for MIG welding can be varied with-
in a lower voltage range suitable for aluminium weld-
ing. The welding current can be varied by turning the
rotary switch for welding current adjustment (4). For
welding 2 mm aluminium sheet, 14.5 volts and a cur-
rent of 91 amperes can be set as guide values. The
optimum welding settings should be determined on
a test workpiece.
Attention! Ensure that the burner is always set down
on an insulated surface after welding.
• Always switch the welding machine off and pull the
mains plug out of the socket after the welding work
is complete and during breaks
Creating a weld seam
Forward-pointing welding or butt welding
The burner is pushed forward. Result: The penetration
depth is smaller, seam width larger, seam top bead
(visible surface of the weld) flatter and the fusion fault
tolerance (defect in material melting) larger.
Drag weld seam or draw welding
The torch is pulled away from the weld. Result: The
penetration depth is greater, the seam width smaller,
the seam top bead higher and the fusion fault tolerance
smaller.
Welded joints
There are two basic types of connection in welding
technology:
Butt joint (outside corner) and fillet joint (inside corner
and overlap).
Butt weld joints
For butt joints up to 2 mm material thickness, the weld
edges are brought completely together. For larger
thicknesses, a distance of 0.5 - 4 mm should be cho-
sen. The ideal spacing depends on the welded material
(aluminium or steel), the material composition and the
selected welding method.
This distance should be determined on a test piece.
Flat butt weld joints
Welds should be carried out without interruption and
with sufficient penetration, so good preparation is ex-
tremely important. The quality of the resultant weld is
influenced by: the current intensity, the distance be-
tween the welding edges, the inclination of the torch
and the diameter of the welding wire. The steeper the
torch is held in relation to the workpiece, the higher the
penetration depth and vice versa.
Fillet weld joints
A fillet weld is created when the workpieces are per-
pendicular to each other. The seam should have the
shape of a triangle with sides of equal length and a
slight valley.
Overlapping weld joints
The most common preparation is the one with straight
welding edges. The weld can be resolved with a normal
angled weld. The two workpieces must be brought as
close together as possible.
In order to anticipate or reduce deformations that can
occur during material hardening, it is good to fix the
workpieces with a clamping device. Avoid stiffening
the welded structure to prevent fractures in the weld.
These difficulties can be reduced if it is possible to ro-
tate the workpiece so that the welding can be carried
out in two opposite passes.
Wire diameter in mm x 10 = Gas flow in l/min
For a 0.8 mm wire, for example, this results in a value
of approx. 8 l/min.
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