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lower fusion error tolerance.
Welded joints
There are two-basic types of joints in
welding: Butt welds (outer edge) and angle
welding (inner edge and overlapping).
Butt welds
With butt welds of up to 2 mm material
thickness, the weld edges are completely
brought together.
For greater thicknesses, a gap of 0.5–4 mm
must be selected. The ideal gap depends
on the welded material (aluminium or steel),
the material composition as well as the
type of welding selected. This gap should
be determined by welding on a sample
workpiece.
Flat butt welds
Welds should be made without interruption
and with a sufficient penetration depth.
Therefore, it is extremely important to be
well prepared. The quality of the weld
result is affected by: the amperage, the gap
between weld edges, the inclination of the
torch and the diameter of the welding wire.
The steeper you hold the torch against the
workpiece, the higher the penetration depth
and vice versa.
S
To forestall or reduce deformations that
can happen during the material hardening
process, it is good to fix the workpiece
with a device. Avoid stiffening the welded
structure to prevent cracks in the weld.
These problems can be avoided if there is a
possibility of turning the workpiece so that
the weld can be carried out in two passes
20
GB/IE/NI
running in opposite directions.
Welds on the outer edge
The preparation for this is very simple
(Fig. T, U).
T
U
However, it is no longer expedient for thicker
materials. In this case, it is better to prepare
a joint as shown below, in which the edge of
the plate is angled (Fig. V).
V
Fillet weld connections
A fillet weld is created if the workpieces are
perpendicular to each other. The weld should
be shaped like a triangle with sides of equal
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