Walter 630571, Operating Manual

Page: 48 / 132

Before Use
48
EN
• The factors which affect the quality of
the welding are the current, the distance
between the welding edges, the tilt of the
electrode and the corresponding diameter.
• Avoid stiffening of the welded structure to
prevent breakages as far as possible in the
weld. These difficulties can be reduced. If
at all possible, rotate the workpiece so that
the structure can be welded in two opposite
places. In this case the electrode must be
kept inclined at 50 / 70° to the vertical axis
going through the joint. Advance steadily
with a light cross oscillation.
• The electrode is held
at an angle of 45 ° /
55 ° to the horizontal
surface, which passes
through the welding
axis. Remember that
increasing the value
mentioned above results in increased
penetration and vice versa.
• If possible, fix the work pieces with clamps or
clips to prevent deformation during material
hardening.
External corner joints
The preparation for this
type is very simple, but it
is no longer appropriate
for thicknesses exceeding
10 mm. In this case, it is
preferable to prepare a joint
as shown in the second
figure.
Flat butt joints
Frontal butt welded joints
The weld must be
performed in a single
operation with sufficient
penetration of the base
material. For this reason
it is important to prepare
well.
Up to a thickness of
approximately 4mm it is
not necessary to prepare
a junction. The welding
is carried out with the
electrode at an angle of
90° + 15° as shown in the
figure.
Internal corner joints
This joint is very simple
to achieve, and is used
for materials up to
5mm thickness. The
value of 'd' should
be kept to a minimum
and should in no
circumstances be less
than 2 mm.
Overlap joints
The most common
preparation is with right
angle edges; the weld is
completed with a standard
angle cord. The two
workpieces have to be as
close together as possible.