Miller 900019 Manual de instalación y funcionamiento - Página 19
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1st
PASS
3rd PASS
Welding
in
the overhead
position
is the
final
problem
to
master.
Again proceed through
the
steps
of
making
bead
welds,
the
making
of butt
welds and
finally
the
making
of fillet welds. For
bead welds
the electrode
position, Figure 29.1,
will prove
helpful.
When
weaving
is necessary,
the
pattern
in
Figure
30.1 may be used. The
tech
nique
for overhead butt welds is illustrated in
Figure
31.1;
this
covers
single
pass welds
or
the
first pass of
multilayer
welds.
Subsequent
beads
may
be
deposited
as
shown
in
Figure
32.1. For
depositing single layer
fillets
or
the first
layer
of
multiple
fillets
in the
overhead
position
the tech
nique
in
Figure
33.1
should be
employed.
The
sequence
for
depositing
beads
on
a
multilayer
fillet weld is
provided
in
Figure
34.1. Note that
single
beads
are
recommended and for that
reason
~
4,
use
the
same
technique
shown
in
Figure
33.1.
Again
the
technique
for
fillet welds may be
em
ployed
for
welding lap joints.
Figure
30.1
Figure
34.1
CONCLUSION
It may be
appreciated
that
no
printed
instruc
tion
can
impart
to
the
beginner
the skill necessary
for successful
welding.
Personal
instruction
by
an
experienced welding
operator
is the best
means
devised
to
date for the
accomplishing
this end.
Therefore,
an
effort
should
be made
to
secure
some
facility
for instruction and
practice
under
competent supervision.
In any
event
the
beginner
should
at
least
secure
the benefit of criticism of
finished welds
by
a
qualified
welder.
CURRENT
REQUIREMENTS
FOR MILD
STEEL
ELECTRODES
Figure
29.1
r
DIRFXTtON
OF
WELDING
\
?
L
I
I
ti
Figure
31.1
V.
Figure
31.2
Electrode
Diameter
5/64
3/32
1/8
5/32
3/16
Amperage
Mm.
Max.
20
50
40
80
65
125
90
160
120
180
IOM-114A-
Page
17