Miller 900 028 설치 및 운영 매뉴얼 - 페이지 16
{카테고리_이름} Miller 900 028에 대한 설치 및 운영 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Miller 900 028 25 페이지.
페이지 인쇄
provide
fusion
into
the
corner
and
a
fillet,
the
sides
of
which will be
approximately equal.
For
maximum
strength
a
fillet weld should be de
posited
on
each side of the
upright
section. When
a
heavier
fillet is
needed, deposit
a
second
layer
as
indicated
in
Figure 17.1, using
any
of the
weav
ing
patterns
shown
in
Figure
17.2.
The
lap
joint,
while
involving
the
same
funda
mental weld
type,
the
fillet,
has metal
distributed
differently
and
therefore
requires
still
another
technique.
The details of the
application
are
given
in
Figure
18.1,
for
a
single
pass
weld. For
a
two
pass weld
Figure
18.2
provides
the details.
WELDING
VERTICALLY,
HORIZONTALLY
AND OVERHEAD
The
importance
of
welding
in
the flat
position,
whenever
possible,
cannot
be stressed
too
strongly.
The
quality
of the weld is
better,
the
operation
easier and
faster.
However,
occasions
will
arise
when it is
necessary
to
work
on
parts
fixed
in
position
under
which conditions welds
must be
deposited horizontally,
vertically
and
overhead.
It
must
be realized
at
the
very
beginning
that
welding
in these
positions
is
difficult and will
re
quire
constant
practice
to
develop
skill.
As in the
case
of
welding
in
the flat
position,
it is
best
to start
practicing
by
first
running
bead
welds in
the
various
positions.
Then
as
facility
is
gained
on
these
operations
practice
may be
con
tinued
on
butt and fillet welds
(tee
and
lap joints)
in
these
positions.
One of the first facts noted when
welding
in
these
positions
is
that the force of
gravity
tends
to
cause
the molten metal
to
drip
(fall)
down. The
technique used, therefore,
must
be
designed
to
overcome
this and since it is difficult it is best to
approach
this
by
steps.
To
accomplish this,
start
by making
horizontal bead welds
on
plates
in
clined
at 45
degrees
as
shown
in
Figure
19.1. When
~ORIGHT~/~
Figure
19.1
this has been mastered
so
that uniform beads
can
be made
consister~tly, practice
on
welding
ver
tically
may
be started.
Again
begin
with
an
easy
operation
such
as
running
beads
vertically
on
plates
set at
45
degreessee
Figure
20.1.
SQUARE
BOX
WEAVE
Figure
17.2
RIGHT TO LEFT
7/
90
Figure
18.2
Figure
20.1
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