14
www.strata.co.nz
EZIARC 160 • EZIARC200
Weld Build Up Sequence
(Fig 1-22)
Heavy plate will require several runs to complete the
joint. After completing the first run, chip the slag out
and clean the weld with a wire brush. It is important
to do this to prevent slag being trapped by the second
run. Subsequent runs are then deposited using either
a weave technique or single beads laid down
in the sequence shown in Figure 1-22. The width of
weave should not be more than three times the core
wire diameter of the electrode.
When the joint is completely filled, the back is either
machined, ground or gouged out to remove slag
which may be trapped in the root, and to prepare a
suitable joint for depositing the backing run. If a back-
ing bar is used, it is not usually necessary to remove
this, since it serves a similar purpose to the backing
run in securing proper fusion at the root of the weld.
B. Fillet Welds
These are welds of approximately triangular cross-
section made by depositing metal in the corner of two
faces meeting at right angles. Refer to Figure 1-14,
1-23 and 1-24.
A piece of angle iron is a suitable specimen with which
to begin, or two lengths of strip steel may be tacked
together at right angles. Using a 3.2mm E7014 Stick
electrode at 100 amps, position angle iron with one
leg horizontal and the other vertical. This is known as
a horizontal-vertical (HV) fillet.
Strike the arc and immediately bring the electrode to
a position perpendicular to the line of the fillet and
about 45º from the vertical. Some electrodes require
being sloped about 20º away from the perpendicular
position to prevent slag from running ahead of the
weld. Refer to Figure 1-23.
Do not attempt to build up much larger than 6.4mm
width with a 3.2mm electrode, otherwise the weld
metal tends to sag towards the base, and undercut
forms on the vertical leg. Multi-runs can be made as
shown in Figure 1-24. Weaving in HV fillet welds is
undesirable.
Electrode Position for HV
Fillet Weld (Fig 1-23)
45
o
from
vertical
60
o
-70
o
from
line of weld
The electrode needs to be moved along fast enough
to prevent the slag pool from getting ahead of the arc.
To complete the joint in thin plate, turn the job over,
clean the slag out of the back and deposit a similar
weld.
C. Vertical Welds
1. Vertical Up
Tack weld a three feet length of angle iron to your
work bench in an upright position. Use a 3.2mm
E7014 Stick electrode and set the current at 100
amps. Make yourself comfortable on a seat in front of
the job and strike the arc in the corner of the fillet. The
electrode needs to be about 10º from the horizontal to
enable a good bead to be deposited. Refer Fig. 1-25.
Multi-Runs in HV Fillet Weld
(Fig 1-24)
Single Run Vertical Fillet Weld
(Fig 1-25)
