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Hold the electrode almost
perpendicular to the work at all times
to obtain even melt-off of the flux.
Point the arc directly into the joint so
both edges are properly and
uniformly heated.
For tacking, use currents about 20%
above the maximum current listed in
the recommended ranges. Use a
short arc with a rotary motion.
Remove the last traces of slag with
warm water and a wire brush or by
soaking the weld in a 5% nitric acid or
10% warm sulfuric acid solution
followed by a warm water rinse.
WARNING: Be careful with these
strong acid solutions. Wear
safety glasses and avoid contact
with skin or clothing.
Avoid out-of-position welding.
Aluminweld can also be used as a
filler rod with a carbon arc torch.
DISTRIBUTED BY:
GUIDELINES FOR
WELDING CAST
IRON
(CONT.)
ALUMINUM ARC
WELDING
ELECTRODES
good procedures are followed. If the
casting must be water tight, this can
be a problem. However, leaking can
usually be eliminated with some sort
of sealing compound or they may rust
shut very soon after being returned to
service.
The Studding Method - One method
used to repair major breaks in large
castings is to drill and tap holes over
the beveled surface area. Screw
studs into the holes leaving 3/16”
(4.8mm) to 1/4” (6.4mm) of the stud
above the surface. Then, using the
standard methods and electrodes
described here, weld the studs in
place and cover the entire surface of
the break with weld deposit. Once a
good weld deposit layer is made, the
two sides of the crack can be welded
together with more conventional
methods. However, overheating the
casting area must still be avoided.
In cases of severe damage, use of
mild steel plates sometimes produces
good results. To do this, cut out the
damaged area. Fit a piece of mild
steel of the appropriate size in the
damaged area and weld the steel to
the cast iron. Use the welding
methods and electrodes used to
weld cast iron to cast iron.
PROCEDURES - USE ELECTRODE
POSITIVE (DC+)
Hold a short arc with the coating
almost touching the molten pool.
Use the highest current possible
without melting the edges back
too far or burning through.
The high melting rate of the aluminum
electrode combined with the high
conductivity of the aluminum plate
chills the weld rapidly. Therefore, to
keep the pool molten long enough to
form well-shaped beads preheating to
600-700°F is often needed.
Strike the electrode by “scratching”.
Strike the arc in the crater of the
previous bead, then quickly move
back along the weld for 1/2”
(12.7mm) and proceed as usual. Be
sure the crater is completely remelted.
THE
LINCOLN ELECTRIC
COMPANY
Local Sales and Service through Global
Subsidiaries and Distributors
Cleveland, Ohio 44117-1199 U.S.A
TEL: 216.481.8100
FAX: 216.486.1751
WEB SITE: www.lincolnelectric.com
Cast Iron/Non-Ferrous
C8.10 6/99
web update 5/08
Customer Assistance Policy
The business of The Lincoln Electric Company is manufacturing and selling high quality welding equipment, consumables, and cutting equipment. Our challenge is to meet the needs of
our customers and to exceed their expectations. On occasion, purchasers may ask Lincoln Electric for advice or information about their use of our products. We respond to our customers
based on the best information in our possession at that time. Lincoln Electric is not in a position to warrant or guarantee such advice, and assumes no liability, with respect to such
information or advice. We expressly disclaim any warranty of any kind, including any warranty of fitness for any customer’s particular purpose, with respect to such information or advice. As
a matter of practical consideration, we also cannot assume any responsibility for updating or correcting any such information or advice once it has been given, nor does the provision of infor-
mation or advice create, expand or alter any warranty with respect to the sale of our products.
Lincoln Electric is a responsive manufacturer, but the selection and use of specific products sold by Lincoln Electric is solely within the control of, and remains the sole responsibility of the
customer. Many variables beyond the control of Lincoln Electric affect the results obtained in applying these type of fabrication methods and service requirements.