Lincoln Electric IM348 AC-225-GLM - Manual (Page 13)

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Fillet Welds
When welding fillet welds, it is very important to hold the
electrode at a 45° angle between the two sides, or the metal
will not distribute itself evenly.
To make it easy to get the 45° angle, it is best to put the
electrode in the holder at a 45° angle, as shown:
Multiple Pass Welds
Make multiple pass horizontal fillets as shown in the
sketch. Put the first bead in the corner with fairly high cur-
rent. Hold the electrode angle needed to deposit the filler
beads as shown putting the final bead against the vertical
plate.
Welding in the Vertical Position
Welding in the vertical position can be done either vertical-
up or vertical-down. Vertical-up is used whenever a large,
strong weld is desired. Vertical-down is used primarily on
sheet metal for fast, low penetrating welds.
Vertical-Up Welding
The problem, when welding vertical-up, is to put the
molten metal where it is wanted and make it stay there. If
too much molten metal is deposited, gravity will pull it
downwards and make it “drip.’’ Therefore a certain tech-
nique has to be followed:
1. Use 1/8" (90-105 amps) or 3/32" (60 amps) Fleetweld
180 electrode.
2. When welding, the electrode should be kept horizontal
or pointing slightly upwards. (See drawing.)
3. The arc is struck and metal deposited at the bottom of
the two pieces to be welded together.
4. Before too much molten metal is deposited, the arc is
SLOWLY moved 1/2-3/4" upwards. This takes the heat
away from the molten puddle, which solidifies. (If the
arc is not taken away soon enough, too much metal will
be deposited, and it will “drip.’’)
5. The upward motion of the arc is caused by a very slight
wrist motion. Most definitely, the arm must not move in
and out, as this makes the entire process very complicat-
ed and difficult to learn.
6. If the upward motion of the arc is done correctly with a
wrist motion, the arc will automatically become a long
arc that deposits little or no metal. (See drawing.)
7. During this entire process the ONLY thing to watch is
the molten metal. As soon as it has solidified, the arc is
SLOWLY brought back, and another few drops of metal
are deposited. DO NOT FOLLOW THE UP AND
DOWN MOVEMENT OF THE ARC WITH THE
EYES. KEEP THEM ON THE MOLTEN METAL.
8. When the arc is brought back to the now solidified pud-
dle, IT MUST BE SHORT, otherwise no metal will be
deposited, the puddle will melt again, and it will “drip.”
9. It is important to realize that the entire process consists
of SLOW, DELIBERATE movements. There are no fast
motions.
Vertical-Down Welding
Vertical-down welds are applied at a fast pace. These welds
are therefore shallow and narrow, and as such are excellent
for sheet metal. Do not use the vertical-down technique on
heavy metal. The welds will not be strong enough.