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PUSH VS PULL TECHNIQUE
The type and thickness of the work piece
dictates which way to point the gun
nozzle. For thin materials (18 gauge and
up) and all aluminum, the nozzle should
point out in front of the weld puddle
and push the puddle across the
workpiece. For thicker steel, the nozzle
should point into the puddle to increase
weld penetration. This is called backhand
or pull technique
(See Figure 13).
ALUMINUM WELDING
Any aluminum surface to be welded,
must be cleaned thoroughly with a
stainless steel brush to eliminate any
oxides on the weld and grounding
surface. 100% Argon must be used
when welding aluminum. If Argon is not
used, metal penetration is unlikely.
9
WG3020
Figure 12 - Multiple Weld Passes
Welding Guidelines
(Continued)
WELDING POSITIONS
Four basic welding positions can be
used; flat, horizontal, vertical, and
overhead. Welding in the flat position
is easier than any of the others
because welding speed can be
increased, the molten metal has less
tendency to run, better penetration
can be achieved, and the work is less
fatiguing. Welding is performed with
the wire at a 45º travel angle and 45º
work angle.
Other positions require different
techniques such as a weaving pass,
circular pass, and jogging. A higher
skill level is required to complete these
welds.
Overhead welding is the least
desirable position as it is the most
difficult and dangerous. Heat setting
and wire selection will vary depending
upon the position.
All work should be performed in the
flat position if possible. For specific
applications, consult an arc welding
technical manual.
WELD PASSES
Sometimes more then one pass is
necessary to fill the joint. The root pass
is first, followed by filler passes and
the cover pass. If the pieces are thick, it
may be necessary to bevel the edges
that are joined at a 60º angle.
NOTE: Remember to remove the slag
before each pass for gasless process.
Figure 11 - Weld Passes
Cover
Filler
Root
1. Verify that welder is OFF and power
cord disconnected.
2. Remove welder cover to expose the
ON/OFF switch.
3. Disconnect the black and white
power cord wires connected to the
ON/OFF switch.
4. Disconnect the green power cord
wire connected to welder frame.
5. Loosen the cord strain screw(s) and
pull cord out of strain relief.
6. Install new cord in reverse order.
PUSH
PULL
Figure 13
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