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WELDING GUIDELINES
General
The DW3130 can utilize the Flux Cored Arc
Welding (FCAW) process or the Gas Metal Arc
Welding (GMAW) process. The weld must be
protected (shielded) from contaminants in
the air while it is molten. The FCAW process
uses a tubular wire with a flux material
inside. The flux creates a shielding gas when
melted. The GMAW process uses inert gas to
shield the weld while molten.
When current is produced by a transformer
(welding machine) and flows through the
circuit to the weld wire, an arc is formed
between the end of the weld wire and the
work piece. This arc melts the wire and the
work piece. The melted metal of the weld
wire flows into the molten crater and forms
a bond with the work piece as shown (Figure
5).
Arc Welding Basics
Six basic techniques affect weld quality. These are: wire selection, heat setting, weld angle, wire speed,
travel speed, and electrode extension. An understanding of these techniques is necessary for effective
welds.
HEAT SETTING
The correct heat involves the adjustment of the welding machine to the required setting. Heat or voltage is
regulated by a switch on the welder. The heat setting used depends on the size (diameter) and type of wire,
position of the weld, and the thickness of the work piece. Consult specifications listed on the welder. It is
suggested that the welder practice with scrap metal to adjust settings, and compare welds with Figure 7.
WIRE TYPE AND SIZE
The correct choice of wire type involves a variety of factors, such as welding position, work piece material
type, thickness, and condition of surface to be welded. The American Welding Society, AWS, has set up
certain requirements for each type of wire.
FLUX-CORED WIRE
E - 7 0 T - GS
AWS E71T-GS or E71T-11 is recommended for this welder.
SOLID WIRE
ER - 70 S - 6
ER-70S6 is recommended for this welder.
Weld
Figure 5 - Weld Components
Weld strength, times 10,000 pounds per square inch
Welding positions (0 for flat or horizontal, 1 for any position)
Tubular flux-cored wire
Flux type
Weld strength, times 1,000 PSI
Solid wire
Wire composition
11
Nozzle
Shielding Gas
Slag
Crater
Contact Tip
Flux
(Gasless only)
Wire
Work piece
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