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30: Know and Understand
In the GMAW process, the arc is shielded from atmospheric contaminants by a(n) _____ gas supplied from a compressed gas cylinder.
Describe the type of electrode used for FCAW welding.
Most commonly, a constant-_____ power source with DC current is used for GMAW welding.
Setting the wire feed speed determines the inches per minute of electrode supplied at the weld and regulates the welding _____.
The contact tip serves as the electrical connection to the electrode and is attached to the _____ in the welding torch.
Dual-shield welding is accomplished by using GMAW equipment, a compressed shielding gas, and a(n) _____ electrode.
Using CO2 as a shielding gas provides very deep weld penetration but generates more _____ in the weld pool.
What special tool is used by welders when changing an electrode wire?
Why is the short-circuit method of metal transfer ideal for thin materials such as sheet metal?
Surface contaminants must be removed from metal before it is welded in order to prevent _____ in the finished bead.
The size of an electrode wire for a particular welding job is selected according to the _____ of the base metal.
Whenever possible, work should be positioned so the welder can weld in the _____ position.
What effect does increasing the stickout have on resistance and heat input?
Why is the forehand welding technique preferred for welding thin materials?
The GMAW welding gun lead should be positioned to avoid tight coils to reduce the chances of the electrode binding as it passes through the _____.
How should a welder pick up a loose piece of scrap?
On a practice pad, each bead should overlap the previous bead by _____%.
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