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PowerPoint® PresentationPowerPoint® Presentation
Chapter 19Chapter 19GMAW–EquipmentGMAW–Equipment
Gas Metal Arc Welding • GMAW Current Selection • GMAW Welding
Power Sources • GMAW Equipment • GMAW Welding Wire
Gas Metal Arc Welding • GMAW Current Selection • GMAW Welding
Power Sources • GMAW Equipment • GMAW Welding Wire
Chapter 19—GMAW–Equipment Chapter 19—GMAW–Equipment
Constant-current (CC) power sources have a steep volt-ampere (V-A) curve, while constant-voltage (CV) power sources have a slightly sloping V-A curve.
Constant-current (CC) power sources have a steep volt-ampere (V-A) curve, while constant-voltage (CV) power sources have a slightly sloping V-A curve.
Chapter 19—GMAW–Equipment Chapter 19—GMAW–Equipment
CV power sources are self-correcting with respect to arc length, which means that arc length remains constant with changes in electrode extension.
CV power sources are self-correcting with respect to arc length, which means that arc length remains constant with changes in electrode extension.
Chapter 19—GMAW–Equipment Chapter 19—GMAW–Equipment
GMAW equipment includes a welding gun cable and gun assembly, a wire feeder, shielding gas, and a workpiece lead with a workpiece connection.
GMAW equipment includes a welding gun cable and gun assembly, a wire feeder, shielding gas, and a workpiece lead with a workpiece connection.
Chapter 19—GMAW–Equipment Chapter 19—GMAW–Equipment
Welding gun components include a handle with a conductor tube and trigger, a contact tip, a gas nozzle, a gas diffuser, and an insulator.
Welding gun components include a handle with a conductor tube and trigger, a contact tip, a gas nozzle, a gas diffuser, and an insulator.
Chapter 19—GMAW–Equipment Chapter 19—GMAW–Equipment
Welding guns are available with curved or straight conductor tubes.
Welding guns are available with curved or straight conductor tubes.
Chapter 19—GMAW–Equipment Chapter 19—GMAW–Equipment
The wire feeder may be portable, mounted on the welding machine, or mounted elsewhere to facilitate welding in a large area.
The wire feeder may be portable, mounted on the welding machine, or mounted elsewhere to facilitate welding in a large area.
Chapter 19—GMAW–Equipment Chapter 19—GMAW–Equipment
Drive roll grooves can be U-shaped, V-shaped, or knurled depending on the type of welding wire.
Drive roll grooves can be U-shaped, V-shaped, or knurled depending on the type of welding wire.
Chapter 19—GMAW–Equipment Chapter 19—GMAW–Equipment
The wire outlet guide must be aligned closely with the groove in the drive rolls, without touching it.
The wire outlet guide must be aligned closely with the groove in the drive rolls, without touching it.
Chapter 19—GMAW–Equipment Chapter 19—GMAW–Equipment
Inert gases do not react readily with other materials, making them useful as shielding gases for arc welding.
Inert gases do not react readily with other materials, making them useful as shielding gases for arc welding.
Chapter 19—GMAW–Equipment Chapter 19—GMAW–Equipment
Different shielding gases produce different weld bead contour and penetration characteristics.Different shielding gases produce different weld bead contour and penetration characteristics.
Chapter 19—GMAW–Equipment Chapter 19—GMAW–Equipment
The welding area should be protected with windbreaks to prevent gas drifts.
The welding area should be protected with windbreaks to prevent gas drifts.
Chapter 19—GMAW–Equipment Chapter 19—GMAW–Equipment
The American Welding Society (AWS) classification system for carbon steel electrodes consists of a series of letters and numbers.
The American Welding Society (AWS) classification system for carbon steel electrodes consists of a series of letters and numbers.
Chapter 19—GMAW–Equipment Chapter 19—GMAW–Equipment
The American Welding Society (AWS) has developed similar classification systems for metals other than carbon steel.
The American Welding Society (AWS) has developed similar classification systems for metals other than carbon steel.
Chapter 19—GMAW–Equipment Chapter 19—GMAW–Equipment
Welding position and the type of metal to be welded are factors that must be considered when selecting welding wire.
Welding position and the type of metal to be welded are factors that must be considered when selecting welding wire.
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