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PowerPoint ® Presentation Chapter 19 GMAW–Equipment Gas Metal Arc Welding GMAW Current Selection GMAW Welding Power Sources GMAW Equipment GMAW Welding Wire
Chapter 19GMAW–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.
Chapter 19GMAW–Equipment CV power sources are self-correcting with respect to arc length, which means that arc length remains constant with changes in electrode extension.
Chapter 19GMAW–Equipment GMAW equipment includes a welding gun cable and gun assembly, a wire feeder, shielding gas, and a workpiece lead with a workpiece connection.
Chapter 19GMAW–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.
Chapter 19GMAW–Equipment Welding guns are available with curved or straight conductor tubes.
Chapter 19GMAW–Equipment The wire feeder may be portable, mounted on the welding machine, or mounted elsewhere to facilitate welding in a large area.
Chapter 19GMAW–Equipment Drive roll grooves can be U-shaped, V-shaped, or knurled depending on the type of welding wire.
Chapter 19GMAW–Equipment The wire outlet guide must be aligned closely with the groove in the drive rolls, without touching it.
Chapter 19GMAW–Equipment Inert gases do not react readily with other materials, making them useful as shielding gases for arc welding.
Chapter 19GMAW–Equipment Different shielding gases produce different weld bead contour and penetration characteristics.
Chapter 19GMAW–Equipment The welding area should be protected with windbreaks to prevent gas drifts.
Chapter 19GMAW–Equipment The American Welding Society (AWS) classification system for carbon steel electrodes consists of a series of letters and numbers.
Chapter 19GMAW–Equipment The American Welding Society (AWS) has developed similar classification systems for metals other than carbon steel.
Chapter 19GMAW–Equipment Welding position and the type of metal to be welded are factors that must be considered when selecting welding wire.
2 © 2012 Delmar, Cengage Learning Chapter 3 Shielded Metal Arc Welding, Setup, and Operation.
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