The basics of semiautomatic welding
- Esab Group, Florence, SC (United States)
- Esab Group, Hanover, PA (United States)
By definition, gas metal arc welding (GMAW) and flux cored arc welding (FCAW) are semiautomatic processes in which a consumable electrode is fed into a weld at a controlled rate, while in most cases a continuous blanket of gas shields the weld zone from contamination by the atmosphere. Semiautomatic welding includes five distinctive techniques or process variations, known as short circuiting, spray transfer, pulsed spray, gas shielded flux cored, and self-shielded flux cored welding. Short circuiting welding operates on generally lower arc voltages and amperages than spray transfer. This process pinpoints the arc heat and produces a small fast-freezing weld pool. The spray transfer process provides an intensely hot, higher voltage arc and high deposition rates. The pulsed spray mode of metal transfer uses two weld current levels: low background and pulse peak. Droplet transfer usually occurs during the pulse peak portion of the cycle. The low current background allows reduced heat input and improved weld pool control. Flux cored welding transfers metal in a manner similar to spray transfer, but with larger droplets. The higher weld currents usable with flux cored welding result in higher deposition rates and deeper penetration. Self-shielded flux cored welding is similar to gas-shielded flux cored welding except that its weld shielding mechanism is self-contained in the wire. As a result, it can be used outdoors with less need for wind breaks.
- OSTI ID:
- 6274520
- Journal Information:
- Welding Journal (Miami); (United States), Vol. 72:8; ISSN 0043-2296
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM ALLOYS
GAS METAL-ARC WELDING
CARBON STEELS
STAINLESS STEELS
COMPARATIVE EVALUATIONS
ELECTRODES
FILLER METALS
HEAT TRANSFER
INDUCTANCE
MASS TRANSFER
POWER SUPPLIES
SHIELDED METAL-ARC WELDING
SHIELDING
USES
WELDING FLUXES
WELDING MACHINES
ALLOYS
ARC WELDING
ELECTRICAL PROPERTIES
ELECTRONIC EQUIPMENT
ENERGY TRANSFER
EQUIPMENT
EVALUATION
FABRICATION
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
JOINING
PHYSICAL PROPERTIES
STEELS
WELDING
360101* - Metals & Alloys- Preparation & Fabrication