Although flux-cored arc welding may be applied semiautomatically, by machine, or automatically, the process is usually applied semiautomatically. The carbon dioxide gas shield produces a deeply penetrating arc and usually provides better weld than is possible without an external gas shield.
The flux core alone can provide all the shielding gas and slagging materials.Carbon dioxide gas can be used with the flux to provide additional shielding.The closure seam, which appears as a fine line, is the only visible difference between flux-cored wires and solid cold-drawn wire.įlux-cored electrode welding can be done in two ways: The flux-cored welding wire, or electrode, is a hollow tube filled with a mixture of deoxidizers, fluxing agents, metal powders, and ferro-alloys. A diagram of the process is shown in figure 10-55 below. Shielding is obtained by a flux contained within the tubular electrode wire or by the flux and an externally supplied shielding gas. It is an arc welding process in which the heat for welding is provided by an arc between a continuously fed tubular electrode wire and the workpiece. Video: Flux Cored Self Shielded Welding Basicsįlux core welding or tubular electrode welding has evolved from the MIG welding process to improve arc action, metal transfer, weld metal properties, and weld appearance. This variation of the process is used for increasing the productivity of out-of-position welds and for deeper penetration. The flux is designed to support the weld pool for out-of-position welds. The flux in gas-shielded FCAW provides for deoxidation of the weld pool and, to a smaller degree than in self-shielded FCAW, provides secondary shielding from the atmosphere. The fluxing agents in self shielded FCAW are designed to not only deoxidize the weld pool but also to allow for shielding of the weld pool and metal droplets from the atmosphere. Usually, self-shielded FCAW is used in outdoor conditions where wind would blow away a shielding gas. The difference in the two is due to different fluxing agents in the consumables, which provide different benefits to the user. There are two basic process variants self shielded FCAW (without shielding gas) and gas shielded FCAW (with shielding gas). Direct current, electrode positive (DCEP) is commonly employed as in the FCAW process. The flux, which is contained within the core of the tubular electrode, melts during welding and shields the weld pool from the atmosphere. The arc is initiated between the continuous wire electrode and the workpiece.
Flux Core Arc Welding (FCAW) uses a tubular wire that is filled with a flux.
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