Introduction of carbon arc welding
Carbon Arc Welding (CAW) is a welding process, in which heat is generated by an electric arc struck between an carbon electrode and the work piece. CARBON ARC WELDING (CAW) utilizes what is considered to be a non-consumable electrode, made of carbon or graphite, to establish an arc between itself and either the workpiece or another carbon electrode. The arc heats and melts the work pieces edges, forming a joint.
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ARRANGEMENTS FOR CARBON ARC WELDING:
- CARBON ARC WELDING (CAW) utilizes what is considered to be a nonconsumable electrode, made of carbon or graphite, to establish an arc between itself and either the workpiece or another carbon electrode.
- However, this electrode erodes fairly quickly and generates carbon monoxide (CO) gas that partially replaces the air around the arc, thereby providing the molten weld with some protection.
- The CAW process, which uses either single or twin electrodes, most closely resembles gas-tungsten arc welding (GTAW), where the arc is used only as a source of heat.
- The single-electrode arrangement usually operates with direct current (dc), electrode negative (straight polarity), using most dc power supplies.
- The twin-electrode arrangement usually operates with alternating current (ac), generally with small ac power supplies.
TYPICAL ARRANGEMENTS FOR SINGLE-ELECTRODE AND TWIN-ELECTRODE CARBON ARC WELDING
Although the CAW process has been almost completely replaced by the newer processes used in the welding industry, it is still used in certain applications. The process does produce adequate welds in thin-sheet steel, but should be used with caution in any critical application because it provides only limited shielding from the atmosphere
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