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Welding for Construction Machinery Here with are articles related to welding processes and structural design as aplicable for structures of construction machinery and equipment. |
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Wednesday, May 25, 2005
The Welding Arc
A welding arc is formed when a fairly high current (10 to 2000 A) is forced to flow across a gap between two electrodes at relatively low voltage (10 to 50 V). A welding arc is intensely hot with temperatures exceeding 30000°C and forms a concentrated heat source suitable for melting most metals rapidly. The intense heat of the welding arc causes the filler metal to melt and when added to the locally hot melted workpiece, it forms the weld fusion zone. Its subsequent freezing (solidification) produces the bond (weld) between the workpieces. Arc we~ng processes do not require application of pressure to cause fusion.
