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Electroslag Welding

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Electroslag Welding

Electroslag Welding
Electroslag Welding is a welding process, in which the heat is generated by an electric current passing between the consumable electrode (filler metal) and the work piece through a molten slag covering the weld surface. Prior to welding the gap between the two work pieces is filled with a welding flux. Electroslag Welding is initiated by an arc between the electrode and the work piece (or starting plate). Heat, generated by the arc, melts the fluxing powder and forms molten slag. The slag, having low electric conductivity, is maintained in liquid state due to heat produced by the electric current.

Electroslag welding (ESW) is a highly productive, single pass welding process for thick (greater than 50 mm) materials in a vertical or close to vertical position. An electric arc is initially struck by wire that is fed into the desired weld location and then flux is added The slag reaches a temperature of about 3500°F (1930°C). This temperature is sufficient for melting the consumable electrode and work piece edges. Metal droplets fall to the weld pool and join the work pieces. Electroslag Welding is used mainly for steels.

Electroslag Welding equipments

Power source Wire feeder Electrode guide tube Retaining Blocks Welding head and Controls

Power source

100 % duty cycle AC and DC (EP) power source 10,000 Amp OCV 60V (range is 30 V to 100 V) Remote controled

Wire feeder

Feed roller Drive motor Provide oscillation rack and pinion motion cam and crank arrangement

Electrode guide tube

Non – consumable insulated beryllium and cermet (non conducting) Consumable compatible to base metal and electrode

Retaining Blocks

Maintain the slag and molten metal with in the cavity Solid copper and water cooled copper shoe Travel upward as welding progress For low melting point graphite or steel can be…...

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