Problem NO: 4

A GTAW operation is performed on low carbon steel, whose unit melting energy is 10.3 J/mm3.\nThe welding voltage is 22 volts and the current is 135 amp

A GTAW operation is performed on low carbon steel, whose unit melting energy is 10.3 J/mm3.

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The welding voltage is 22 volts and the current is 135 amps. The heat transfer factor is 0.7 and the

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melting factor is 0.65. If filler metal wire of 3.5 mm diameter is added to the operation, the final

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weld bead is composed of 60% volume of filler and 40% volume base metal. If the travel speed in

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the operation is 5 mm/sec, determine (a) cross-sectional area of the weld bead, and (b) the feed rate

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(mm/sec) at which the filler wire must be supplied.

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