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Autogeneous gas tungsten arc welding of a steel plate is carried out with welding current of 500A, voltage of 20V, and weld speed of 20mm/min. Consider the heat transfer efficiency from the arc to the weld pool as 90%. The heat input per unit length (in kJ/mm) is

(a) 27                          (b) 35

(c) 45                          (d) 55

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