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Two 8 mm thick steel places are placed 5 mm apart and welded by a butt joint. Welding is carried out at 0 V and speed of 5 mm/sec. heat transfer efficiency is 0.80. if the heat required to melt steel is 10 J/mm3 and melting efficiency is 0.625. the weld current (in Amperes) will be

(a) 100                                   (b) 200

(c) 300                                   (d) 400

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