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一台用于焊接井管骨架的晶闸管滚焊机(主电路如附图所示)不能焊接。观察电流表,指示值达50A以上,而正常工作电流
A thyristor seam welder (main circuit as shown in the attached drawings) for welding well tube skeleton can not be welded. Watch the ammeter, indicating the value of more than 50A, while the normal operating current