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OCR: TABLE ADAPTABILITS OF METALS TO SPOT WELDING Best Good With Difficulty tungsten Nickel to iron Nickel to molybdenum Nickel copper aluminum tantalum tungsten copper Iron to Iron molybdenum constantan tantalum Aluminum to aluminum All other metals are spot with difficulty (except with protectinp atmosphere and thyratron- -controlled current pulse) ADAPTABILITY Aluminun sluminnm welded protecting