INFLUENCE OF NICKEL-IRON ELECTRODE PROPERTIES AND JOINT SHAPES ON WELDED JOINT STRENGTH OF PEARLITIC NODULAR-IRON

The influence of nickel-iron electrode properties and joint shapes on QT600-3 nodular iron joint strength and cracking was investigated usin g the Moire fringe method. The total displacement of these welded join ts under uniaxial tension was obtained. It was found that the newly de veloped nickel-iron electrode improved the welded joint strength. The experimental results also showed that double-V joint strength was high er than single-V joint strength, whereas single-ii joint strength was lower than single-V joint strength. Single-U joint fracture was in the partially mixed zone of the weld root and parallel to the fusion line . This could be attributed to the complex compositions and structures at the weld root.