Abstract
The fatigue threshold and high growth rate region properties of conventional welded joints were improved by using newly developed low transformation temperature welding wire. The developed weld metal which contains 10 wt% nickel and 10 wt% chromium begins to transform from austenite to martensite at about 180°C and finishes it at room temperature. During the transformation the weld metal expands. This expansion induces a compressive residual stress around the welded part. The stress ratio effect due to this compressive residual stress makes the fatigue crack growth properties of the developed weld metal superior by intensifying the fatigue crack closure.
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