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Abstract: A new low transformation temperature electrode-(LTTE) is
developed based on the volume expansion principle that weld metal begins
to transform from austenite to martensite at round 191 °C and finishes
about room temperature. The weld metal of LTTE can obtain compressive
residual stresses by phase stress at usual cool speed. These may enhance
the fatigue strength of welded joints. The fatigue specimens of five
kinds of the typical welded joints welded by LTTE and E5015 electrode
are selected to conduct fatigue test. It is shown that the former
fatigue strength is improved respectively from 11% to 58% than the
latter at 2×106 cycles. It is also shown that the higher the stress
concentration and restraint intensity of weld joints are, the higher
their effect of improving fatigue strength are.
Key words: Phase stress Welded joints Fatigue strength
Compressive residual stress
CLC No: TG404
国家自然科学基金资助项目(50175079).
Received 20011122, received in revised form 20020311
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