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Five percent Ni steel plates were welded by fiber laser after preheating. Preheating temperature was 200 °C, 350 °C, and 450 °C to adjust cooling rate of coarse-grained heat-affected zone (CGHAZ). Thermal simulation was used with Gleeble machine to investigate the microstructure evolution and low-temperature impact toughness of CGHAZ. With the increment of preheating temperature, the microstructure...
For the fatigue design of welded structures under constant amplitude loading, often the nominal stress approach based on design S-N curves is used. The design S-N curves, which can be found in commonly used guidelines, cover arc welds as well as beam welds. However, the experimental data basis for the guideline consists mainly of arc-welded joints. Beam-welded components on the other hand show different...
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