Fatigue properties of weld joint of steel sheets treated by PLASOX process

Rad se bavi svojstvima zamora zavarenih spojeva tankih čeličnih limova DC01 kao i svojstvima zamora zavarenih spojeva čeličnih limova DC01 obrađenih PLASOX postupkom, kojeg je patentiralo poduzeće RÜBIG. Svojstva zamora tih čeličnih ploča dosljedno su konfrontirana svojstvima zamora tih materijala bez zavara. Čelični limovi su zavareni laserskim vlaknom TruFiber 400. Probe na zamor materijala provedene su pod opterećenjem zbog savijanja s frekvencijom od 20 kHz na ultrazvučnom stroju KAUP-ZU. Na puknutim površinama provedena je fraktografska analiza kako bi se odredio mehanizam loma. Rezultati su dokazali da je plazma nitrooksidacija postupka PLASOX pozitivno djelovala na vijek trajanja do zamora zavarenih spojeva.The paper deals with the fatigue properties of weld joints of thin steel sheets DC01 as well as the fatigue properties of weld joints of steel sheets DC01 treated by the PLASOX process, which is patented by RÜBIG company. Fatigue properties of these steel sheets were consequently confronted with the fatigue properties of these materials without weld. Steel sheets were welded by fibre laser TruFiber 400. Fatigue life tests were carried out under bending load with frequency of 20 kHz on ultrasonic fatigue machine KAUP-ZU. On the fractured surfaces the fractographic analysis was carried out to determine the mechanism of rupture. The results proved that plasma nitrooxidation by PLASOX process had a positive effect on fatigue life of weld joints