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FU Yuming, ZHAO Huayang, DU Wenlian, LI Yanfang, ZHENG Lijuan. Fatigue life and strengthening research of welded joints with hole defects by using electromagnetic heating[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2017, 38(4): 31-34. DOI: 10.12073/j.hjxb.20170407
Citation: FU Yuming, ZHAO Huayang, DU Wenlian, LI Yanfang, ZHENG Lijuan. Fatigue life and strengthening research of welded joints with hole defects by using electromagnetic heating[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2017, 38(4): 31-34. DOI: 10.12073/j.hjxb.20170407
shu

Fatigue life and strengthening research of welded joints with hole defects by using electromagnetic heating

  • 1.

    Mechanical Engineering College, Yanshan University, Qinhuangdao 066004, China

  • 2.

    Mechanical Engineering College, Yanshan University, Qinhuangdao 066004, China;Mechanical Engineering College, Inner Mongolia University for the Nationalities, Inner Mongolia 028043, China

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  • Received Date: April 10, 2015
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    • Abstract
  • Aiming at the hole defects in the welded joints, by the ZL-2 super pulse discharge generator, the welded joints of 9CrSi steel with hole defects were discharged by electromagnetic heating and the fatigue life were tested before and after discharge by using self-designed fatigue testing machine. The discharging instant stress intensity factors were theoretically calculated. The result shows that there is an optimal discharge voltage for the fatigue life. Under the action of 5.5 kv pulse discharge voltage, the average fatigue life of welded joints after discharge are increased by 10%. The electrothermal stress intensity factor is negative that weaken the crack driving force, thereby extending the fatigue life of the welded joints.
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    • References (11)
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