The Effect of Ultrasonic Vibration on Mechanical Properties of Welding Between New 25Cr-35Ni and Aged 25Cr-35Ni.
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Abstract
Welding repair of heat resistant steels has sometimes involved in joining of new materials and in-service materials which might be degraded from its long high temperature service. Ultrasonic vibration applied to weld metal during welding has been known that it can help improve mechanical properties of certain type of weld metal. However, most of the studies focused on welding of new materials. The objective of this work is to study the effect of ultrasonic vibration on mechanical properties of welding between new 25Cr-35Ni and aged 25Cr-35Ni heat resistant steel. Gas Tungsten Arc Welding (GTAW) with matching filler metal (25Cr-35Ni) was used in this study. Ultrasonic vibration with a frequency of 20 kHz was applied to the samples during welding pool solidification. Tensile strength, micro hardness, and microstructure analysis of weld with and without assisting ultrasonic vibration were compared. The results showed that ultrasonic vibration applied during solidification promoted grain refinement but mechanical properties of weld with assisting ultrasonic vibration could not be improved due to redistribution of rounded chromium carbide precipitation in weld metal.
Article Details
บทความ ข้อมูล เนื้อหา รูปภาพ ฯลฯ ที่ได้รับการตีพิมพ์ในวารสารฯ ถือเป็นลิขสิทธิ์ของวารสารฯ หากบุคคลหรือหน่วยงานใดต้องการนำทั้งหมดหรือส่วนหนึ่งส่วนใดไปเผยแพร่ต่อหรือเพื่อกระทำการใดๆ จะได้รับอนุญาต แต่ห้ามนำไปใช้เพื่่อประโยชน์ทางธุรกิจ และห้ามดัดแปลง
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