Advanced Search
WANG Jian-hua, LU Hao, Hidekazu Murakawa. A Direct Assessing Method of Heated Widths During Local PWHT[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2000, (2): 39-42.
Citation: WANG Jian-hua, LU Hao, Hidekazu Murakawa. A Direct Assessing Method of Heated Widths During Local PWHT[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2000, (2): 39-42.

A Direct Assessing Method of Heated Widths During Local PWHT

More Information
  • Received Date: January 11, 1999
  • Local postweld heat treatment (local PWHT) is usually performed for tempering and relaxation of residual stresses. Many factors have an influence on PWHT procedures and the heated width is the most important parameter controlling the effectiveness of local PWHT. However,the determination rules of this parameter are very different in the different codes. In this study,a direct method to assess the effectiveness of local PWHT was used based on the thermal-visco-elastic-plastic FEM with the consideration of creep phenomena. This method clearly shows the whole history of stress relief during PWHT and a critical heated width can be obtained. The pipe with original welding residual stresses is analyzed under different conditions of PWHT. Investigations show that the maximum residual stress after PWHT decreases when the heated width increases. When the heated width becomes large enough,the residual stress after PWHT changes very slowly and a critical heated width can be found which gives a residual stress close to the value obtained from th uniform PWHT. A series of different PWHT conditions are studied to find the critical heated width by using this method. It is found that a heated area of 5 √rq centered on weld seems resonable from the view of stress relief.
  • Related Articles

    [1]ZHANG Yuelai, PENG Zhangzhu, CHANG Maochun, HU Long, PAN Guochang, XU Bo. Numerical simulation of residual stress in complex aluminum alloy welded structure[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2021, 42(3): 91-96. DOI: 10.12073/j.hjxb.20201215001
    [2]ZENG Qingji, XU Lianyong, HAN Yongdian, JING Hongyang, ZHOU Chunliang. Finite element numerical simulation of electron beam welding of TC4 titanium alloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2014, 35(11): 109-112.
    [3]LUO Yi, LIU Jinhe, YE Hong. Numerical simulation on keyhole thermal effect of vacuum electron beam welding of magnesium alloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2010, (12): 73-76.
    [4]LUO Yi, LIU Jinhe, YE Hong, YAN Zhonglin, SHEN Bin. Numerical simulation on temperature field of electron beam welding of AZ61 magnesium alloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2009, (3): 73-76.
    [5]ZHANG Guangjun, ZHAO Linlin, LENG Xuesong. Numerical simulation on weld formation of twin-electrode GTAW welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2008, (8): 29-31.
    [6]WANG Qing, ZHANG Yanhua. Numerical simulation on electron beam welding temperature field of heat-resisting superalloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2007, (6): 97-100.
    [7]WANG Jianmin, ZHU Xi, LIU Runquan. Three dimensional numerical simulation for explosive welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2007, (5): 109-112.
    [8]HU Meijuan, LIU Jinhe. Numerical analysis of electron beam welding and local heat treatment combination technology[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2007, (5): 93-96.
    [9]WANG Xi-chang, WU Bing, ZUO Cong-jin, LIU Fang-jun. New heat source model for numerical simulation of electron beam welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2005, (12): 81-84.
    [10]WU Yan-gao, LI Wu-shen, ZOU Hong-jun, FENG Ling-zhi. State-of-the-art of Numerical Simulation In Welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2002, (3): 89-92.

Catalog

    Article views (394) PDF downloads (109) Cited by()

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return