Welding thermal cycle parameters have a significant effect on the structure of HAZ
and then determine the mechanical properties of welds.The effect of wall thickness on the welding thermal cycle parameters of X80 pipeline steel was studied by numerical simulation.The results show that the increase of wall thickness has a significant effect on cooling time t8/5
high temperature residence time tH and peak temperature.When wall thickness increases from 8 mm to 16 mm
the cooling rate in coarse grain zone increases to 4.4 times and high temperature residence time decreases by 9.1 s.The peak temperature decreases by 182℃.Increasing the heat input will prolong the high temperature residence time tH and increase the peak temperature
but the improvement of cooling time t8/5 is not obvious.Preheating before welding can increase the high temperature residence time and peak temperature
and greatly reduce the cooling speed of coarse grain zone.When the preheating temperature reaches 200℃
the cooling time t8/5 of coarse grain zone increases to 2.9 times of the original.The results obtained have guiding significance for predicting the structure composition and weld properties of heat affected zone of pipeline steel.
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references
刘成,尹立孟,姚宗湘,等.焊缝余高对复合型坡口X80管线钢多层多道焊接残余应力的影响[J].焊接学报,2018,39(12):100-104+133.LIU C,YIN L M,YAO Z X,et al.Effect of reinforcement on residua stress of multi-layer and multi-pass welding of composite groove X80 pipeline steel[J].Transactions of The China Welding Institution.2018,39(12):100-104+133.(in Chinese)
张德芬,王进,景亮,等.热输入对X80管线钢焊接粗晶区组织与性能的影响[J].金属热处理,2014,39(2):47-50.ZHANG D F,WANG J,JING L,et al.Influence of heat input on microstructure and properties of welding coarse-grained zone of X80 pipeline steel[J].Heat Treatment of Metals,2014,39(2):47-50.(in Chinese)
胥国祥,杜宝帅,董再胜,等.厚板多层多道焊温度场的有限元分析[J].焊接学报,2013,34(5):87-90+117.XU G X,DU B S,DONG Z S,et al.Finite element anlysis of temperature field in multi-pass welding of thick steel plate[J].Transactions of The China Welding Institution,2013,34(5):87-90+117.(in Chinese)
NAZMUL H,ABDELBASET R H M,JAMES G,et al.Influence of martensite-austenite(MA)on impact toughness of X80 line pipe steels[J].Materials Science&Engineering A,2016,26:481-491.
石庭深,朱加雷,焦向东,等.X80管线钢激光电弧复合焊接数值分析[J].电焊机,2016,46(2):78-81.SHI T S,ZHU J L,JIAO X D,et al.Numerical analysis of X80 pipeline steel in laser-arc hybrid welding[J].Electric Welding Machine,2016,46(2):78-81.(in Chinese)
张文钺.焊接传热学[M].北京:机械工业出版社,1989.ZHANG W Y.Welding heat trasfer[M].Beijing:China Machine Press,1989.
GOLDAK J,CHAKRAVARTI A,BIBBY M.A new finite element model for welding heat sources[J].Metallurgical and Materials Transactions B,1984,15(2):299-305.
EDUARDO J F R,TIAGO D S A,PABLO B G,et al.Modeling of the temperature field generated by the deposition of weld bead on a steel butt joint by FEM techniques and thermographic images[J].Materials Research,2018,21(3):1-7.
CARMO D A D,FARIA A R D.A 2D finite element with through the thickness parabolic temperature distribution for heat transfer simulations including welding[J].Finite Elements in Analysis&Design,2015,93(93):85-95.
NIMA Y,DEZHPARVAR D E,RADOVAN K,et al.Numerical prediction and experimental analysis of the residual stress fields and generated distortion in hybrid laser/arc welded thick plates of high-strength steels[J].The International Journal of Advanced Manufacturing Technology,2018,98(9-12):2725-2735.
何雄君,何江源.对流换热系数对厚板焊接残余应力应变研究[J].重庆交通大学学报(自然科学版),2017,36(11):7-10+15.HE X J.HE J Y.Residual Stress and Strain of Convective Heat Transfer Coefficient on Thick Plate Welding[J].Journal of Chongqing Jiaotong University(Social Sciences Edition),2017,36(11):7-10+15.(in Chinese)
[121 CHEN B Q,HASHEMZADEH M,GUEDES SOARES C.Numerical and experimental studies on temperature and distortion patterns in butt-welded plates[J].The International Journal of Advanced Manufacturing Technology,2014,72(5-8):1121-1131.
尹长华,杨武堂.-20℃低温环境下大口径X80钢管的焊接[J]焊接技术,2009,38(5):19-23.YIN C H,YANG W T.Welding of the big diameter X80 pipe in low temperature environment of-20℃[J].Welding Technology,2009,38(5):19-23.(in Chinese)
薛小怀,周昀,钱百年,等.X80管线钢焊接粗晶区组织与韧性的研究[J].上海交通大学学报,2003,37(12):1854-1857.XUE X H,ZHOU Y,QIAN B N,et al.Coarse Grain Heat Affect Zone Microstructures and Toughness of X80 Pipeline Steel[J].Journal of Shanghai Jiaotong University,2003,37(12):1854-1857.(in Chinese)
陈玉喜,刘亮,张华军,等.焊接热输入对低合金高强钢焊缝组织和韧性的影响[J].上海交通大学学报,2015,49(3):306-309+314.CHEN Y X,LIU L,ZHANG H J,et al.Effect of Heat Input on Microstructure and Toughness of Weld Joint of High-Strength Low Alloy Steel[J].Shanghai Jiaotong Univ,2015,49(3):306-309+314.(in Chinese)