- 摘 要
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(1 北京建工集團(tuán)有限責(zé)任公司, 北京 100055; 2 河北省土木工程災(zāi)變控制與災(zāi)害應(yīng)急重點(diǎn)實(shí)驗(yàn)室, 廊坊 065201; 3 華北科技學(xué)院建筑工程學(xué)院, 廊坊 065201)
摘要: 針對北京工人體育場改造復(fù)建冬季現(xiàn)場低溫環(huán)境下高強(qiáng)厚板復(fù)雜鋼結(jié)構(gòu)焊接作業(yè)難度大的問題,開展了-15℃低溫環(huán)境 Q460GJC 厚板焊接接頭溫度場、顯微組織、力學(xué)性能模擬和工藝試驗(yàn)研究. 結(jié)果表明:預(yù)熱溫度為170℃時(shí),焊接開始時(shí),V 形坡口斜面端溫度比直端低,實(shí)測溫度前三層焊接后溫度比預(yù)熱溫度低,第 6 層焊接后溫度趨于一致,略高于預(yù)熱溫度,實(shí)際溫度比模擬溫度略低 20℃左右,均小于 225℃ 的要求值;模擬焊接后,焊縫處的組織主要由鐵素體、珠光體和貝氏體組成,鐵素體占 50%左右;通過顯微組織觀察,焊縫區(qū)主要是鐵素體與珠光體,表層區(qū)主要是鐵素體與球狀珠光體,中心層區(qū)出現(xiàn)了板條狀珠光體,熱影響區(qū)組織為鐵素體+貝氏體;顯微硬度范圍 188~ 275HV,焊縫極限強(qiáng)度值在 640MPa 左右;通過對比模擬結(jié)果與實(shí)測結(jié)果,基于焊接熱模擬及焊接冶金基礎(chǔ)理論可有效實(shí)現(xiàn)高強(qiáng)鋼厚板焊接組織性能預(yù)測分析.
關(guān)鍵詞: 北京工人體育場; 改造復(fù)建; 高強(qiáng)度鋼; 低溫焊接; 焊接模擬仿真
中圖分類號:TU511. 3 文獻(xiàn)標(biāo)志碼:A 文章編號:1002-848X(2023)06-0031-09
DOI:10. 19701 / j. jzjg. ZJ220110
Simulation and experimental study on low temperature welding of high strength thick plate steel in Beijing Workers Stadium
LI Xin1, WANG Meng1, ZHUANG Baotong2,3, XU Wenhan1
(1 Beijing Construction Engineering Group Co. , Ltd. , Beijing 100055, China; 2 Hebei Key Laboratory of CivilEngineering Catastrophe Control and Disaster Emergency Response, Langfang 065201, China; 3 ArchitecturalEngineering College, North China Institute of Science and Technology, Langfang 065201, China)
Abstract: In order to solve the problem of difficult welding operation of complex steel structure of high strength thick plateunder low temperature environment in the reconstruction of Beijing Workers Stadium in winter, the temperature field,microstructure, mechanical properties simulation and process test of welded joint of Q460GJC thick plate in - 15℃ lowtemperature environment were carried out. Results show that when the preheating temperature is 170℃ , the temperature ofV groove welding bevel end is lower than the straight side at the beginning. The measured temperature of the first threelayer after welding is lower than the preheating temperature while the temperature after the sixth layer tends to be same andis slightly higher than the preheating temperature. The actual temperature are all lower than the required value of 225℃ andabout 20℃ lower than the simulated temperature. After simulated welding, the microstructure of the weld joint is mainlycomposed of ferrite, pearlite and bainite, with ferrite accounting for about 50%. According to the microstructureobservation, the microstructure of weld zone is mainly ferrite and pearlite, the surface zone is mainly ferrite and sphericalpearlite, the central layer of the plate is lamellar pearlite, the heat affected zone is ferrite+bainite. The microhardnessrange is 188~ 275HV, and the ultimate strength of the weld joint is about 640MPa. By comparing the the measured resultswith simulation results, the prediction analysis of welding microstructure and properties of high strength thick steel plate canbe effectively realized based on welding thermal simulation and basic theory of welding metallurgy.
Keywords:Beijing Workers Stadium; rehabilitation and reconstruction; high strength steel; low temperature welding;welding simulation
第一作者:李欣,碩士,高級工程師,主要從事大型公建項(xiàng)目建造及施工研究,Email:1710941523@ qq. com.
[引用本文] 李欣,王猛,莊寶潼,等. 北京工人體育場高強(qiáng)度厚板鋼低溫焊接仿真與試驗(yàn)研究[ J]. 建筑結(jié)構(gòu),2023,53( 6): 31-39, 82. LI Xin, WANG Meng, ZHUANG Baotong, et al. Simulation and experimental study on lowtemperature welding of high strength thick plate steel in Beijing Workers Stadium[J]. Building Structure,2023,53(6):31-39,82.
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