【正文】 畢業(yè)設(shè)計(jì)（論文）題 目： 熱核聚變堆熱錨TIG釬焊工藝研究 Study on the TIG brazing process of thermonuclear fusion reactor thermal anchor 指導(dǎo)教師： 職稱： 學(xué)生姓名： 學(xué)號(hào)： 專 業(yè)： 材料成型及控制工程 院 （系）： 材料科學(xué)與工程學(xué)院 2012年5月30日 摘 要ITER國際熱核聚變實(shí)驗(yàn)堆，被譽(yù)為地球上的人造太陽。在整個(gè)聚變堆裝置中，磁支撐系統(tǒng)的熱錨冷卻管起著維持系統(tǒng)間溫度平衡的作用，為保持熱錨冷卻管的低變形率和低泄漏率 ，電弧釬焊連接方法是一種較為理想的連接方法。與傳統(tǒng)熔化焊相比，電弧釬焊近年來作為高效節(jié)能的釬焊技術(shù)，具有熱輸入低、對(duì)木材組織性能影響小、節(jié)能環(huán)保、焊接效率高、易實(shí)現(xiàn)機(jī)械化和自動(dòng)化，并且能克服ITER熱錨熔化焊時(shí)產(chǎn)生熱裂紋、氮?dú)饪?、母材性能降低等，同時(shí)還能避免熱錨冷卻管焊穿破壞以及冷卻管和韌性板變形嚴(yán)重等問題。為保證ITER熱錨焊接質(zhì)量，本文采用TIG電弧釬焊工藝連接熱錨，通過接頭宏觀形貌觀察、金相微觀組織觀察、及顯微硬度測(cè)試，研究了焊接角度、位置和釬劑使用對(duì)ITER熱錨接頭質(zhì)量的影響，分析了接頭的組織與性能進(jìn)行了分析。研究結(jié)果表明，TIG電弧釬焊，焊接角度、位置以及釬劑使用對(duì)ITER熱錨接頭質(zhì)量影響顯著。不使用釬劑，改變焊接角度和位置，接頭存在較寬界面區(qū)，接頭為熔焊特征；選擇合適焊接角度和位置，并輔助使用釬劑，可以獲得局部溶蝕，局部為釬焊界面的熔釬焊接頭，具有熔焊和釬焊雙重特征，接頭質(zhì)量較好。接頭界面區(qū)是銅基釬料與不銹鋼基材組元發(fā)生突變的區(qū)域，釬料組元向界面區(qū)擴(kuò)散，界面區(qū)組織為Fe基體和顆粒狀Cu基固溶體；不銹鋼基材熔蝕及組元向焊縫擴(kuò)散，焊縫組織由αCu基體和顆粒狀Fe基固溶體組成，固溶體的存在強(qiáng)化了界面區(qū)和焊縫性能。焊縫與基材間界面區(qū)顯微硬度發(fā)生突變，熱錨熔釬焊接頭熔焊特征處，界面區(qū)寬大，顯微硬度值變化平緩，界面區(qū)、基材以及焊縫的平均顯微硬度分別為412HV20；接頭釬焊特征處，界面區(qū)較窄，顯微硬度在較小范圍內(nèi)發(fā)生突變，界面區(qū)、較窄界面區(qū)處固溶了更多釬料組元，顯微硬度值更大。關(guān)鍵詞：ITER；熱錨冷卻管；電弧釬焊；焊接工藝AbstractITER International Thermonuclear Experimental Reactor, known as the artificial sun on Earth. In the fusion reactor device, the cooling tube of the magnetic support thermal anchor plays to maintain the system temperature balance between the role of arc brazing is an ideal in order to maintain the low deformation rates and low leakage rate of the cooling pipe of the hot anchor connection method. Compared with traditional fusion welding, arc brazing brazing technology in recent years as energy efficient, with low heat input, the impact on the Timber Organization performance, energy saving, high welding efficiency, easy mechanization and automation, and can overe the ITER heat anchor fusion welding, hot cracking, nitrogen hole, the base metal performance, while avoiding thermal anchor cooling pipe welding wear destruction and the cooling pipe and toughness board order to ensure the welding quality of ITER thermal anchor, using the TIG arc brazing process to connect the thermal anchor, through the joint macromorphology, microstructure, microstructure observations, and microhardness testing, welding angle, position and flux on the ITER thermal anchor joint quality impact analysis of the organization and performance of the joints were results show that, of TIG arc brazing, welding angle, position, and flux of ITER thermal anchor connector significantly impacting on quality. Flux to change the welding angle and position, the joint existence of a broad interface area, the joint welding characteristics。 select the appropriate welding angle and position, and supporting the use of flux, you can get local dissolution, local interface of melting solder for brazing welding head, with the dual characteristics of the welding and brazing joints of good quality. Connector interface area is a copperbased brazing stainless steel substrate element mutation in the region, brazing group diffusion to the interfacial region, the interface zone of the Fe matrix, and granular Cubased solid solution。 stainless steel substrate corroded elements to diffusion weld, the weld metal by the αCu matrix and granular Febased solid solution, the existence of solid solution strengthening of the interface zone and weld with a mutation in the interface region between the substrate microhardness, thermal anchor molten braze welding head and welding characteristics at the interface region spacious microhardness changes smoothly between the interfacial region, the substrate and welds average microhardness for 412HV20 209HV20 and 。 joints brazing characteristics at the in