本文關(guān)鍵詞：活性劑輔助激光焊接組織性能研究　出處：《哈爾濱理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 活性劑 激光焊接 焊縫成形 不銹鋼

【摘要】：活性劑輔助TIG焊(A-TIG焊)自2000年在我國開始研究和開發(fā)以來，已經(jīng)在不銹鋼、鈦合金等材料上得到了應(yīng)用。使用活性劑后焊縫熔深得到提高，焊縫成形得到改善，并且提高了生產(chǎn)效率。激光焊接在國內(nèi)外越來越得到廣泛的重視，其焊接速度快，熱影響區(qū)小，焊縫性能好。但受制于激光功率和成本的限制，如果需要焊接相對厚板，需要大的激光功率，這就意味著高成本的投入。 本論文以不銹鋼為研究對象，采用激光焊接方法，研究單一和混合活性劑對激光焊縫熔深、組織性能的影響規(guī)律，并通過高速攝像手段分析在活性劑應(yīng)用前后激光焊接等離子體的形態(tài)的變化規(guī)律。通過半導(dǎo)體活性激光焊接試驗和活性光纖激光焊接試驗，對不同波長激光和活性劑作用進(jìn)行了分析和論述。 針對304奧氏體不銹鋼采用對接和堆焊的激光活性焊接，通過進(jìn)行金相顯微分析、能譜EDS分析等方法，研究涂覆活性劑前后304奧氏體不銹鋼焊縫熔深、深寬比、微觀組織、焊縫化學(xué)成分的影響規(guī)律。結(jié)果表明，無論是半導(dǎo)體激光焊還是光纖激光焊，微觀組織成分并沒有改變，均為奧氏體枝晶。使用活性劑的焊縫組織中的柱狀晶的生長方向與焊縫熔合線方向相互垂直，焊縫中心存在一部分等軸晶�；钚詣┰诩す夂附又惺怯幸欢ㄗ饔玫�，，四種活性劑的使用增加了熔深，其中SiO2活性劑、Cr2O3活性劑和混合活性劑分別使熔深增加50%、59%、75%，TiO2增加熔深不明顯。在熔寬的變化方面，Cr2O3使得熔寬增加了3%，而涂敷其它三種活性劑的焊縫熔寬都減小了，復(fù)合活性劑的熔寬減少的最明顯，減少了11%。
[Abstract]:Activity-assisted TIG welding (A-TIG welding) has been in stainless steel since its research and development began in China in 2000. Titanium alloy and other materials have been applied. With the use of active agent, weld penetration is improved, weld formation is improved, and production efficiency is improved. Laser welding has been paid more and more attention at home and abroad. The welding speed is fast, the heat affected zone is small, and the weld performance is good, but it is limited by the laser power and cost. If it needs to weld the relative thick plate, it needs large laser power, which means the high cost investment. In this paper, stainless steel is taken as the research object, and the influence of single and mixed active agent on the penetration depth, microstructure and properties of laser weld is studied by laser welding method. The changes of plasma morphology of laser welding before and after the application of active agent were analyzed by high speed camera. The experiments of semiconductor active laser welding and active fiber laser welding were carried out. The interaction of different wavelengths of laser and active agent was analyzed and discussed. In view of 304 austenitic stainless steel, laser active welding of butt and surfacing welding was adopted. Metallographic microanalysis, energy spectrum EDS analysis and so on were carried out. The effects of active agent on the weld penetration depth, aspect ratio, microstructure and chemical composition of 304 austenitic stainless steel were studied. The results showed that both semiconductor laser welding and fiber laser welding were used to weld 304 austenitic stainless steel. The microstructure of the weld is not changed, all of them are austenitic dendrites. The growth direction of columnar crystal in the weld with active agent is perpendicular to the direction of weld fusion line. There is a part of equiaxed crystal in the center of weld seam. The active agent has certain function in laser welding, and the use of four kinds of active agent increases the penetration depth, among which SiO2 active agent. The Cr2O3 active agent and the mixed active agent increase the penetration by 50%, respectively. The melting width is increased by 3% when Cr _ 2O _ 3 is used in the variation of the melting width. However, the weld width of the other three kinds of active agents was decreased, and that of the composite active agent was decreased by 11.1%.
【學(xué)位授予單位】：哈爾濱理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG456.7

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本文編號：1406039