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1、铝合金焊接接头产生裂纹特征及产生机理摘要近几十年来，随着科学技术的不断进步，焊接技术也在不断进步，许多高效率和高性能的焊接方法得到了推广。铝及铝合金材料密度低，强度高，热电导率高，耐腐蚀能力强，无磁性，成形性好及低温性能好，具有良好的物理特性和力学性能，因而广泛应用于工业产品的焊接结构上。但国产化的铝合金和铝合金焊接材料均与国外还存在着一定的差距。虽然已经应用铝及其合金焊成许多重要产品，但铝及铝合金由于具有独特的理化性能，因此在焊接过程中会产生一系列的困难，主要的问题有：焊缝中的气孔、焊接热裂纹、接头“等强性”等。本文对铝合
2、金焊接接头产生裂纹的特征及产生机理进行了分析，提出了几点防范措施。关键词：铝合金；焊接接头；裂纹；机理；措施IAbstractInrecentdecades,withtheimprovementofscienceandtechnology,theweldingtechnologyalsocontinuedtomakeprogress,manyhighefficiencyandhighperformanceweldingmethodforpromotion.Aluminumandaluminumalloymateriallow
3、density,highstrength,andthermalconductivityhigh,corrosionresistance,andastrongabilitywithoutmagnetic,formingthegenderisgoodandlowtemperatureperformanceisgood,havegoodphysicalpropertiesandmechanicalproperties,andwidelyusedinindustrialproductsofweldingstructure.Butth
4、ealuminumalloyandaluminumalloylocalizationofweldingmaterialsareabroadandabiggapbetweenthestillexist.Althoughhasbeenusedaluminumalloysweldingintomanyimportantproducts,butaluminumandaluminumalloywiththeiruniquephysicalandchemicalproperties,sotheweldingprocessofwillpr
5、oduceaseriesofdifficulties,themainproblem:theporosity,weldingseamhotcracking,joint"aggressive",etc.Inthispaper,thealuminumalloyweldingjointcrackcharacteristicsandproducemechanismareanalyzed,andputsforwardsomepreventivemeasures.KeyWords:aluminumalloy;Weldingjoint;Cr
6、ack;Mechanism;measuresII目录摘要...................................................................IAbstract..............................................................II1绪论..................................................................11.1引言......................
7、......................................11.2铝合金的概述....................................................11.3铝合金的焊接特点................................................21.4铝合金焊接方法.................................................41.5铝合金材料焊接的工艺方法.............................
8、...........42铝合金焊接接头中的裂纹及其特征.......................................62.1热裂纹的概述...................................................72.2热裂纹产生的过程及机理..
