Partially Melted Zone in Aluminum Welds

铝焊缝中的部分熔化区

• 批准号: 9803589
• 负责人: Sindo Kou
• 金额: $ 28.61万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-07-01 至 2002-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9803589&HistoricalAwards=false
• 关键词: Partially; Melted; Zone; Aluminum; Welds

9803589 Kou The object of this program is to better understand the formation, structure and properties of the partially melted zone formed during gas metal arc welding of aluminum alloys. Gas metal arc welds are made on an aluminum-4.5% copper alloy to examine the grain boundary structure and determine the temperature gradient and growth rate. Solute and hardness distributions are determined across grain boundaries by scanning transmission electron microscopy and nano indentation. Thermal effects are explored using pulsed gas metal arc welding to determine effect on grain boundary liquation. Benefits are expected based on the lower heat input produced by the pulsing process. Gleeble simulation of the weld structure provides controlled, known thermal cycles and nearly one dimensional heat flow to samples undergoing grain solidification. %%% Gas metal arc welding is the most widely used process for welding aluminum alloys. The research has application to the welding of aluminum structures, such as an all-aluminum automobile body, one direction pursued to reduce the weight of future automobiles. ***

小行星9803589 该程序的目的是更好地了解铝合金气体保护焊过程中形成的部分熔化区的形成、结构和性能。 在铝-4.5%铜合金上进行气体保护电弧焊，以检查晶界结构并确定温度梯度和生长速率。 通过扫描透射电子显微镜和纳米压痕法测定了晶界上的溶质和硬度分布。 采用脉冲熔化极气体保护焊研究了热效应对晶界液化的影响。 基于由脉冲过程产生的较低的热输入，预期益处。 焊接结构的Gleeble模拟为经历晶粒凝固的样品提供受控的已知热循环和近一维热流。 熔化极气体保护焊是焊接铝合金最广泛使用的工艺。 该研究可应用于铝结构的焊接，例如全铝车身，这是未来汽车减轻重量的一个方向。 ***