SGER: Friction Bit Joining - A New Solid State Spot Joining Process

SGER：摩擦钻头连接 - 一种新的固态点连接工艺

• 批准号: 0834729
• 负责人: Michael Miles
• 金额: --
• 依托单位: Brigham Young University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-08-01 至 2009-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0834729&HistoricalAwards=false
• 关键词: SGER; Friction; Bit; Joining; New

The objective of this Small Grant for Exploratory Research (SGER) project is to study the capability of a new solid state joining process, termed friction bit joining, to weld dissimilar combinations of aluminum, magnesium and steel automotive sheets. The automotive industry and the US Government are aggressively pursuing use of lightweight materials such as Mg alloys and Al alloys in auto body structures for improved vehicle fuel efficiency. High-volume production vehicles would require use of a variety of engineering materials, ranging from ultra high-strength steels (UHSS), Al alloys, Mg alloys and others to meet cost and performance objectives. The combination of lightweight materials with widely acceptable structural materials such as UHSS presents a number of technical challenges in automotive body-in-white assembly. One of them is joining different materials to form an integrated structure component which meets design and performance requirements. The current work will study the welding process from a fundamental viewpoint, including the effect of process conditions on metallurgical bond properties of dissimilar alloy joints. The friction bit joining process has been shown to be capable of achieving high levels of strength in dissimilar alloy joints of DP 980 steel and 5754 aluminum alloys during a preliminary study. This combination of ultra high strength steel and a soft aluminum alloy would be difficult or impossible to join using conventional spot welding or even self piercing riveting.If this new process is shown to be successful in bonding dissimilar metal alloys where strength levels are very different, it will promote greater use of light metals in automotive and other transportation structures, allowing for reduced weight and improved fuel efficiency.

该小额探索性研究资助 (SGER) 项目的目标是研究一种新的固态连接工艺（称为摩擦钻头连接）焊接铝、镁和钢汽车板的不同组合的能力。 汽车行业和美国政府正在积极寻求在车身结构中使用镁合金和铝合金等轻质材料，以提高车辆燃油效率。大批量生产的车辆需要使用各种工程材料，包括超高强度钢 (UHSS)、铝合金、镁合金等，以满足成本和性能目标。轻质材料与广泛接受的结构材料（例如 UHSS）的结合给汽车白车身装配带来了许多技术挑战。其中之一是将不同材料连接起来形成满足设计和性能要求的集成结构部件。 目前的工作将从基本角度研究焊接工艺，包括工艺条件对异种合金接头冶金结合性能的影响。 初步研究表明，摩擦钻头接合工艺能够在 DP 980 钢和 5754 铝合金的异种合金接头中实现高强度水平。 这种超高强度钢和软铝合金的组合很难或不可能使用传统的点焊甚至自冲铆接来连接。如果这种新工艺被证明可以成功地粘合强度水平差异很大的异种金属合金，它将促进轻金属在汽车和其他运输结构中的更多使用，从而减轻重量并提高燃油效率。