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.

这个探索性研究（SGER）项目的目的是研究一种新的固态连接工艺（称为摩擦连接）的能力，以焊接铝，镁和钢汽车板的不同组合。 汽车工业和美国政府正在积极地寻求在汽车车身结构中使用轻质材料，例如镁合金和铝合金，以提高车辆的燃料效率。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）的组合在汽车白色车身组装中提出了许多技术挑战。其中之一就是将不同的材料连接起来，形成一个满足设计和性能要求的整体结构部件。 目前的工作将研究焊接工艺从一个基本的观点，包括工艺条件对异种合金接头的冶金结合性能的影响。 在初步研究期间，摩擦钻头连接工艺已被证明能够在DP 980钢和5754铝合金的异种合金接头中实现高水平的强度。 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或自冲铆接连接。如果这种新工艺在强度水平相差很大的异种金属合金的连接中取得成功，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。