Abstract

Spot friction welding (SFW) was performed on ultra high strength steel (UHSS) steel sheet commonly used in automobile manufacturing. Alloys studied included DP780, DP780EG, DP980, and DF140T sheet steel of varying thickness from 1.2 mm to 1.4 mm. Welding was accomplished using a PCBN standard tool. Weld strengths were then compared to a proposed AWS standard. Initial hardness readings were taken in cross sectioned samples. Grain structure in a SFW is presented. Resistance spot welds were created in three steels. This study focuses on the strength of SFW joints as compared to traditional resistance spot welding (RSW) in welding like materials to one another. Cycle times of SFW were also evaluated and compared to production rate cycle times of RSW.

Degree

MS

College and Department

Ira A. Fulton College of Engineering and Technology; Technology

Rights

http://lib.byu.edu/about/copyright/

Date Submitted

2007-03-12

Document Type

Thesis

Handle

http://hdl.lib.byu.edu/1877/etd1724

Keywords

spot friction welding, spot friction weld, spot welding, spot weld, ultra high strength steel, automotive sheet steel, UHSS, dp780, dp980, PCBN

Technology Emphasis

Manufacturing Systems (MS)

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