Resistance and friction stir spot welding of DP600: A comparative study

Abstract

Efforts to reduce vehicle weight and improve crash performance have resulted in increased application of advanced high strength steels (AHSS) and a recent focus on the weldability of these alloys. Resistance spot welding (RSW) is the primary sheet metal welding process in the manufacture of automotive assemblies. Friction stir spot welding (FSSW) was invented as a novel method to spot welding sheet metal and has proven to be a potential candidate for spot welding AHSS. A comparative study of RSW and FSSW on spot welding AHSS has been completed. The objective of this work is to compare the microstructure and mechanical properties of Zn coated DP600 AHSS (1 . 2 mm thick) spot welds conducted using both processes. This was accomplished by examining the metallurgical cross-sections and local hardnesses of various spot weld regions. High speed data acquisition was also used to monitor process parameters and attain energy outputs for each process. Results show a correlation found among microstructure, failure loads, energy requirements and bonded area for both spot welding processes.

Microstructure and Mechanical Properties of Resistance Spot Welded Advanced High Strength Steels

“…DP600 produced interfacial failure, indicating fracture initiation at the interface and propagation through the centerline. Khan et al 23) showed the relationship between bonded area and failure loads with occurrence of interfacial fracture. However during button pull-out, material properties and FZ diameter are the main determining factors of spot weld strength.…”

Effect of tool geometry on friction stir spot welding of polypropylene sheets

“…FSSW has been succesfully applied to aluminium [9,10], magnesium [11] and steel [12] sheets, but there are very few publications on polymer FSSW applications [13][14][15][16]. The welding parameters and the tool geometry affect friction stir welding and friction stir spot welding stir zonestir zone formation and weld strength [17].…”

Avaliação microestrutural e propriedades mecânicas de um aço TRIP soldado a ponto por fricção e mistura mecânica

“…Já existem alguns estudos sobre o emprego de SPFMM em aços avançados de alta resistência [17][18][19][20], porém eles não incluem aços TRIP.…”