Produção Nacional
Effect of process parameters in obtaining aluminium–steel joints and their microstructure by friction stir welding (FSW)
2014; Taylor & Francis; Volume: 29; Issue: 9 Linguagem: Inglês
10.1080/09507116.2014.932989
ISSN1754-2138
AutoresEdwar Andrés Torres López, Antonio J. Ramírez,
Tópico(s)Aluminum Alloy Microstructure Properties
ResumoThe successful results presented in the literature on friction stir welding (FSW) of aluminium–steel joints ignore the appearance and formation of defects on the joint as reference points for evaluation. It also increases the controversy about the presence of intermetallic compounds of the type FexAly, and the lack of information about its origin. The objective of this study is to determine appropriate parameters for obtaining aluminium–steel joints free of defects, and their relationship to the formation of deleterious phases during FSW. Consolidated welded joints were obtained and the microstructure resulting from these welded joints of aluminium alloy 6063-T5 and AISI steel SAE 1020 was determined. A tungsten carbide tool (WC-14Co) was used at rotation and weld speeds of 300 rpm and 150 mm min− 1, respectively. The results highlight the importance of heat input in obtaining aluminium–steel joints with adequate surface appearance and penetration. The microstructural analysis reveals the formation of seven regions in the welded joint, highlighting the thermo-mechanically affected zone on the steel, a band of ultra-fine grains of ferrite and the absence of intermetallic compounds on the aluminium–steel interface.
Referência(s)