1. Petar Tasić, Faculty of Mechanical Engeneering, Sarajevo,
Federation of Bosnia and Herzegovina
, Bosnia and Herzegovina
2. Ismar Hajro, Faculty of Mechanical Engeneering, Sarajevo,
Federation of Bosnia and Herzegovina
, Bosnia and Herzegovina
3. Damir Hodzic, Faculty of Mechanical Engeneering, Sarajevo,
Federation of Bosnia and Herzegovina
, Bosnia and Herzegovina
4. Dragoslav Dobraš, Mašinski fakultet Univerziteta u Banjoj Luci,
Republic of Srpska, Bosnia and Herzegovina
The difficulty of making high-strength, fatigue and fracture resistant welds, particularly in al-uminium alloys such as highly alloyed 2XXX and 7XXX series, has long inhibited the wide use of welding for joining aerospace and other engineering structures. Such alloys are generally classified as non-weldable or hardly-weldable because of problems connected with the poor solidification microstructure and porosity in the fusion zone. In addition, the difference in me-chanical properties as compared to the base material is very significant. These factors make the joining of these alloys by conventional welding processes unattractive and sometimes almost impossible. Some aluminium alloys can be resistance welded, but the surface preparation is expensive, with surface oxide being a major problem. Friction stir welding (FSW) is a relatively new solid-state joining process. In particular, it can be used to join high-strength aerospace aluminium alloys and other metallic alloys that are hard to weld by con-ventional fusion welding. FSW is considered to be one of the most significant developments in metal joining in past decades from many points of view, especially regarding energy effi-ciency. Therefore it is labelled as “green technology” and it is highly environmental friendly. While the bulk of the information is related to aluminium alloys, important results are available for other metals and alloys.
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Datum:
28.02.2013.
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