Sharda Pratap Shrivas; G. K. Agrawal; Shubhrata Nagpal
Abstract
Friction stir welding (FSW) broadly used in the same grade as aluminium alloy but for aluminium alloy material it requires high speed rotation of FSW tool which develops high temperature on tool. In this paper process parameter of FSW are studied based on the strength of welding joint and predict FSW ...
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Friction stir welding (FSW) broadly used in the same grade as aluminium alloy but for aluminium alloy material it requires high speed rotation of FSW tool which develops high temperature on tool. In this paper process parameter of FSW are studied based on the strength of welding joint and predict FSW tool speed as low as possible according to the past literature. Constant machining parameters are tool rotation of FSW is 800 rpm and welding speed 15 mm/min. In this work analysing the strength variation of welding joint under two mode of pre-heating temperature on the work-piece then variation of cooling medium apply after preheating to change the grain structure of work-piece. In this work the FSW process is passed over two pieces of aluminum at once and the effect of tool rotation and temperature of the tool is discussed by preparing the sample for testing according to the ASTM dimension.

Seksak Asavavisithchai; Kantapong Nantakantrong; Karnkawin Jintagetkam
Abstract
Interconnected open-cell Al foams, with various fractions of recycled Al alloy scrap, have been produced using a sintering and dissolution process (SDP). The foams are suitable for various functional applications, such as heat exchangers, bone-replacement implants, interconnects, catalyst supports, and ...
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Interconnected open-cell Al foams, with various fractions of recycled Al alloy scrap, have been produced using a sintering and dissolution process (SDP). The foams are suitable for various functional applications, such as heat exchangers, bone-replacement implants, interconnects, catalyst supports, and sound insulators. Firstly, the NaCl paste was pelletised, by hand, to make spherical balls of approximately 5 mm diameter. The Al alloy scrap was obtained from turning operation in lathe machine. Porous structure was obtained after dissolution of the NaCl balls. The microstructure of Al foams was examined using SEM and EDX. The results show that pores were uniformly distributed along Al matrix and interconnected with surrounding pores. The compressive strength of the foams with small scrap content of 20 wt.% is increased. However, when scrap content is higher, the strength is decreased, as a result of incomplete thermal bonding between Al powder and scrap particle, and excessive oxide content in foam microstructure.
