Development of simultaneous double side corner FSW process using Ad-Stir technique for LNG tank construction
- Masaki K. ,
- Saito H. and
- Nezaki K.
- Masaki K. ,
- Saito H. and
- Nezaki K.
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A simultaneous double sided corner Ad-Stir fillet stationary shoulder friction stir welding (SSFSW) process was developed for LNG (liquefied natural gas) storage tank construction. The microstructure and mechanical properties of welded joints were investigated, and process stability was determined by a long length welding test. Experiments were conducted on 5083-O aluminium alloy (Al, 4-4.9%Mg, 0.4-1%Mn, 0.05-0.25%Cr) plates using threaded welding probes and stationary shoulders with a chamfered corner shape made from H13 tool steel. Partial penetration corner SSFSW was performed at a travel speed of 200 mm/min and a rotational speed of 500-1500 rpm. Weldment cross sectional microstructure was observed by optical microscopy. Mechanical properties were characterised by tensile tests. Process stability was enhanced by optimising the friction between the workpiece and the shoulder, and tool life was improved by modifying tool shape and the tool cooling system.
11th International Symposium, 17-19 May 2016, Session 2A: Applications I, Paper 03
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