The Effect of RFSSW Parameters on the Load Bearing Capacity of Aluminum 7075-T6 Sheet Metal Joints

Abstract

Friction Stir Spot Welding is one of the most contemporary methods of joining metals and alloys in their solid state. The ability to join elements made of aluminum alloys allows for utilizing this method in the manufacturing of aircraft structures while lowering the work load, costs, and weight, without sacrificing or even having better strength parameters than classic methods of joining elements. It ensures constant joint parameters, however it requires the use of optimal welding parameters such as: the rotational speed of the tool, tool delve depth, and welding time. The work presents the results of experiments conducted on 7074 aluminum sheet metal that was 1.8 and 0.8 mm thick, which conducted in accordance with the PS/DK32 research plan. The welding tests were done on a dedicated spot welding machine, while the strength tests consisted of static tensile strength tests. In the final part of the article contains an analysis and interpretation of the results.

Experimental investigation of the degree of weakening in structural notch area of 7075-T6 aluminum alloy sheet welded with the RFSSW method

“…The parameters in this study were selected on the basis of previous tests of the authors [14,16]. A constant tool rotational speed of 2600 rpm and plunging time of 1.5 s were adopted in the study.…”

“…However, determining the correct welding parameters causes multiple problems. The quality of RFSSW spot welds depends on such welding parameters as" plunge depth [13,14], tool rotational speed [9,14,15] and welding times [9,14], which are a subject of analysis of numerous researches. Unfortunately, these articles offer no information regarding the degree of weakening of the welded sheet obtained by RFSSW method.…”

Alloys for Aeronautic Applications: State of the Art and Perspectives

“…Many advantages are related to spot welding, causing a decline in the riveting and gluing of Al alloys: (i) the drilling of parts and the use of rivets as additional fasteners are not required; (ii) a great resistance to corrosion can be achieved for welded joints; (iii) the possibility to perform simple repairs of joints; (iv) no part of the joint extends beyond the surface of the joined elements. The optimization of the RFSSW parameters to get the best mechanical performances of joints has been studied by many authors [66][67][68][69][70].…”