Mechanical properties of friction stir butt‐welded Al‐5086 H32 plate

Abstract

Al-5086 H32 plates with a thickness of 3 mm were friction stir butt-welded using different welding speeds at a tool rotational speed of 1600 rpm. The effect of welding speed on the weld performance of the joints was investigated by conducting optical microscopy, microhardness measurements and mechanical tests (i.e. tensile and bend tests). The effect of heat input during friction stir welding on the microstructure, and thus mechanical properties, of cold-rolled Al-5086 plates was also determined.The experimental results indicated that the maximum tensile strength of the joints, which is about 75 % that of the base plate, was obtained with a traverse speed of 200 mm/min at the tool rotational speed used, e.g. 1600 rpm, and the maximum bending angle of the joints can reach 180 o . The maximum ductility performance of the joints was, on the other hand, relatively low, e.g. about 20 %. These results are not unexpected due to the loss of the cold-work strengthening in the weld region as a result of the heat input during welding, and thus the confined plasticity within the stirred zone owing to strength undermatching. Higher joint performances can also be achieved by increasing the penetration depth of the stirring probe in butt-friction stir welding of Al-5086 H32 plates.

Microstructural and mechanical characterisation of 5XXX-H111 friction stir welded tailored blanks

“…Some efforts were also put to study the FSW of the AA 5754, 25 AA 5052, [26][27][28] AA 5456, 29,30 AA 5251, 31,32 AA 5182 33 and AA 5086 34,35 series of alloys. Some of these authors analysed the influence of the rotating speed, 25,27 the advancing speed, 12,34 both of these factors together 15,18,19 and even the interaction of tool's geometry with these parameters 12,19,25 on weld quality.…”

Effect of Friction Stir Processing on Gas Tungsten Arc-Welded and Friction Stir-Welded 5083-H111 Aluminium Alloy Joints

“…e GTAW method has been the preferred method for welding aluminium alloys due to its cleanliness, but recently, the preference has shifted towards FSW. is shift is due to the fact that FSW is clean and does not produce any gas to the atmosphere, hence considered as green technology as well as fusion welding techniques such as arc welding result in several problems, namely, porosity formation, loss of strength, and cracking particularly in high strength Al-alloys [5][6][7][8][9]. Friction stir welding (FSW) is a solid-state welding method, which is invented by the welding institute (TWI) and has been well demonstrated particularly suited for the joining of aluminium alloys [10][11][12][13][14][15][16].…”

Microstructure and Mechanical Properties of AA5086 Aluminum Alloy by Friction Stir Welding

“…This amount of ductility, i.e. 25%, is very common in the Al-alloys (practically cold-work or precipitation hardened grades) because of the loss of strength within the weld nugget zone [17]. It should be mentioned that the recrystallization process is not completed with increasing the welding speed due to the refining of the grains and their uniform distributions within alloy matrix [18].…”