Effect of the feed speed on the surface quality of 6061 Al-alloy using friction stir welding

[摘要] The feed speed is the ratio of the welding speed and the rotation speed, that is, the distance of the workpiece in each rotation of the stirring head, which is one of the important parameters in the friction stir welding process. Based on the different welding speed and rotating speed are combined, the multiple sets of friction stir welding tests were done, the results show that the larger feed speed, cracks or grooves appear on the surface; when the feed speed is reduced, the weld surface is glabrous; continue to reduce the feed speed, the overburning of weld surface is occurred. To further clarify the causes of this phenomenon, the heat flow coupled model was built up based on computational fluid dynamics, the results show that reducing feed speed appropriately will increase the welding heat input, reduce the material involved in the formation of weld, achieve good liquidity, and decrease forward resistance of stirring needle, so the surface quality of the weld becomes better.

[发布机构] College of Mechanical and Electrical Engineering, Shandong Agricultural University, Tai'an; 271018, China^1;Shandong Provincial Key Laboratory of Horticultural Machinery and Equipment, Tai'an; 271018, China^2

[效力级别] 机械制造 [学科分类] 材料科学（综合）

[关键词] 6061 Al alloy;Coupled modeling;Formation of weld;Rotating speed;Rotation speed;Weld surfaces;Welding heat input;Welding speed