焊接参数对6082-T6挤压铝合金搅拌摩擦焊接头性能的影响

Impact of welding parameters on properties of friction stir welded joint of 6082-T6 extruded aluminum alloy

以工业应用中使用较为广泛的6082-T6挤压铝型材为对象,采用搅拌摩擦焊并选取不同焊接参数,对7mm板厚6082-T6挤压型材进行接头性能研究。研究结果表明:焊缝接头性能对焊接参数较为敏感。当搅拌头转速为1500r/min、焊接速度为(550±50)mm/min时,焊接接头表面成形良好,接头的抗拉强度、屈服强度≥标准值70%,弯曲试样无裂纹。当搅拌头转速提高或焊接速度降低时,焊接过程中飞边量增多,接头表面质量差,甚至产生沟槽缺陷;当搅拌头转速降低或焊接速度提高时,表面成形较好,但焊接接头性能下降。

The 6082-T6 extruded profiles widely used in industrial applications are selected for this study.The FSW(friction stir welding)is adopted,and the properties of weld joints between the profiles with specification of 7mm are studied by selecting different process parameters.The results shown that the properties of weld joints are sensitive to welding parameters.When the rotating speed of the stirring head is 1500r/min and the welding speed is(550±50)mm/min,good welding formation can be achieved on the joint surface,the tensile strength and yield strength of the joint are≥70%of the standard value,and no crack is identified on the bending specimen.When the rotating speed is increased or the welding speed is decreased,fins during the welding process are increased,and poor welding quality is identified on the joint surface,even groove defects are identified.When the rotating speed is reduced or the welding speed is increased,good surface formation can be achieved,however,the joint properties were decreased.