摘要：本文对1mm3003-H32铝合金的铝板采用高转速搅拌摩擦焊接，设计了一种高转速焊接工艺方法。搅拌摩擦焊接时，其焊接热输入相对于熔化焊较小，接头残余应力小，变形小，焊缝性能良好。研究其在不同的焊接参数下，工件的焊缝成形与焊缝质量。通过金相观察、拉伸与硬度试验等方法分析其显微组织和力学性能。
对焊后焊缝性能进行分析，当主轴转速达到10000rpm以上时，可以完成对接，焊缝成形好，没有明显缺陷。形成的晶粒整体大小一致，且都较为细小，呈现等轴晶分布。当主轴转速一定时，随着焊速的增加，焊缝抗拉强度先增加，达到最大值后，再减小。主轴转速为11000rpm，焊速为1000mm/min时，焊缝强度达到最高，约占母材强度的78%。此时的焊接接头的硬度较母材低，平均硬度为28HV，与常规的搅拌摩擦焊接头硬度分布相比“W”型并不明显，只有在焊缝的表层、焊核部分硬度分布有一定的凸起，前进侧（AS）的硬度值与后退侧（RS）的硬度值没有呈现对称分布，前进侧的硬度略高。通过研究发现，加速段的前进阻力较大，在20-60N范围波动，最大达到60N。相对于常规搅拌摩擦焊的前进阻力要小得多，焊缝质量也得到了不同程度的提高。对于薄板铝合金焊接来说，这一发现，对于高转速搅拌摩擦焊接的研究具有重大的意义。
关键词：高转速；搅拌摩擦焊；薄板铝合金；组织与性能；前进阻力
Abstract：In this paper, a high speed welding process is designed for high speed friction stir welding of 1mm3003-H32 aluminum alloy aluminum plate. The Stirring welding, the welding heat input relative to the smaller welding, Joint residual stress is small, deformation is small, good weld performance. The weld quality and the weld quality of the workpiece under different welding parameters were studied. The microstructures and mechanical properties were analyzed by metallographic observation, tensile and hardness tests.
After welding the weld performance analysis, when the spindle speed reaches 10000rpm or more, you can complete the docking, weld forming good, no obvious defects.The formation of the overall size of the same grain, and are relatively small, showing equiaxed crystal distribution. When the spindle speed is constant, with the increase in welding speed, weld tensile strength first increase to reach the maximum, and then reduce. Spindle speed of 11000rpm, welding speed of 1000mm / min, the weld strength to the highest, about the base metal strength of 78%. The hardness of the welded joint at this time is low, the average hardness of 28 HV, compared with the conventional friction stir welding joint hardness distribution "W" type is not obvious, The hardness of the advancing side (AS) and the hardness value of the back side (RS) do not show a symmetrical distribution, and the hardness of the advancing side is slightly higher than that of the weld surface. Through the study found that the acceleration section of the forward resistance is larger, in the range of 20-60N fluctuations, up to 60N. Relative to the conventional friction stir welding forward resistance is much smaller, the weld quality has also been improved to varying degrees. For thin-plate aluminum alloy welding, this discovery, for high-speed friction stir welding research is of great significance.
Key words: High speed; Friction Stir Welding; Sheet aluminum alloy; Organization and performance; Forward resistance
目 录
第一章绪论 1
1.1选题背景和意义 1
1.2搅拌摩擦焊 2
1.2.1搅拌摩擦焊原理 2
1.2.2搅拌摩擦焊的特点 3003薄板铝合金高转速搅拌摩擦焊接工艺研究:http://www.chuibin.com/cailiao/lunwen_205166.html