摘要
对0.8 mm厚6061铝合金超薄板微搅拌摩擦焊过程进行测温实验,并对微搅拌摩擦焊过程工件温度控制技术进行研究,分别研究了工艺参数如焊接速度、主轴转速、下压量以及焊接过程外加压缩空气冷却等因素对微搅拌摩擦焊过程工件温度的影响。测温实验结果表明,随焊接速度的升高,焊接热输入降低,温度峰值下降,冷却速度值减小,主轴转速越高,热输入越大,温度峰值上升,冷却速度值增大。当下压量增大,产热剧烈升高,下压量从0.05 mm增大至0.1 mm,距离焊缝5 mm处的温度峰值从72.28℃上升至115.06℃,增加了54.65%。在保证焊接质量的前提下,尽量降低下压量对控制温度峰值具有良好的效果。此外,外加气冷是控制温度峰值的有效手段,对冷却速度的影响最大。加气冷时冷却速度值增大约为未加气冷时的4倍,有利于降低高温停留时间,改善焊缝冷却过程。
On 0.8 mm thick 6061 aluminum alloy thin plate micro friction stir welding process experiment,the microstructure and fric, tion stir technology research of workpiece temperature control of welding process,were studied.The process parameters such as welding speed, spindle speed ,reduction and the welding process and compressed air cooling and other factors on the impact of Micro Friction Stir wehting process the experimental results show that the temperature,temperature,with the increase of welding speed, welding heat input decreased,the peak temperature decreased, the cooling rate decreases,the spindle speed is high,the heat input increases, the peak temperature rise,the cooling rate increases.The pressure increased,heat production sharply increased,under the pressure of increased from 0.05 mm to 0.1 mm,the peak temperature from welding seam 5 mm increased from 72.28 ℃ to 115.06 ℃, an increase of 54.65%.1n order to ensure the welding quality,and reduce the pressure measurement has a good effect on controlling the peak temperature.In addition,plus gas cooling is an effective means to control the temperature peak,influence on the cooling speed. Aerated cold cooling rate increases as the non aerated cooling time is about 4 times,to reduce the high temperature and residence time, improve the weld cooling process.
出处
《电焊机》
北大核心
2014年第4期71-77,共7页
Electric Welding Machine
基金
国防基础科研资助项目(A0320110014)
上海市优秀技术带头人资助项目(13XD1421300)
关键词
铝合金
超薄板
微搅拌摩擦焊
温度分布
aluminum alloy
thin plate
micro friction stir welding
temperature distribution
