摘要
采用热电偶测温技术系统测定了6mm6082铝合金双轴肩搅拌摩擦焊试板各特征点的温度变化曲线,分析了双轴肩搅拌摩擦焊过程中焊接试板不同区域的温度场分布特征。双轴肩搅拌摩擦焊搅拌头上、下轴肩同时产热,比传统搅拌摩擦焊产热量大,且热输入方式及试板接触散热条件也有很大不同,因此,其稳定焊接速度较大,从而导致双轴肩搅拌摩擦焊试板温度场分布特征与传统搅拌摩擦焊明显不同。双轴肩搅拌摩擦焊过程分为加速焊接和稳定焊接两个阶段,起始阶段,随着焊接速度的增加,靠近起始端测温点的温度逐渐升高,而远离起始端各测温点的温度升温则非常缓慢,当焊接速度达到较高的稳定焊接速度,搅拌头接近后续各测温点时,其温度值瞬间急剧升高,然后随着搅拌头的远离,温度值逐渐下降。不同区域测温点温度测试结果显示,靠近下轴肩试板测温点的温度高于靠近上轴肩试板、后退侧的温度明显高于前进侧;与单轴肩搅拌摩擦焊接试板相同,距离焊缝越近的位置温度上升和下降的越剧烈,峰值温度越高;焊接速度提高,各测温点的峰值温度依次降低,随着测温点远离焊缝中心,焊接速度对其温度分布的影响作用逐渐减弱。
By applying thermocouple temperature measurement technology,the temperature curves of feature points in 6082 aluminum alloy samples bobbin-tool friction stir welded were measured,and then the characteristic of temperature distributions in different areas of welding samples were analyzed.More heat is created during bobbin-tool friction stir welding （BTFSW）because of the double shoulders,and very different heat elimination conditions compared with traditional friction stir welding （FSW）.So the faster welding speeds were applied during bobbin-tool friction stir welding led the obvious differences between the temperature distributions of BTFSW samples and that of FSW samples.The BTFSW process is divided into the acceleration stage and stable stage.At the first stage,the temperature near the beginning end of samples increased slowly along with the welding speed rising.While the welding speed reached the stable data,400mm/min,the temperature of the subsequent feature points increased rapidly to the peak temperature while the tool arrived near them.Under the same welding condition,the temperature near the lower shoulder is higher than that near the upper shoulder,and the temperature at retreating side is higher than that at advancing side.Increasing welding speed,the peak temperature of each measurement point is lower and lower.With the temperature measuring point away from the weld center,the effect of welding speed on the temperature distributions is gradually weakened.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2013年第5期36-40,共5页
Journal of Aeronautical Materials
基金
重大专项基金资助项目(2011ZX04016-061)
江苏高校优势学科建设工程资助(PDAD)
关键词
双轴肩搅拌摩擦焊
温度场
6082铝合金
Bobbin-tool friction stir welding
temperature field
6082 aluminum alloy
