搅拌摩擦焊待焊界面消失模型

提出了一种搅拌摩擦焊接过程中待焊界面消失并形成焊缝的二维模型,阐述了搅拌摩擦焊接过程中待焊界面在焊接热、焊接作用力及搅拌作用下形成焊缝的过程,并把焊缝划分成晶粒长大区、界面氧化区、待焊界面消失区、塑性金属流动区、S线等区域,同时描述了待焊界面冶金熔合后在搅拌摩擦焊缝内部的分布形态.该模型对晶粒长大区、待焊界面消失区、S线3个特定区域进行了试验验证和说明.结果表明,待焊界面在搅拌针后退侧的前方区域已经达到冶金熔合状态,并在搅拌针的搅拌作用下扭曲并进入焊缝形成S线特征.

Model for pre-welding interface disappearance of FSW

A 2D model for the disappearance of pre-welding interface and formation of FSW weld during friction stir welding (FSW) process was established. The forming process of friction stir weld from the pre-welding interface under the combined effects of welding heat,welding force and the stirring was described, and the friction stir weld can be divided into the grain growth zone,interface oxidizing zone,the pre-welding interface disappeared zone,plastic metal flow zone and "S" line zone. Meanwhile,the distribution of the pre-welding interface inside the weld was also identified in this paper. The model verified and explained the grain growth zone, "S" line and the pre-welding interface disappeared zone. The results showed that the prewelding interface was in metallurgical fusion state in the front of retreating side,and it twisted into the weld shaping "S" line under the stirring of the tool pin.