基本信息
项目批准号：51775143
申请代码：E0508
项目名称：静轴肩支撑搅拌针倾斜穿透搅拌摩擦焊接新(xīn)方法及接头形成机理(lǐ)研究
项目负责人：刘会杰
依托单位：哈尔滨工业大學(xué)
研究期限：2018-01-01 至 2021-12-31
资助经费：61.0（万元）
项目摘要
中文(wén)摘要：
针对常规搅拌摩擦焊由于搅拌针長(cháng)度小(xiǎo)于被焊工件厚度而难以避免焊缝根部形成未焊合缺陷及其引起接头性能(néng)降低的问题，提出一种静轴肩支撑搅拌针倾斜穿透搅拌摩擦焊接新(xīn)方法。该方法摒弃了常规搅拌摩擦焊采用(yòng)的背部垫板，设计带有(yǒu)中心盲孔的静轴肩承受轴向载荷，能(néng)够实现带有(yǒu)倾角的穿透型搅拌摩擦焊接，在完全避免未焊合缺陷产生的同时，有(yǒu)效降低焊接过程的热输入，获得优质高强的搅拌摩擦焊接头。.采用(yòng)试验研究、理(lǐ)论分(fēn)析和数值模拟相结合的研究方法，建立一套静轴肩支撑搅拌针倾斜穿透搅拌摩擦焊接系统，重点研究焊接温度场及材料流动行為(wèi)，分(fēn)析焊接载荷随焊接工艺参数的变化规律，阐明接头微观组织与接头性能(néng)的相关性，揭示静轴肩支撑搅拌针倾斜穿透搅拌摩擦焊接头形成机理(lǐ)，实现焊接工艺参数优化，為(wèi)高强铝合金构件的焊接制造提供新(xīn)的技术手段和理(lǐ)论依据，推动搅拌摩擦焊接技术的创新(xīn)发展。
英文(wén)摘要：
The kissing bond is inevitably formed in the conventional friction stir welded joint due to the fact that the length of tool pin is shorter than the workpieces thickness, and thus resulting in the reduction of joint mechanical properties. Aiming at the elimination of kissing bond and the improvement of joint properties, an innovative welding process, i.e. stationary shoulder supporting and oblique pin penetrating friction stir welding (SOFSW), is proposed. In such a process, in order to bear the axial load exerted by the shoulder, the backing plate used in conventional friction stir welding is replaced by a stationary shoulder with a blind hole in the center. This key design ensures that the workpieces are penetrated by the pin and thus the kissing bond is completely eliminated. Moreover, the heat input during welding could be significantly reduced. As a result, the sound SOFSW joints with high quality are obtained. .By means of experimental research, theoretical analysis and numerical simulation, a set of SOFSW system is developed. The research is focused on the temperature field distribution, material flow mechanism, evolution of welding load with welding parameters, correlation between microstructures and properties, and the formation mechanism of SOFSW joints. Based on this, the optimization of welding process parameters is accomplished. The final objective is to provide an advanced welding process and lay a theoretical basis for the reliable joining of high-strength aluminium alloys used in aerospace structures, and thus promoting the innovative developing of friction stir welding technique.
                                                                                                                                                                                                         ——来自https://kd.nsfc.gov.cn/