The Optimized Disign And Failure Study On Pin Tool Of Friction Stir Welding Of Copper Alloy

FSW is a new type of solid-phase connection technology,and its emergence in the field of welding caused a sensation,is considered to occur since the laser welding technology has the potential of the most eye-catching and most of the connection technology.Friction Stir Welding as a result of its unique advantages,attracting an increasing number of research institutions into research work in this area so that friction stir welding technology have developed rapidly.So far,the study of friction stir welding of aluminum alloy welding from other materials to welding such as copper,titanium,magnesium and stainless steel,etc..The topic for the copper alloy stirring of FSW to test the first study,to be reasonable to optimize the mixing and stirring the first to conduct a preliminary analysis of the first failure.Choose T10,9CrWMn,4Cr5MoSiV,GH4169 and GH864 five mixing the first material,the production of different shapes and sizes mixed friction stir welding the first test carried out by mixing the first material optimized for GH4169 and GH864, which can basically meet the needs of two materials 5mm thick H62 copper alloy FSW requirements.Mixing the first choice of platform shape and shoulder-type shaft with concave cylindrical and frustum of a cone-shaped mixing needle,when the shaft shoulder diameter,pin diameter and the mixing ratio of about 3:1 would be ideal when the weld,stirring the first is also the best performance.Shapes and sizes with different design,mixing the first test,the use of home-made force platform and infrared temperature sensing device on the welding process carried out by mixing the first power and temperature measurements,the data for the auxiliary mixing head to optimize the design of shapes and sizes,at the same time Comparative analysis of different mixing after the first welding seam forming the surface and internal quality,joint microstructure and mechanical properties of the mixing head to optimize the shape of the size parameters.Optimized mixing of the first test for life,in the speed of 630rpm,weld speed for 70mm/min parameters,the mixing head can be optimized to achieve the total welding length of 1530mm.Stir welding process on the failure of the first test and found that the course of the next pressure,stirring until the needle in the fracture is mainly the "upsetting" failure deformation;road stirred the first occurrence of the process of wear and fracture failure,and the mixing head of the abrasion can be divided into bonding and brittle spalling wear,oxidation wear,diffusion wear,abrasive wear and so on.The use of finite element software DEFORM-3D simulation of the initial H62 copper alloy friction stir welding process of mixing the first temperature distribution, and experimental measurement data,the basic agreement.Wear based on the perspective of the development of failure of copper and copper alloy friction stir welding is conducive to improve and enhance the friction stir welded joints of the quality and efficiency,in order to follow-up of the friction stir welding process to provide support to achieve.