Research on the influence mechanism of brazing seam geometry on gas pores in brazed joints  

作　　者：Cheng Zhan Long Weimin Xue Songbai Fu Yucan Wu Mingfang 程战;龙伟民;薛松柏;傅玉灿;吴铭方(China Innovation Academy of Intelligent Equipment(Ningbo)Co.,Ltd,Ningbo 315700,China;Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Zheng Zhou Research Institute of Mechanical Engineering Co.,Ltd,Zhengzhou 450001,China;Jiangsu University of Science and Technology,Zhenjiang 212100,China)

机构地区：[1]China Innovation Academy of Intelligent Equipment(Ningbo)Co.,Ltd,Ningbo 315700,China [2]Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China [3]Zheng Zhou Research Institute of Mechanical Engineering Co.,Ltd,Zhengzhou 450001,China [4]Jiangsu University of Science and Technology,Zhenjiang 212100,China

出　　处：《China Welding》2020年第4期13-18,共6页中国焊接（英文版）

基　　金：supported by the 2020 Ningbo"3315 Talent Introduction Plan"Innovative Team (C-Class);Henan Province's Major Key Technology Demand Unveiling and Tackling Key Projects (Grant No. 191110111000)。

摘　　要：Gas pore is a common defect in brazed joint. It lowers the brazing rate and affects the properties of joint. Experimental results show that the application of unequal-gap brazing seam effectively decreases the amount and volume of gas pores, and increases brazing rate.This paper establishes a force model of unequal-gap brazing seam, and proposes the constitutive relationship between expulsion force and curvature. The force condition of gas bubble in geometrically different brazing seams were calculated, and the results were verified with experiments. The results show that the expulsion force of gas bubble is positively correlated to the curvature of the seam geometry. The gas bubble tends to move towards the direction with large curvature and wider gap. The directional bubble movement is obtained through varying the configuration of gas-liquid interface to meet geometric conditions. Gas bubble accelerates to expulse with arc, hyperbola and cycloid brazing seams, in which the best drainage effects of gas bubble occur for cycloid seams.

关 键 词：BRAZING brazing seam CYCLOID COMPACTNESS 

分 类 号：TG454[金属学及工艺—焊接]