低合金钢角焊缝剪切性能评价方法研究  

Study on Evaluation Methods for Shear Property of Low Alloy Steel Fillet Weld

作　　者：纪昂 陆智俊 张立平 彭根琛[1] JI Ang;LU Zhijun;ZHANG Liping;PENG Genchen(Jiangsu XCMG Construction Machinery Research Institute Co.,Ltd.,Xuzhou 221004,China;School of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,China)

机构地区：[1]江苏徐工工程机械研究院有限公司,江苏徐州221004 [2]燕山大学机械工程学院,河北秦皇岛066004

出　　处：《电焊机》2024年第9期105-110,共6页Electric Welding Machine

基　　金：江苏省自然科学基金资助项目(BK20220231);徐州市国际科技合作类项目(KC22341)。

摘　　要：角焊缝等承载计算方法在角焊缝焊脚尺寸低成本设计方面发挥了重要作用,但同时该方法也对焊丝熔敷金属剪切性能的定量计算提出了新的要求。本文采用搭接接头角焊缝进行低合金钢焊丝熔敷金属剪切性能仿真及试验研究,通过提出新的焊缝抗剪强度计算公式,并基于研究结果给出推荐的剪切性能评价方法。结果表明:角焊缝的剪切开裂角度在22.5°附近,仿真计算获得的不同角度下角焊缝剪切应力变化曲线也证明了该结论。熔深的存在并不会影响开裂角度,但是会起到增大焊脚的作用。焊丝熔敷金属剪切性能评价试验应采用一般尺寸、多道焊形式,从而获得具有代表性的熔敷金属剪切强度。另外推荐采用“求和计算断裂面宽度”的方式来获得剪切强度,虽然剪切强度会降低10%左右,但由于通过直接定义开裂角度为理论角度,断裂面宽度为“焊脚+熔深”,因此可以尽可能地减少测量导致的误差因素,有效增加计算结果的普遍适用性。In recent years,the equal load-carrying calculation method for fillet welds has played a significant role in the low-cost design of fillet weld sizes.At the same time,this method has also posed new requirements for the quantitative calculation of the shear performance of the deposited metal.In this paper,the simulation and experimental study on the shear properties of deposited metal from low alloy steel welding wire are carried out by using the lap joint fillet weld.A new formula for calculating the shear strength of fillet weld is proposed,and a recommended method for evaluating the shear properties is given based on the research results.The results show that the shear cracking angle of fillet weld is around 22.5°,and the existence of penetration does not affect the cracking angle,but equal to the increasing of weld size.The test should adopt the general size,multi-pass welding method,so as to obtain the representative shear strength of the deposited metal.In addition,it is recommended to calculate the sum size of the fracture surface to obtain the shear strength.Although the shear strength will be reduced by about 10%,the influencing factors can be much less and the general applicability of the calculation results can be effectively increased by directly defining the cracking angle as the theoretical angle and the width of the fracture surface as"weld size plus penetration".

关 键 词：熔敷金属 剪切性能 剪切膜应力 断裂角度 

分 类 号：TG407[金属学及工艺—焊接]