Heating characteristics of continuous feeding flux strips constrained arc in ultra-narrow gap welding

超窄间隙焊接中送进式焊剂带约束电弧的加热特性 Heating characteristics of continuous feeding flux strips constrained arc in ultra-narrow gap welding 陈欢 CHEN Huan 1 first-author 朱亮 ZHU Liang 1 corresp zhul@lut.cn 姚仁 YAO Ren 1 张爱华 ZHANG Aihua 2 汤国玺 TANG Guoxi 1 兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室 兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室 Lanzhou University of Technology jointly established the State Key Laboratory of Advanced Processing and Reuse of Non-ferrous Metals Lanzhou University of Technology jointly established the State Key Laboratory of Advanced Processing and Reuse of Non-ferrous Metals 兰州理工大学电气工程与信息工程学院 兰州理工大学电气工程与信息工程学院 School of Electrical Engineering and Information Engineering, Lanzhou University of Technology School of Electrical Engineering and Information Engineering, Lanzhou University of Technology 开发了一种连续送进式焊剂带约束电弧超窄间隙焊接方法,通过改变焊剂片厚度和送带速度进行工艺试验,分析各参数下的电弧的加热特性。结果表明,增加焊剂片厚度和送带速度能够增强对电弧的约束效果,使焊缝根部熔化宽度增加,侧壁熔化高度减小;增大焊剂片熔化系数,熔化后焊剂片的固壁约束高度也会变大,电弧在侧壁燃烧的高度变小,提高电弧能量密度,更有利于电弧对侧壁根部的加热。当焊剂片熔化系数小于0.31时,熔化后焊剂片的固壁约束高度较小,电弧对侧壁的加热效果增强。 A continuous feeding flux strips constrained arc ultra-narrow gap welding method was developed. The process test was carried out by changing the thickness of flux sheet and the feeding speed of flux strip, and the heating characteristics of the arc under various parameters were analyzed. The results show that increasing the thickness of flux sheet and the feeding speed of flux strips can enhance the restraint effect on the arc,increase the melting width of the weld root and reduce the melting height of the side wall; Increasing the melting coefficient of the flux sheet will increase the constrained height of the fixed wall of the melted flux sheet, and the height of the arc burning on the side wall will decrease, so that the arc energy density increases, which is more conducive to the arc heating the root of the side wall. When the melting coefficient of the flux sheet is less than 0.31, the constrained height of the fixed wall of the melted flux sheet is smaller, and the heating effect of the arc on the side wall enhances. 超窄间隙焊接 送进式焊剂带 加热特性 固壁约束高度 ultra-narrow gap welding feeding flux strips heating characteristics fixed wall constrained height TG444 国家自然科学基金（61866021）;流程工业综合自动化国家重点实验室开放基金（PAL-N201808） 2022-03-08 9 51