The welding craft equipment structure of the existing wainscot flange is simple and has small pressing force using the welding method of manual welding,while great residual stress and deformation can be obtained in the seam after welding,resulting in bad stability of welding quality.Therefor it can not meet the demand of the products.This paper starts from the influence factors upon flange welding quality,a flange automatic welding craft equipment was developed.Basing on the simulation methord the optimal interference fit quantity of 0.15 to 0.25mm between flange and the aperture has been obtained.The methord of installing wainscot firstly and then flange can effectively prevent the assembly cracks.Heating the bearing plate before welding solves the problem of priming cracks.The appearance of the flangewhich welded by automatic welding process is beautiful,while welding defects are reduced by more than 70％ compared with manual welding.The average tensile strength of welded joints at low temperature (-196℃) reached 348MPa,and the elongation reached 6.7％.%现有的壁板法兰盘焊接工装结构简单,压紧力小,并且为手工焊接,焊后法兰盘焊缝残余应力与变形大,质量稳定性差,不能满足型号使用需求.本文从影响法兰盘焊接质量因素入手,研制了法兰盘自动化焊接工装,在模拟仿真的基础上,得到0.15 ～0.25 mm的过盈装配量法兰盘与孔径采用的过盈量为最优,采用先装壁板后装法兰盘的流程可有效避免装配裂纹,并通过焊前加热垫板的方式解决法兰焊缝打底裂纹难题,采用自动焊工艺焊接的法兰成型美观,焊接缺陷比手工焊降低70％以上,接头低温平均抗拉强度达到348 MPa,延伸率为6.7％.
展开▼
