Forming Process Optimization of Wire and Arc Additive Manufactured High-strength Steel ER120S-G

doi:10.3969/j.issn.1004-132X.2023.02.012

Abstract

Abstract: Aiming at the problems of lap spacing optimization for ER120S-G high-strength steel based on wire and arc additive manufacturing process， the pulsed gas metal arc welding（GMAW-P）processes were adopted to perform Canny edge extraction and Gaussian smoothing filtering for 5 sets of single-layer weld passes， and different functions were selected to fit the single-pass morphology. Conventional lap model and optimized slant-top lap model were compared， and the optimal lap spacing of them was calculated. The results show that， the sine function fits the weld contour best in the GMAW-P process of high-strength steel， and the optimal lap spacing from the optimized slant-top lap model is as 0.66 times of the weld width. Based on the above results， multi-layer multi-pass bulk samples were fabricated， and the surface quality is good and without obvious defects. The bulk mainly contains needle ferrite， granular bainite， and M-A elements. The tensile strength is anisotropic.

Key words: wire and arc additive manufacturing, high strength steel, surface topography, mechanics property

摘要： 针对ER120S-G高强钢电弧增材制造搭接间距的工艺优化问题，采用脉冲熔化极气体保护焊（GMAW-P）工艺，对5组单层焊道进行Canny边缘提取和高斯平滑滤波，并选用不同函数对单道形貌进行拟合。比较了常规搭接模型和优化的斜顶搭接模型，并计算出它们的最优搭接间距。研究结果表明，对于高强钢GMAW-P工艺，采用正弦函数拟合焊道边缘的效果最佳，并且采用优化的斜顶搭接模型得到的最优搭接间距为0.66倍的单道宽度。基于上述优化结果试验成形了多层多道块体样件，成形表面质量良好无缺陷，块体组织主要为针状铁素体、粒状贝氏体以及M-A组元等，抗拉强度呈现一定的各向异性。

关键词: 电弧增材制造, 高强钢, 表面形貌, 力学性能

CLC Number:

TG444.77

FANG Xuewei, JIANG Xiao, WANG Zhe, WU Xiaokang, HUANG Ke. Forming Process Optimization of Wire and Arc Additive Manufactured High-strength Steel ER120S-G[J]. China Mechanical Engineering, 2023, 34(02): 218-225.

方学伟, 蒋笑, 王喆, 武晓康, 黄科. ER120S-G高强钢电弧增材制造的工艺优化[J]. 中国机械工程, 2023, 34(02): 218-225.

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