何浩,李远波,杜鼎臣,等.电极压力对WC-10Co/RM80异种金属精密电阻焊接头质量的影响[J].精密成形工程,2023,15(8):45-52.
HE Hao,LI Yuan-bo,DU Ding-chen,et al.Effect of Electrode Pressure on Quality of Precision Resistance Welded Joints between WC-10Co and RM80 Dissimilar Metals[J].Journal of Netshape Forming Engineering,2023,15(8):45-52. |
| 电极压力对WC-10Co/RM80异种金属精密电阻焊接头质量的影响 |
| Effect of Electrode Pressure on Quality of Precision Resistance Welded Joints between WC-10Co and RM80 Dissimilar Metals |
| 投稿时间：2023-02-23 |
| DOI：10.3969/j.issn.1674-6457.2023.08.006 |
| 中文关键词: 异种金属焊接 精密电阻焊 电极压力 微观组织 力学性能 |
| 英文关键词: dissimilar metal welding precision resistance welding electrode pressure microstructure mechanical property |
| 基金项目:湖南省战略性新兴产业科技攻关项目(2016GK4018);广州市重点实验室专项资助(201605030007) |
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| 中文摘要: |
| 目的 研究不同电极压力下硬质合金/钢电阻点焊接头力学性能和显微组织的变化规律，探究其影响机理。方法 在不同电极压力条件下，对WC-10Co硬质合金扇形粒子与RM80高强度钢带进行异种金属电阻焊接试验。通过电子拉剪试验机进行剪力试验，检测焊接接头的力学性能，采用钨灯丝扫描电镜与场发射扫描电镜观察焊接接头的组织与形貌，使用能谱仪分析接头元素的分布情况。结果 在不同电极压力下，焊接接头外观形貌良好，焊渣挤出量大致相同。当电极压力由110 N增大至140 N时，平均接头剪断力起伏不大，数值大小稳定，当电极压力为120 N时，平均接头剪断力达到最大值(1 367.36 N)。继续增大电极压力，平均接头剪断力显著下降，数值离散程度增大。结论 当电极压力较小时，γ固溶体填充了由凝固收缩现象产生的缩孔，降低了冷却过程中产生的应力，且此时W固溶体相尺寸较小，分布均匀，故焊接接头强度较稳定。当电极压力逐渐增大时，W固溶体相尺寸也随之增大，产生较大的应力集中，平均接头剪断力因此显著下降。当电极压力达到最大180 N时，会因电极压力过大而导致电阻减小，热输入功率反而比电极压力160 N时的热输入功率小。 |
| 英文摘要: |
| The work aims to study the effects of electrode pressure on the mechanical properties and microstructure of precision resistance welding of hard alloys and high-strength steel. The experiments of dissimilar metal resistance welding of WC-10Co hard alloy fan-shaped particles and RM80 high-strength steel strips were conducted under varying electrode pressure conditions. The mechanical properties of the welding joints were evaluated with an electronic universal testing machine, while the microstructure and morphology of the welding joints were observed with a tungsten filament scanning electron microscopy and a field emission scanning electron microscopy, and the distribution of elements on the joint was analyzed with a spectrometer. The study found that the welding joint quality was good and the amount of welding slag extrusion was consistent across different electrode pressure. Results showed that the shear force of the joint remained stable with slight fluctuations when the electrode pressure increased from 110 N to 140 N. The highest average maximum shear force of 1 367.36 N was obtained under an electrode pressure of 120 N. However, as the electrode pressure was increased beyond this point, the shear force of the joint decreased significantly with increased numerical dispersion. When the electrode pressure is low, the γ solid solution fills the shrinkage holes caused by solidification shrinkage, reducing the stress generated during the cooling process. This results in a relatively stable strength of the welding joint, with the (W) solid solution phase smaller in size and evenly distributed. However, as the electrode pressure increases, the (W) solid solution phase also increases, leading to greater stress concentration and a significant decrease in the shear force of the joint. At the maximum electrode pressure of 180 N, the electrode force is too large, resulting in a decrease in resistance and less thermal input power compared with when the electrode pressure was 160 N. |
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