Abstract: Descaling property of oxide scale of welding wire ER70S-6 was studied by twisting test and by scanning electron microscopy. It was found that, silicon rich layer with iron-silicon oxide Fe₂SiO₄ (2FeO· SiO₂) and FeO as the main component just outside of the matrix is difficult to be eliminated completely by mechanical bending and abrasive belt grinding, and thus to deteriorate copper plating effect and welding performance of the wire product. With measures including impeding diffusion of oxygen into the silicon-rich layer by increasing the temperature of the heating section to 985 ℃;and soaking section to 1110℃  in heating furnace, to promote disproportionation reaction of FeO by establishing the thermal insulation wall and by established thermal insulation corridor around the PF line, to decrease the indentation of oxide scale to the matrix by shortening the roll change time of the finishing mill for 3 h, increasing thickness of oxide scale by reducing the spinning speed to 90 m/s and increasing the spinning temperature to 930 ℃, the effect of mechanical descaling of oxide scale is improved. The peeling form of oxide scale changed from the powder to the lamellar, the intermittent blackening of semi-finished product disappeared, the average thickness of the copper plating layer increased from 1.45μm to 3.6μm, and the surface brightness was significantly improved through the process optimization.

摘要： 通过扭转试验和扫描电镜评价了焊丝钢ER70S-6的氧化皮剥离性能。氧化皮和基体之间存在的铁硅氧化物Fe₂SiO₄（2FeO·SiO₂）和FeO为主要成分的富硅层,在机械折弯及砂带打磨过程中难以除净,使焊丝表面镀铜效果及焊接性能恶化。提出了通过提高加热炉加热段温度至985℃、提高均热段温度至1110℃,进而阻碍氧向富硅层的扩散;建立PF线保温墙和保温通廊,进而促进FeO的歧化反应;缩短精轧机换辊时间3h,进而减少氧化铁皮对铁基体的压入;降低吐丝速度至90m/s、提高吐丝温度至930℃进而增加氧化铁皮厚度等方式来改善ER70S-6表面氧化皮剥离性能。工艺优化后,ER70S-6表面氧化铁皮由粉末状脱落变为片层状脱落,粗细拔半成品表面间断性发黑现象消失,镀铜层平均厚度由1.45μm增加至3.6μm,表面光亮度显著提高。