焊接用热轧盘条表面氧化铁皮结构优化

本溪钢铁集团北营公司生产的H08A盘条所制焊条在下游客户使用过程中,出现焊接烟尘量较大问题。检测分析结果表明,盘条母材表面氧化铁皮结构异常是导致焊接烟尘量大的主要原因。通过优化轧制工艺,调节盘条冷却温度及冷却速度,加快盘条在900~800℃区间及600~450℃区间的冷却速度,在不影响盘条正常组织的前提下,合理改善表面氧化铁皮结构,消除内层Fe3O4,增大Fe O比例,降低焊条使用时的焊接烟尘量,改善了焊接作业环境。

Optimization of Microstructure of Oxidized Scales on Surface of Hot Rolled Wire Rods for Welding

There was the problem that heavy weld fumes occurred in welding by downstream customers when using welding rods made by H08A wire rods produced by Beiying Company of Benxi Iron & Steel Group Corporation. According to the analytical results by detection, the abnormal microstructure of the oxidized scales on the surface of the base wire rods was the major cause leading to heavy weld fumes. So some corresponding measures was taken, which includes adjusting the cooling temperature and cooling velocity for wire rods, increasing the cooling velocity for wire rods between 800℃ and 900 ℃and between 450℃ and 600 ℃by optimizing the rolling process and suitably improving the microstructure of the oxidized scales on the surface of wire rods to eliminate the intimal Fe3O4 and increase the proportion of FeO providing that the normal microstructure of wire rods was not influenced. As a result, the amount of weld fumes was decreased and the working environment was improved.