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在汽车上市两年后的质检中发现,其车架焊道发生腐蚀。腐蚀的原因是焊接过程中产生了Fe、Si、Mn等氧化物,而该氧化物不导电,使其电泳时表面无电泳漆。对车架焊道防腐处理工艺的改进方案进行了讨论,确定了将保护气由单一的CO2改为80%Ar+20%CO2混合保护气的方案,并对恶劣环境使用的汽车采用底盘装甲的方案。改进后,焊道表面的氧化结晶体大幅度减少,防腐能力增强,产品质量优于同类合资品牌。
Two years after the car was listed in the quality inspection found that the frame weld corrosive. Corrosion due to the welding process produced Fe, Si, Mn and other oxides, and the oxide is not conductive, so that the surface without electrophoretic paint electrophoresis. The improvement of the weld bead anticorrosive treatment process was discussed. The scheme of changing the shielding gas from single CO2 to 80% Ar + 20% CO2 mixed protective gas was determined and the chassis armored Program. After the improvement, the oxidized crystal on the weld bead surface greatly reduces, the anti-corrosion ability is enhanced, and the product quality is superior to the joint venture brand of the same kind.