某出口低合金钢转向架焊接构架的焊接工艺评定对该焊接接头的低倍检验有较高的要求。通过合理配制腐蚀溶液, 增加腐蚀溶液的种类, 并严格规范腐蚀步骤, 确定了合理的低倍检验用金相试样的制备工艺。结果表明: 使用8%硝酸酒精溶液(体积分数)及过硫酸铵饱和水溶液制备的焊接接头金相试样各区域清晰可见, 制样质量稳定, 能够满足该焊接构架的焊接工艺评定要求。

According to qualification requirements of the welding procedure of the exported welding bogie frame made from low alloy steel, the requirement of the macroscopic inspection of the welding joints was relatively high. Through reasonably preparing the corrosive solution, increasing the type of corrosion solution, and strictly regulating the corrosion process, the reasonable preparation process of metallographic specimens for macroscopic inspection was determined. The results show that: each region of the metallographic specimens of the welding joints corroded by 8% (volume fraction) nitric acid alcohol solution and saturated aqueous solution of ammonium peroxydisulfate was distinct, and the preparation quality was stable, which could fully meet qualification requirements of the welding procedure.