适于镀锌钢板激光焊接的CO2激光切割

研究适合于裁焊板生产的板坯切割的技术方案，重点讨论了CO2激光切割。采用氮气辅助激光切割，氧气辅助激光切割，铣切和普通剪切方法进行了镀锌钢板的切割。研究表明，氮气辅助CO激光切割方正度较好，切口质量符合裁焊板拼接间隙小于0．1mm的要求。激光切割时，由于热影响范围小，镀锌钢板切口边缘镀锌层烧损范围小，整个切缝无宏观残余形变。氮气辅助CO2激光切割具有切割速度快，质量好的优点，适合于进行裁焊板的板坯切割。

CO2 laser cutting for galvanized tailored welded blank

This paper explores a cutting technology for galvanized tailored welded blank, with a focus on CO_2 laser cutting. Four cutting methods, laser cutting with nitrogen jet assistance, with oxygen jet assistance, mill cutting and shears cutting, were investigated. The results indicated that: (1) CO_2 laser cutting with nitrogen jet assistance can provide a better squareness, its cutting quality meets the requirement that butt gap for the edges must be less than 0.1 mm. Because the HAZ is smaller for CO_2 laser cutting with nitrogen jet assistance, there is not macroscopic resident distortion for the cut sheet. (2) CO_2 laser cutting with nitrogen jet assistance with high speed and good cutting quality is suitable for cutting preparation for tailored welded blank manufacturing.