1. 焊缝收缩率扭节：knuckling 焊缝收缩率焊接疤扭扭节 | knuckling 焊缝收缩率扭节 | knuckling 焊接疤钮
2. 扭节：knuckling 焊接疤钮 | knuckling 扭节 | knurl 在......上滚花
3. 焊接疤钮：knuckling 焊缝收缩率扭节 | knuckling 焊接疤钮 | knuckling 扭节
4. 焊缝收缩率焊接疤扭扭节：knucklethread 圆螺纹 | knuckling 焊缝收缩率焊接疤扭扭节 | knuckling 焊缝收缩率扭节