The article introduces self developed four axis NC trace welding machine at first,deals in details with the special on line programming technique using three axis measurer in the machine.

• 介绍自行研制的四坐标数控连续轨迹焊接机，重点阐述该设备在对结构件直角型焊缝轨迹焊接时，数控程序实用独特的自动在线生成方法，即数控三坐标测量头在线编程技术。