The studied results show that the radial dimension of keyhole increases with laser power for partial penetration, while it is nearly unvaried when the workpiece is fully penetrated.

• 研究结果表明，小孔径向尺寸在工件未焊透时随激光功率的增大而增大,在焊透时小孔径向尺寸随激光功率的变化较小；