利用错边试样的激光焊接实验来研究小孔行为对等离子体光、声辐射信号的影响。发现等离子体光辐射强度仅受被焊材料蒸发量的影响。而等离子体声信号的强度以及光、声信号的频谱分布都受到小孔行为的制约。在不能出现小孔的情况下，等离子体失去了周期性行为。 Laser welding experiments with wrong-side samples were used to study the effects of pinhole behavior on plasma light and acoustic radiation signals. It is found that the intensity of the plasma optical radiation is only affected by the amount of evaporation of the material to be welded. However, the intensity of the plasma acoustic signal and the spectral distribution of the light and the acoustic signal are all restricted by the behavior of the pinhole. In the absence of small holes, the plasma loses its periodic behavior.