基于玻纤和碳纤增强的PA66热塑性材料，研究了夹紧力对焊接件的间隙、熔深和剪切强度的影响，分析了三者之间的联系，得出夹紧力在焊接试验中的重要性。进一步研究了焊接速度和功率对熔深和剪切强度的影响，从大量的试验数据和拟合曲线中得出熔深与剪切强度之间的关系。最后，讨论了线能量对熔深和剪切强度的影响。结果表明，工艺参数影响焊接件的间隙和熔深，从而使得剪切强度发生改变，研究焊接件的间隙和熔深的变化能很好地认识到工艺参数是如何影响剪切强度的。

The influence of clamp pressure on the gap, the depth of fusion and the lap-shear strength of weldments is studied based on PA66 thermoplastic materials reinforced with glass fiber and carbon fiber. The relation among the gap, the depth of fusion and the lap-shear strength is analyzed, from which the great importance of clamp pressure in the welding test can be seen. The effect of welding velocity and power on the depth of fusion and the lap-shear strength is then studied deeply. The connection between the depth of fusion and the lap-shear strength of weldments is obtained from a large number of experimental data and fitting curves. Finally, the influence of linear energy on the depth of fusion and the lap-shear strength of weldments is discussed. The results show that the process parameters affect the weldments gap and the depth of fusion, which results in the changes of the lap-shear strength. The study of the changes of the weldments gap and the depth of fusion can make it clear that how does the process parameters affect the lap-shear strength.