PPS/CF复合材料电阻焊接工艺及性能评价

Study on resistance welding process of PPS/CF composite

关键词:  热塑性复合材料|碳纤维|电阻焊接|抗剪强度

Key words:  thermoplastic composite|carbon fiber|resistance welding|shear strength

摘要:

利用碳纤维织物电阻产热特性对PPS/CF层合板开展电阻焊接工艺研究. 试验验证了碳纤维电阻随温度升高而减小的变化规律，从而阐明了碳纤维通电发热非线性增长的原因. 通过DSC测试获得PPS熔融态温度区间，利用LSCM对接头微观形貌进行分析，结合接头的LSS试验结果，得到了PPS/CF层合板电阻焊接的主要焊接工艺参数(焊接温度、焊接压力和冷却速率)及其对接头成形和力学性能的影响规律. 结果表明，优化后的工艺参数为焊接温度390 ℃、焊接压力0.6 MPa、冷却速率20 ℃/min，此时的焊接接头抗剪强度最高，可达到母材自身抗剪强度的65%.

Abstract:

Using the heat production characteristics of carbon fiber fabrics to study the electrical welding process of PPS/CF laminates. The test proves that the carbon fiber resistance decreases with the increase of the temperature, and the carbon fiber heats up. The reason for the increase in nonlinearity. By the DSC test, the PPS melting temperature range was obtained. The micro-morphology of the joint was analyzed by LSCM. The LSS test of the joint was obtained. The main welding process parameters of the resistance welding of the PPS/CF laminate were obtained. (Welding temperature, welding pressure and cooling rate) and its influence on the joint forming and mechanical properties. The results show that the optimized process parameters are welding temperature 390 °C, welding pressure 0.6 MPa, and cooling rate 20 °C/min. At this time, the welded joint has the highest shear strength, which can reach the base material's own shear strength 65%.