Study on resistance welding process of PPS/CF composite
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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%.
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Keywords:
- thermoplastic composite /
- carbon fiber /
- resistance welding /
- shear strength
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图 4 碳纤维织物电流强度、电阻率和温度的关系
Figure 4. Relationship of current intensity and resistivity with temperature
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图 6 不同焊接温度PPS/CF层合板焊接接头的抗剪强度
Figure 6. Shear strength of PPS/CF laminate joints with different welding temperature
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图 7 PPS/CF层合板不同焊接温度接头剪切断口的宏观形貌
Figure 7. Profiles of shear fracture of PPS/CF laminates with different welding temperature. (a) profiles of shear fracture at 360 °C；(b) profiles of shear fracture at 390 °C；(c) profiles of shear fracture at 420 °C
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图 8 PPS/CF层合板不同焊接温度接头横截面的微观形貌
Figure 8. Microscopic profiles of PPS/CF welding joints cross section with different temperature. (a) microscopic profiles at 360 °C;(b) microscopic profiles at 390 °C;(c) microscopic profiles at 420 °C
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图 9 PPS/CF层合板不同焊接压力接头的宏观形貌
Figure 9. Profiles of PPS/CF laminate joints with different welding pressures. (a) profiles at 0.4 MPa;(b) profiles at 0.6 MPa; (c) profiles at 0.8 MPa
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图 10 PPS/CF层合板不同焊接压力接头横截面的微观形貌
Figure 10. Microscopic profiles of PPS/CF welding joints cross section with different pressures. (a) microscopic profiles at 0.4 MPa; (b) microscopic profiles at 0.6 MPa; (c) microscopic profiles at 0.8 MPa
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图 11 不同焊接压力PPS/CF层合板焊接接头的抗剪强度
Figure 11. Shear strength of PPS/CF laminate joints with different welding pressures
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图 12 不同冷却速率PPS/CF层合板焊接接头的抗剪强度
Figure 12. Shear strength of PPS/CF laminate joints with different cooling rate
表 1 PPS/CF层合板热压成形参数
Table 1 Parameters of hot pressure shaping for PPS/CF laminate
温度 T/℃ 排气压力 P1/MPa 排气时间t1/s 成形压力
Pr/MPa成形时间t2/s 310 2 1 6 1 800 
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