Resistance Element Welding of Carbon Fiber Reinforced Thermoplastic Composites to High-Strength Steel

doi:10.16183/j.cnki.jsjtu.2021.271

Abstract

Abstract:

The high strength joining of carbon fiber reinforced nylon 6 composites (CF/PA6) to TWIP980 steel was achieved by resistance element welding (REW). A 304 stainless steel rivet was used as an assistant element. The effect of welding current and welding time on the joint mechanical property was studied. Four joint failure modes with different strengths were identified, and the microstructures of joints, and the interfaces between CF/PA6 and the steel were analyzed. As the melting point and thermal conductivity of CF/PA6 are lower than those of the high-strength steel, it is prone to overheat and decompose during welding. While ensuring the formation of a certain size of weld nugget, avoiding or reducing the decomposition of CF/PA6 is the key to the successful implementation of CF/PA6 high-strength steel REW. By using a hard welding process such as high welding current and short welding time, high strength joints can be obtained while reducing the decomposition of CF/PA6. Based on the failure load of the joint, the weld lobe under the conditions of this study was determined. The process is sensitive to the change of welding time, and the allowable welding time range is narrow. The decomposition of CF/PA6 cannot be avoided completely even when the welding parameters in the weld lobe are employed. Therefore, it is necessary to conduct further research on the temperature field and the nugget formation mechanism of the REW process.

Key words: carbon fiber reinforced thermoplastic composites, twinning induced plasticity steel, resistance element welding, microstructures, mechanical properties

CLC Number:

TG453.9

WANG Yecheng, LI Yang, ZHANG Di, YANG Yue, LUO Zhen. Resistance Element Welding of Carbon Fiber Reinforced Thermoplastic Composites to High-Strength Steel[J]. Journal of Shanghai Jiao Tong University, 2022, 56(10): 1349-1358.

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材料	w (C)	w (Si)	w (Mn)	w (Al)	w (Cr)	w (Ni)	w (S)	w (P)	w (Fe)
TWIP980	0.60	0.20	18.0	1.50	-	-	0.0021	0.015	余量
304不锈钢	≤0.08	≤1.00	≤2.00	-	17.00~19.00	8.00~11.00	≤0.03	0.035	余量

材料	拉伸强度/MPa	屈服强度/MPa	伸长率/%	玻璃转化温度/℃	热变形温度/℃	熔点/℃	热分解温度/℃	热导率/ (W·m^-1·K^-1)
TWIP980	995	476	65.0	-	-	约1400	-	约20
304不锈钢	≥600	≥300	40.0	-	-	1400~1450	-	16.3
CF/PA6	270	-	1.0	70	245	260	340	0.4

序号	焊接电流 I/kA	焊接时间 t/ms	平均失效载荷F/kN	标准方差 δ/kN	断裂模式	序号	焊接电流 I/kA	焊接时间 t/ms	平均失效载荷F/kN	标准方差 δ/kN	断裂模式
1	8	40	3.02	2.76	界面断裂	13	10	70	5.10	0.58	母材断裂
2	8	50	4.92	0.79	界面断裂	14	12	20	0.54	0.93	界面断裂
3	8	60	5.39	0.58	界面断裂	15	12	30	5.25	0.87	界面断裂
4	8	70	5.58	0.96	部分纽扣断裂	16	12	40	5.14	0.91	界面断裂
5	8	80	5.52	0.79	部分纽扣断裂	17	12	50	5.67	0.33	母材断裂
6	8	90	5.80	0.53	部分纽扣断裂	18	12	60	2.59	2.13	脆性断裂
7	8	100	4.77	1.46	部分纽扣断裂	19	14	20	3.07	1.07	界面断裂
8	8	110	1.95	3.38	脆性断裂	20	14	30	5.17	1.03	部分纽扣断裂
9	10	30	4.30	0.33	界面断裂	21	14	40	5.07	0.22	部分纽扣断裂
10	10	40	5.34	0.33	界面断裂	22	16	20	3.59	0.83	界面断裂
11	10	50	5.71	0.35	母材断裂	23	16	30	5.52	0.66	母材断裂
12	10	60	5.86	0.52	母材断裂	24	16	40	3.31	2.69	脆性断裂