高韧性铝硅镀层热成形钢电阻点焊性能研究

doi:10.19562/j.chinasae.qcgc.2025.02.017

Abstract

Abstract:

Al-Si coated press hardening steels （PHS） with coating thicknesses ranging from 8 to 18 μm demonstrate enhanced toughness， drawing significant attention from the industry. However， there is limited evaluation of the resistance spot welding performance of Al-Si coated PHS with reduced coating thickness. This research compares the weldability of PHS with thin Al-Si coatings at strengths of 1 000， 1 500， and 2 000 MPa. The results show that the weldability current range and mechanical properties of welds for all three grades of PHS meet industrial production requirements. Further analysis reveals that the mechanical properties of the welds are closely linked to the strength and toughness of the martensite in the nugget. As the matrix strength increases， the strength （hardness） of the martensite in the nugget also rises， while toughness decreases. Consequently， the tensile-shear ultimate load increases with rising weld strength， whereas the cross-tensile ultimate load decreases as weld toughness diminishes.

Key words: Al-Si coating, PHS, resistance spot welding, welding lobe, microstructure and properties

Zhengxian Li,Fei Cheng,Yilin Chen,Dapeng Yang,Hongliang Yi. Study on Resistance Spot Welding Performance of Al-Si Coated Press Hardening Steels with High Toughness[J].Automotive Engineering, 2025, 47(2): 367-375.

Figures/Tables 18

References 22

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钢号	成分/%
钢号	C	Mn	Si	Ti	Cr	V	B	Al	Fe
P10	0.06	1.2	0.21	0.03	0.20		0.003		Bal
P15	0.22	1.2	0.22	0.04	0.18		0.003		Bal
P20	0.33	1.1	0.25		0.20	0.15	0.003	0.4	Bal

钢号	硬度/HV0.3
钢号	基材	上临界热影响区	临界热影响区	亚临界热影响区域	熔核区
P10	372±10	365±8	305±33	389±10	370±11
P15	473±8	459±13	353±33	484±25	471±17
P20	570±6	556±8	425±35	584±17	571±8

Study on Resistance Spot Welding Performance of Al-Si Coated Press Hardening Steels with High Toughness

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