Resistance Spot Welding and Laser Spiral Spot Welding Processes for Q235 Steel with Phosphide Coating

XU Ping, CHEN Ming, WANG Chongrui, ZHOU Aobo, GUO Tao, XIE Dianbao, FAN Donghui

Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (7) : 96-101.

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (7) : 96-101. DOI: 10.3969/j.issn.1674-6457.2025.07.011
Iron and Steel Forming

Resistance Spot Welding and Laser Spiral Spot Welding Processes for Q235 Steel with Phosphide Coating

  • XU Ping1,2, CHEN Ming1, WANG Chongrui1, ZHOU Aobo1,2, GUO Tao1,2, XIE Dianbao1, FAN Donghui1,2,*
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Abstract

The work aims to investigate the effects of resistance spot welding and laser spiral spot welding on the microstructure and mechanical properties of Q235 steel with phosphide coatings. Two different welding technologies of resistance spot welding and laser spiral spot welding were used to conduct spot welding tests on Q235 steel specimens with phosphide coatings. Then, the appearance, microstructure, microhardness, and shear strength of the two types of spot welding joints were compared. Based on this, the process and mechanical properties of laser spiral spot welding joints under different test piece spacing were studied. The laser spiral spot welding process had better adaptability to working conditions. The melting situation of the laser spiral spot welding joint test piece was better than that of the resistance spot welding, and it had a higher shear strength. However, resistance spot welding joints had higher microhardness, which could reach up to about 350HV. The spacing of laser spiral spot welding had a significant impact on the mechanical properties of the welding joint. As the spacing increased, the microhardness improved which could reach up to 240HV. Appropriately increasing the spacing was also beneficial to improving the maximum tensile force, which could reach 15.27 kN. The fracture mode of the laser spiral spot welding joint was tear-out, while that of the resistance spot welding joint was pull-out. The maximum tensile strength of the laser spiral spot welding was greater than that of the resistance spot welding. By comparing the two welding processes, it is known that the tensile and shear performance of laser spiral spot welding is better than that of resistance spot welding, and the process adaptability is better, but the resistance spot welding joint has higher microhardness.

Key words

Q235 steel with phosphide coatings / resistance spot welding / laser spiral welding / microstructure / mechanical properties

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XU Ping, CHEN Ming, WANG Chongrui, ZHOU Aobo, GUO Tao, XIE Dianbao, FAN Donghui. Resistance Spot Welding and Laser Spiral Spot Welding Processes for Q235 Steel with Phosphide Coating[J]. Journal of Netshape Forming Engineering. 2025, 17(7): 96-101 https://doi.org/10.3969/j.issn.1674-6457.2025.07.011

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