Study on Spot Welding Process and Joint Properties of Hot Dip Galvanized Dual Phase Steel HC420/780DPD+Z

WANG Yafen; ZHANG Jie; CHEN Hongyu

doi:10.7512/j.issn.1001-2303.2024.05.18

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Study on Spot Welding Process and Joint Properties of Hot Dip Galvanized Dual Phase Steel HC420/780DPD+Z
Vol. 54, Issue 5, Pages: 124-129(2024)
Published： 25 May 2024 ，
DOI： 10.7512/j.issn.1001-2303.2024.05.18

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王亚芬，张杰，陈虹宇.热镀锌双相钢HC420/780DPD+Z电阻点焊工艺与性能研究［J］.电焊机，2024，54（5）：124-129.

WANG Yafen, ZHANG Jie, CHEN Hongyu.Study on Spot Welding Process and Joint Properties of Hot Dip Galvanized Dual Phase Steel HC420 / 780DPD+Z[J].Electric Welding Machine, 2024, 54(5): 124-129.
王亚芬，张杰，陈虹宇.热镀锌双相钢HC420/780DPD+Z电阻点焊工艺与性能研究［J］.电焊机，2024，54（5）：124-129. DOI： 10.7512/j.issn.1001-2303.2024.05.18.

WANG Yafen, ZHANG Jie, CHEN Hongyu.Study on Spot Welding Process and Joint Properties of Hot Dip Galvanized Dual Phase Steel HC420 / 780DPD+Z[J].Electric Welding Machine, 2024, 54(5): 124-129. DOI： 10.7512/j.issn.1001-2303.2024.05.18.

摘要

为获得1.5 mm厚的汽车用热镀锌双相钢HC420/780DPD+Z的电阻点焊工艺窗口，采用中频逆变式电阻点焊机对其进行点焊试验，通过电极压力等参数调整，获得由不同焊接时间、焊接电流等组成的焊接工艺窗口。并通过显微硬度测试、剪切拉伸、十字拉伸试验以及金相检测等方法，对点焊接头性能进行综合评价。研究结果表明，在焊接时间为410~430 ms时，焊接电流工艺窗口为3.4~3.6 kA，可获得无缩孔、裂纹的焊接接头；接头的平均抗剪力为14.88 kN，平均十字拉伸力为7.1 kN；熔核区的显微硬度为402~455 HV，热影响区硬度为237 HV，未见脆化现象；电极寿命大于500个焊点，均满足GWS-5A标准要求。在此工艺下，接头的力学性能优异，显微组织主要为马氏体，硬度分布规律表明熔核区硬度最高。此外，焊接接头的失效模式主要为界面断裂和纽扣型熔核断裂，其中纽扣型熔核断裂具有更高的承载能力和能量吸收能力。

Abstract

To acquire the resistance spot welding process window for automotive hot-dip galvanized dual-phase steel

spot welding experiments were performed on 1.5 mm thick HC420/780DPD+Z using a medium-frequency inverter resistance spot welding machine. By adjusting parameters such as electrode pressure

a welding process window consisting of various welding times and currents was established. The performance of the spot-welded joints was comprehensively assessed through microhardness testing

shear and cross-tensile tests

and metallographic examination. The research indicates that under the optimal welding process window with a welding time of 410~430 ms and a welding current of 3.4~3.6 kA

defect-free welded joints without shrinkage pores or cracks can be achieved. The average shear strength of the joints is 14.88 kN

and the average cross-tensile strength is 7.1 kN. The microhardness in the nugget zone ranges from 402~455 HV

while the hardness in the heat-affected zone is 237 HV

with no signs of embrittlement observed. The electrode life exceeds 500 weld points

meeting the requirements of the GWS-5A standard. With this process

the mechanical properties of the joints are superior

and the microstructure is primarily composed of martensite

with the hardness distribution indicating the highest hardness in the nugget zone. Additionally

the failure modes of the welded joints are predominantly interfacial fractures and button-type nugget fractures

the latter of which has greater load-bearing capacity and energy absorption capability.

关键词

热镀锌双相钢电阻点焊焊接工艺窗口力学性能断裂模式

Keywords

hot dip galvanized dual phase steelresistance spot weldingwelding process windowmechanical propertyfracture mode

references

张玉菊，陈颖，张广峻，等.工艺参数对1000 MPa 级高强度结构钢点焊接头组织与性能的影响［J］.焊接，2018（9），26-30．

ZHANG Y J，CHEN Y，ZHANG G J，et al. Effect of process parameters on microstructure and properties of spot welded joints of 1000MPa grade high strength steel structure［J］. Welding & Joining，2018（9），26-30．

Mayyas A T，Mayyas A R，Omar M. Sustainable lightweight vehicle design： a case study in eco-material selection for body-in-white［J］. Lightweight Composite Structure in Transport， 2016， 11：267-302.

龚涛，王辉，缪凯，林承江，等. 600 MPa级高Al冷轧双相钢点焊接头断裂方式［J］. 焊接技术， 2011（09）：13-16.

GONG T，WANG H，MIU K，et al. Research on fracture mode of spot welding joint of high Al cold rolled dual-phase steel in 600MPa level［J］. Welding Technique，2011（09）：13-16.

Feng Q B，Li Y B，Carlson B E，et al. Study of resistance spot weldability of a new stainless steel［J］. Science and Technology of Welding and Joining， 2019， 24（2）：101-111.

GWS-5A-2007，Global Welding Standard Test Procedures Resistance Spot Welding of Steel［S］.General Motors Corporation， 2011-4-23.

陈飞，李敬勇. 车用热成形钢板USIBOR1500P电阻点焊焊接工艺优化及接头组织与性能［J］. 热加工工艺. 2016（07），52-53.

CHEN F，LI J Y. Resistance Spot Welding Process Optimization and Microstructure and Performance of Joint of USIBOR1500P Hot Forming Steel Sheet［J］. Hot Working Technology， 2016（07）：52-53.

LIU C J，ZHENG X K，HE H Y，et al. Effect of work hardening on mechanical behavior of resistance spot welding joint during tension shear test［J］. Materials & Design，2016，100：188-197.

Hernandez B V H，Nayak S S，Zhou Y. Tempering of martensite in dualphase steels and its effects on softening behavior［J］. Metall Mater Trans A，2011，42：3115-3129.

Pouranvari M，Marashi S P H. Critical review of automotive steels spot welding：process，structure and properties［J］.Science and Technology of Welding and Joining，2013，18（5）：361-403.

贾松青，张永强，刘兴全，等. 高强热镀锌钢板锌层厚度对电阻点焊工艺的影响［J］. 电焊机，2014，44（5）：74-78.

JIA S Q，ZHANG Y Q，LIU X Q，et al. The influence of zinc layer thickness on resistance spot welding process of high-strength hot-dip galvanized steel sheet［J］. Electric Welding Machine， 2014，44（5）：74-78.

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