高强度低合金钢双电阻点焊失效分析

Q3 Engineering

Journal of Applied Engineering Science Pub Date : 2023-03-06 DOI:10.5937/jaes0-40923

Hayder Al-Bayati, I. Mahmood, F. Khoshnaw

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引用次数: 0

摘要

高强度低合金钢(HSLA DOCOL 500 LA)被用于汽车结构，因为它具有优异的品质，如良好的抗疲劳性，高强度重量比，有助于减轻车辆重量，提高燃油效率和降低二氧化碳排放。电阻点焊(RSW)是汽车零部件连接中应用最广泛的焊接技术。研究了高强度钢的RSW工艺。采用田口法，对以焊接电流、焊接时间和电极力为主要焊接参数的双点焊块进行优化。最佳焊接电流为8800Amp，焊接时间为30个循环，电极力为2560n。在最大载荷为1500 N时进行了疲劳试验，获得了疲劳极限，并进行了力学和显微组织试验，研究了失效模式，疲劳试验过程中出现了两种失效类型:完全拔出失效和核块区周围裂纹。

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ANALYSIS OF DOUBLE RESISTANCE SPOT WELDING'S FAILURE IN HIGH STRENGTH LOW ALLOY STEEL

High strength low alloy steel (HSLA DOCOL 500 LA) is utilized in the automotive structure because of its superior qualities such as good fatigue resistance, a high strength-to-weight ratio, assisting in reducing the weight of the vehicle, increasing fuel efficiency and lower CO2 emissions. Resistance Spot Welding (RSW) is the most welding technique that is used to join automobile parts together. This study investigated the RSW process for high-strength steel. By utilizing the Taguchi approach, the optimization process for double spot nuggets with the principal welding parameters of welding current, welding time, and electrode force was carried out. The values of optimum parameters were 8800Amp for welding current, welding time of 30 cycles and 2560 N for electrode force. Mechanical and microstructure tests were carried out to study the failure modes while the fatigue test was achieved to obtain the fatigue endurance limit and it was at a maximum load 1500 N and during the fatigue test two types of failure happened: full pull-out failure and cracks around the nugget zone.

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来源期刊

Journal of Applied Engineering Science Engineering-Engineering (all)

CiteScore

2.00

自引率

0.00%

发文量

122

审稿时长

12 weeks

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