相关实验视频

Updated: Sep 11, 2025

Generating Lap Joints Via Friction Stir Spot Welding on DP780 Steel

Generating Lap Joints Via Friction Stir Spot Welding on DP780 Steel

Published on: August 13, 2019

影响先进高强度钢的阻力点接接质量的因素

Vahid Feizollahi¹, Ali Bahmani¹, Nima Nadimi²

¹School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran.

Scientific reports

|August 16, 2025

概括

涂层通过改变热量产生和颗粒形成,显著影响先进高强度钢的阻力点接. 涂层钢需要更高的电流,从而产生更大的颗粒,但与未涂层钢相比,拉力剪切强度较低.

科学领域:

材料科学材料科学材料科学
制造业工程制造工程
金工业是金工业的一个方面.

背景情况:

先进的高强度钢,特别是火和分区 (QP) 等级,在汽车制造中对于轻量化至关重要.
电阻点接是汽车白色车身结构的主要连接方法.
涂层在汽车应用中使用的钢板上普遍存在,影响接能力.

研究的目的:

为了研究涂层对接质量在QP980钢的电阻点的影响.
分析涂层对颗粒形成,生长,宏观结构,机械性能和断裂行为的影响.
为了确定涂层存在,工艺参数和接性能之间的相关性.

主要方法:

阻力点试验是在未涂层和涂的QP980钢板上进行的.
接质量通过分析颗粒形成,宏观结构特征和接能力范围 (叶片曲线) 来评估.
评估了机械性能 (硬度,抗拉力强度) 和断裂模式.

主要成果:

涂层降低了电气接触电阻,将主要的热量产生从接触转移到散装电阻.
涂层钢需要更高的接电流来形成颗粒,在类似的条件下会产生更大的颗粒.
没有涂层的样本比涂层的样本表现出更高的融合区硬度和拉伸切割强度 (28 kN vs. 24 kN).

结论:

涂层显著改变了颗粒形成机制,需要调整接参数.
在促进更大的颗粒的同时,涂层可以降低接的最终拉力剪切强度.
了解涂层,工艺参数和颗粒属性之间的相互作用对于预测涂QP980钢点的机械性能和故障模式至关重要.

关键词:

这就是 AHSS 的原因.涂层效应涂层效应是一种涂层效应.失效模式失效模式多脉冲接多脉冲接的方法块的形成和生长机制.在QP980钢铁中.接质量接质量

更多相关视频

Ultrasonic Welding of Thermoplastic Composite Coupons for Mechanical Characterization of Welded Joints through Single Lap Shear Testing

Ultrasonic Welding of Thermoplastic Composite Coupons for Mechanical Characterization of Welded Joints through Single Lap Shear Testing

Published on: February 11, 2016

Surrogate Model Development for Digital Experiments in Welding

Surrogate Model Development for Digital Experiments in Welding

Published on: March 28, 2025

相关概念视频

Residual Stresses

Residual Stresses

Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...

Steel Fastening Techniques

Steel Fastening Techniques

Steel sections can be joined together through various fastening techniques including riveting, bolting, and welding, each suitable for different structural requirements and conditions.
Rivets are cylindrical steel fasteners with a specially designed head. During application, rivets are heated until white-hot and then inserted through pre-drilled holes in the steel sections. A pneumatic hammer is used to shape the exposed end into a second head, securing the sections together.
Bolting is another...

Mechanical Characteristics of Steel

Mechanical Characteristics of Steel

The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...

Corrosion of Reinforcement

Corrosion of Reinforcement

The corrosion of steel reinforcement within concrete is a process influenced by the material's inherent properties and external factors. The high pH level of around 13, provided by calcium hydroxide present in concrete, initially protects the steel reinforcement by promoting the formation of a passive iron oxide layer on its surface.
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...

Stress Concentrations

Stress Concentrations

Stress concentration is when stress intensifies near discontinuities such as holes or abrupt cross-sectional changes in a structural member. This localized stress can often surpass the average stress within the member. The stress distribution in flat bars, either with a circular hole or varying widths connected by fillets, can be determined experimentally using a photoelastic method. The results are based on ratios of geometric parameters like the ratio of the hole's radius to the smaller...

Factors Affecting Workability

Factors Affecting Workability

The workability of concrete is a critical characteristic that influences the ease of mixing, handling, and finishing the concrete. It is affected by several factors including water content, aggregate properties, and admixtures like air entrainment. Water plays a fundamental role as it lubricates the concrete mix, facilitating easier movement and placement. However, the water requirement varies depending on the texture and shape of aggregates. Finer particles and angular, rough-textured...