Testing Methodology to Characterize GMA Welds for use in FEA Simulation******

汽车生产商希望在气体保护焊(GMAW)框架应用中增加先进的高强度钢(AHSS)的使用。这将允许用比目前使用的更薄的钢规来制造零件，减轻零件重量，提高车辆的燃油经济性，同时保持或提高车辆的安全性。然而，当AHSS是GMAW时，由于其复杂的化学成分和微观结构，许多AHSS表现出不同的性能，表现出高和低硬度的局部区域。这种硬度变化会导致强度测试期间结果的变化，因此这些数据不能用于零件设计所需的数值模拟模型。*本项目将开发一种测试方法来表征搭接剪切接头的拉伸焊接强度，该方法可用作设计汽车零件所需模型的输入。该方法的设计将使其可以使用行业可用的标准测试方法来实施。测试方法将通过增加测试接头的对称性来改进，然后通过将测试结果与采用对接配置的焊缝(理想情况下)以及使用仪表化硬度测试数据计算的热影响区不同区域的局部应力-应变数据进行比较来验证测试方法。*实施本项目的结果是将重型(2 Mm)AHSS集成到框架应用程序中的第一步。在车架应用中越来越多地使用AHSS将允许在汽车设计中使用更薄的材料，减轻车辆重量并减少其对环境的影响。这将通过以下方式使加拿大受益：减少新汽车的环境足迹，向Martinrea等加拿大公司提供制造技术，以生产新牌号的钢材，并为Stelco和ArcelorMittal Dofasco等加拿大钢铁制造商销售其新的AHSS牌号提供市场。

Automotive producers would like to increase use of advanced high strength steel (AHSS) in gas metal arc welded (GMAW) frame applications. This would allow parts to be made from thinner gauges of steel than are currently used, reducing part weight, and improving vehicle fuel economy, while maintaining or increasing vehicle safety. However, when AHSS are GMAW, many AHSS exhibit heterogeneous properties exhibiting local areas of high and low hardness due to their complex chemical composition and microstructures. This hardness variation leads to variations in results during strength testing so that the data cannot be used to inform numerical simulation models needed for part design.****This project will develop a testing methodology to characterize the tensile weld strength of lap shear joints, which may be used as input for the models needed to design automotive parts. The method will be designed so that it may be implemented using standard testing methods available to industry. The test method will be improved by increasing the symmetry of the tested joint, and then validated by comparing test results to welds made in a butt joint configuration, which is the ideal case, and local stress-strain data from various areas of the HAZ, calculated using instrumented hardness test data.****Implementing the results of this project is the first step to integrating heavy (>2 mm) AHSS into frame applications. Increasing use of AHSS in frame application will allow thinner materials to be used for automotive designs decreasing vehicle weight and reducing their environmental impact. This will benefit Canada by: reducing the environmental footprint of new vehicles, providing manufacturing know-how to Canadian companies, such as Martinrea, to manufacture new grades of steel, and provide a market for Canadian steelmakers such as Stelco and ArcelorMittal Dofasco to sell their new AHSS grades.