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首页> 外文会议>IMECE2008;ASME international mechanical engineering congress and exposition >RESISTANCE SPOT WELDING (RSW) PROCESS OPTIMIZATION FOR UNCOATED 2.0 MM DUAL PHASE 780 TO 2.0 MM UNCOATED 2.0MM DUAL PHASE 780 (DP780) STEEL FOR AUTOMOTIVE APPLICATIONS
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RESISTANCE SPOT WELDING (RSW) PROCESS OPTIMIZATION FOR UNCOATED 2.0 MM DUAL PHASE 780 TO 2.0 MM UNCOATED 2.0MM DUAL PHASE 780 (DP780) STEEL FOR AUTOMOTIVE APPLICATIONS

机译：适用于汽车应用的2.0 mm未定型双相780至2.0 MM未定型的2.0mm双相780（DP780）钢的电阻点焊（RSW）工艺优化

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There has been a substantial increase in the use of advanced high strength steel in automotive structures in the last few years. The usage of these materials is projected to grow significantly in the next 5-10 years with new safety and fuel economy regulations. Advanced High Strength Steels (AHSS) are getting popular with superior mechanical properties and weight advantages compared to mild steel materials. These new materials have significant manufacturing challenges, particularly for welding and stamping. Proper understanding of the weldability of these materials is critical for successful application in future vehicle programs. Due to high strength nature of AHSS materials, higher weld forces and longer weld times are needed to weld AHSS materials. This work is in support of lightweight structures development and during the weld development phase various gages of coated and uncoated AHSS materials (DP780, DP980, TRIP780, Boron, Algoma 700B) were investigated. Both 2T and 3T stack-up conditions were investigated. Also, some combination of AHSS materials with High Strength Low Alloy (HSLA) and Bake Hardenable 210 (BH210) electro galvanized (EG) steels were also investigated. In this paper, weld lobe development for 2.0 mm DP780 bare to 2.0 mm DP780 bare 2T stack-up combination is discussed. Weld lobes were developed with Mid Frequency Direct Current (MFDC) equipment, ISO type B-20 tip, constant weld force of 6.36 kN (1430 lbf), hold time of 5 cycles and the weld times were varied 21, 24 and 27 cycles. Based on the tensile, cross-tension and nugget data, there were no correlations were observed between tensile load and button size and also between cross-tension and button size. Weld crosssection data indicated heat affected zone (HAZ) at the weld nugget area and hardness drop of 17% was observed at the HAZ area. Irrespective of weld cycles, similar HAZ was observed close to the weld nugget. The weld lobes, mechanical properties (tensile shear and cross tension), cross-section examination, and microhardness of 2.0 mm DP780 bare to 2.0 mm DP780 bare weld 2T stack-up results are discussed.
机译：过去几年中，汽车结构中高级高强度钢的使用已大大增加。随着新的安全性和燃油经济性法规，这些材料的使用量预计将在未来5-10年内显着增长。与低碳钢材料相比，高级高强度钢（AHSS）具有出色的机械性能和重量优势，因此受到欢迎。这些新材料在制造方面存在重大挑战，尤其是在焊接和冲压方面。正确理解这些材料的可焊性对于在未来的车辆计划中成功应用至关重要。由于AHSS材料的高强度特性，需要更高的焊接力和更长的焊接时间来焊接AHSS材料。这项工作是为了支持轻型结构的开发，在焊接开发阶段，对各种带涂层和未带涂层的AHSS材料（DP780，DP980，TRIP780，硼，Algoma 700B）进行了测量。研究了2T和3T的堆积条件。此外，还研究了AHSS材料与高强度低合金（HSLA）和可烘烤硬化210（BH210）电镀锌（EG）钢的某种组合。在本文中，讨论了从2.0 mm DP780裸露到2.0 mm DP780裸露2T堆叠组合的焊缝发展。焊接凸角是使用中频直流（MFDC）设备，ISO B-20型烙铁头开发的，恒定焊接力为6.36 kN（1430 lbf），保持时间为5个循环，焊接时间分别为21、24和27个循环。基于拉伸，横向张力和块状数据，在拉伸载荷与纽扣尺寸之间以及横向张力与纽扣尺寸之间均未观察到相关性。焊接十字 截面数据表明，在焊核区域有热影响区（HAZ），在HAZ区域观察到硬度下降了17％。无论焊接周期如何，在焊核附近都观察到类似的热影响区。讨论了焊缝，机械性能（拉伸剪切和横向拉伸），横截面检查以及2.0 mm DP780裸露至2.0 mm DP780裸焊缝2T堆积结果的显微硬度。

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