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首页> 外文会议>International Symposium on Impact Engineering >Welding Current Dependence of Dynamic Mechanical Properties for Spot-Welded Electric Arc Furnace Steel Sheet
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Welding Current Dependence of Dynamic Mechanical Properties for Spot-Welded Electric Arc Furnace Steel Sheet

机译：焊接电弧炉钢板动态力学性能的焊接电流依赖性

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In 2012, a novel production line was developed to produce electric arc furnace steel sheet for automotive structure, as a national project in Japan. From the viewpoint of crashworthiness, the evaluation of joint strength under dynamic loading is essential. In this study, single-lap spot-welded joint specimens are prepared with the variation of welding current. The specimen sheet is 980-MPa grade electric arc furnace steel and 1.0 mm in thickness, which is supplied by Tokyo Steel Co., Ltd.Nugget diameter d is recommended by a well-known empirical equation, d = 5 t , where t' is sheet thickness. The nugget diameter can be adjusted mainly by welding current. In order to find the optimum nugget diameter under dynamic tensile-shear, five values of welding current, 6.1, 6.4, 6.7, 7.0 and 7.3 kA are tried. The values are set for the recommended nugget diameter 5.00 mm, and ±5% and +10% of the recommended diameter. Experimental results of quasi-static (loading velocity: 2.0 mm/min = 3.3×10~(-5) m/s) and dynamic (initial loading velocity: 7 m/s) tensile-shear tests shows that, despite of loading velocity and welding current (equivalent to nugget diameter), tensile-shear strengths are almost constant. Absorbed energies up to the strength give complicated tendencies. At the recommended welding current (equivalent to d = 5.00mm), the most stable strengths and energies are obtained.
机译：在2012年，一个新的生产线研制生产电弧炉钢板汽车结构，在日本国家项目。从碰撞安全性的角度来看，接头强度下动态加载的评价是至关重要的。在这项研究中，单圈点焊接头标本与焊接电流的变化来制备。试样片是980 MPa级电弧炉炼钢和1.0毫米的厚度，这是由东京钢Co.提供，Ltd.Nugget直径d由公知的经验方程建议，d = 5吨，其中t”是板厚。熔核直径可以主要由焊接电流进行调整。为了找到在动态拉伸剪切最佳熔核直径，焊接电流，6.1，6.4，6.7，7.0和7.3千安的五个值被尝试。值被设定为推荐的熔核直径5.00毫米，和推荐的直径的±5％和±10％。准静态的实验结果（装载速度：2.0毫米/分钟= 3.3×10〜（-5）米/秒）和动态（初始装载速度：7米/秒）拉伸剪切试验表明，尽管加载速度的和焊接电流（相当于熔核直径），拉伸剪切强度是几乎恒定。吸收能量高达实力给予复杂的倾向。在推荐的焊接电流（相当于d =5.00毫米），得到最稳定的强度和能量。

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