Name: generating lap joints via friction stir spot welding on dp780 steel
Uploaded: 2019-08-13T12:30:00
Description: Watch this Scientific Journal Video about Generating Lap Joints Via Friction Stir Spot Welding on DP780 Steel at JoVE.com

我们感谢中钢公司的杨博士提供的物质支持,并感谢MIRDC的王先生、王先生和洪先生为实验性FSSW提供的援助。这项研究得到了台湾高雄金属工业研究发展中心的支持。

1. 材料准备
注:将 1.6 mm 厚的 DP780 纸张加工成 40 mm x 125 mm 优惠券。FSSW 接头设计为用于机械测试的膝部剪切试样。在 RSW 标准 NF ISO 18278-2 之后,将两张 125 mm x 40 mm 的纸张与 35 mm x 40 mm 重叠连接在一起;2005. 几何设计多晶金刚石工具,锥形肩部截断。几何设计如图1a所示。销的直径为 5 mm;长度为2.5毫米,肩部宽度为10毫米。真正的工具销如图1b</stron...

<ol>
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在 FSSW 过程中,暴跌阶段是最重要的。如果针脚肩部产生足够的摩擦热来软化工件,销将断裂。刀具几何形状、旋转速度、驻点时间和刀具穿透深度26个参数的 FSSW 过程在确定接头完整性方面起着至关重要的作用。报道了TPD和刀具几何27对焊接性和接头性能有重要影响。
引脚的几何形状是圆柱形,Whorl,MX三长,火焰-三叶,A-斜,和重新旋转由TWI<sup cla...

摩擦搅拌焊接(FSW)首次报告于1991年在TWI,阿宾顿,英国1。2003 年,Piccini 和 Svoboda 确定了一种增强 FSW 优势的优越方法,称为摩擦搅拌点焊 (FSSW),用于商用汽车制造工艺2。FSSW 方法涉及创建无体积区域熔化的点圈接头。FSSW 使用的最重要发展是铝合金,因为铝合金在高温条件下的焊接过程中变形。第一个成功的例子是在汽车行业,其中FSSW被用于制造整个后门的马自达的RX-81,3,4。
同时,高强度钢是车身的主要材料,特别是双相钢。文献表明,使用FSSW生产的DP600可以具有与基础金属相同的特性,所有焊接区域具有相似的微观结构和硬度5。FSSW在搅拌区(SZ)、热力学影响区(TMAZ)的微观结构上使用DP钢的方法,以及DP590和DP600钢的失效模型,已经由一些研究人员进行了研究。他们观察到DP590和DP600钢在各种旋转速度6、7、8、9、10的微观结构(铁氧体、苯铁矿和马腾酸盐)的一致性上的差异。一些研究人员对DP780钢8、9进行了FSSW和RSW的比较研究。他们报告说,更长的连接时间和更高的刀具旋转速度导致所有跳转的粘合面积增加,从而导致剪切力升高,并将模式从界面转向拉出。他们还得出结论,FSSW的强度高于RSW。FSSW 过程包括 3 个步骤:暴跌、搅拌和回缩。第一步是将旋转工具销靠近膝关节的纸张并插入纸张中。FSSW 工艺中的旋转工具肩会产生摩擦热。在第二步中,热量可以软化纸张,便于将工具销插入纸张中,并留在材料中,将两个工件搅拌在一起,并在销区域周围混合。最后,从工具肩压压在工件上的压力可以增强粘合性。焊接过程结束后,销可以从钥匙孔中缩回。与 RSW 相比,FSSW 的好处是焊接温度更低、无飞溅,并且制造过程中更加稳定。
尽管各种研究人员报告了对先进高强度钢 (AHSS) 的 FSSW 的研究,但 DP590、DP600 和 DP780 的 FSSW 研究侧重于微结构以及使用各种工艺的机械和故障模型参数。在本研究中,考虑了DP780钢的FSSW。详细报道了FSSW工艺方案,并根据测得的微硬度对搅拌区、热力学影响区、热影响区以及基金属的个别硬度进行了评估。
随着汽车和航空航天行业对重量减轻的持续增长和需求的严格要求,汽车行业对 AHSS 和膝关节的兴趣日益浓厚。例如,传统的钢制车身的汽车,平均有2000多个点焊圈接头11。行业中使用的膝关节有3种常见的焊接工艺,包括电阻点焊、激光点焊和摩擦点焊12。减轻重量的一种方法是使用先进的高强度钢 (AHSS)。最流行的材料是双相和转化诱导的可塑性(TRIP)钢,它们越来越多地用于汽车行业13,14,15,16。由于汽车重量降低,由于油耗提高和碰撞能量吸收,汽车行业提高了强度标准,因此使用不同的材料和焊接工艺正成为一个重要问题。

<table>
	<tbody>
		<tr>
			<td>anvil</td>
			<td>MIRDC</td>
			<td></td>
			<td>made by MIRDC</td>
		</tr>
		<tr>
			<td>DP780</td>
			<td>China steel Corporation</td>
			<td>CSC DP780</td>
			<td></td>
		</tr>
		<tr>
			<td>stir spot welder machine</td>
			<td>MIRDC</td>
			<td></td>
			<td>made by MIRDC</td>
		</tr>
		<tr>
			<td>tool pin</td>
			<td>KINIK COMPANY</td>
			<td>DBN2B005B</td>
			<td></td>
		</tr>
	</tbody>
</table>

generating lap joints via friction stir spot welding on dp780 steel

摩擦搅拌点焊(FSSW)是摩擦搅拌焊接(FSW)的衍生物,是1991年发展起来的一种固态焊接技术。2003 年,汽车行业在汽车后门使用的铝合金领域得到了应用。摩擦搅拌点焊接主要用于铝合金,以创建圈关节。摩擦搅拌点焊的好处包括接近 80% 的熔融温度,与电阻点焊相比,可降低热变形焊缝,而不会溅起。摩擦搅拌点焊接包括 3 个步骤:跌跌、搅拌和回缩。在本研究中,包括高强度钢在内的其他材料也用于摩擦搅拌焊接方法,以形成接头。DP780 的传统焊接工艺涉及电阻点焊,是汽车行业中使用的几种高强度钢材料之一。本文采用DP780进行摩擦搅拌点焊,并测量了其微观结构和微硬度。微观结构资料表明,有细粒的聚变区,有带岛马腾的热效应区。微硬度结果表明,中心区与基金属相比,具有较大的硬度。全部数据表明,两相钢780中使用的摩擦搅拌点焊可以产生良好的圈接头。将来,摩擦搅拌点焊可用于工业制造工艺中的高强度钢焊接。

图 3中有一个图,表明摩擦搅拌点焊接过程由 3 个部分组成:跌接(图3e)、搅拌(图 3f)和缩回(图 3g)。在我们的研究中,可以生成焊点。穿透深度是评估的一个因素。在图6a中,FSSW在中心创建钥匙孔,为2张创建接头。钥匙孔的测量深度是从板顶部到钥匙孔底部表面(<strong ...

Watch this Scientific Journal Video about Generating Lap Joints Via Friction Stir Spot Welding on DP780 Steel at JoVE.com

Generating Lap Joints Via Friction Stir Spot Welding on DP780 Steel

在这里,我们提出了双相780钢的摩擦搅拌点焊(FSSW)协议。高速旋转的工具销产生摩擦产生热量以软化材料,然后,销柱插入 2 个片接头以创建膝关节。

通过 DP780 钢上的摩擦搅拌点焊生成圈接头

Friction stir spot welding (FSSW), a derivative of friction stir welding (FSW), is a solid-state welding technique that was developed in 1991. An industry ...

汽车行业的减重需求对圈接头和先进的高强度钢（AHSS）产生了越来越大的兴趣。然而，AHSS 点焊接头在工艺可靠性方面面临挑战。与电阻点焊相比，摩擦搅拌点焊接（FSSW）的好处是焊接温度较低，无溅，制造过程中稳定性强。演示程序将是程嘉平和徐浩，研究生从我实验室。在此过程期间，请佩戴护目镜和手套，以防止飞溅接触或热损伤。也站在引擎盖后面或挡板后面进行保护。使用摩擦搅拌焊机制造所有接头。使用嵌入式数据采集系统，在每次连接操作期间记录 z 轴力和穿透深度。将工具销旋转速度设置为 25，000 RPM，刀具销焊接时间为 4 秒，刀具销的速率为 0.5 毫米/秒，并插入纸张。优化操作员的参数。转速范围为 1，000 至 2，500 RPM。停留时间范围为 2 到 10 秒，暴跌速率可以是 0.1 至 0.5 毫米/秒。在焊接过程之前，确保没有杂质基材污染工件。用针织微纤维织物擦拭工作件的表面，以消除任何小颗粒。放置 DP 780 工作件并夹紧 35 毫米重叠的 tWo DP 780 纸张。将清洁的零件固定到铁锤上，以防止换档。确保销清洁，防止基材污染不纯。使用针织超细纤维织物擦拭工具销的表面。要用夹紧固定销，请先拧紧工具销。注意销夹紧步骤。确保销紧贴在机器中，以避免危险。旋转工具被一个非旋转夹紧环包围，通过施加夹紧力，在焊接之前和焊接过程中，工件彼此牢固地压住。确认不带夹环的高速旋转销松动。将工具销放置在机床上时，出于安全原因，确保刀具销在旋转过程中不会与夹具分离。工具销在一分钟内使用 10 到 100 RPM 的低旋转速率。速度可以在一分钟内从 100 RPM 加速到 1，000 RPM。将机器设置为转速为 3，000 RPM，停留时间为 4 秒，暴跌速率为 0.5 毫米/秒。校准焊接位置和真实产品。将销设置在搅拌点焊机中。销和工作件之间的间隙小于 5 厘米，用于校准接头位置。确认位置后，继续焊接过程。在高速旋转下使用工具开始焊接过程，将工具销插入工件中。工具肩触动工作部件，停止旋转，并缩回销。对于暴跌，首先打开搅拌按钮。当机器预热时，确认刀具销始终以 2，500 RPM 转速运行。确保工具销在转速为 2，500 RPM 时很好地夹紧。针脚在高速旋转下在工作件中俯冲，肩部以高角度接触工作件。当暴跌工具销继续在工作件中搅拌时，软化销的界面和材料从摩擦热中产生颗粒。当工具销的肩部与工作件的顶部接触时，停止该过程，因为工具销的高旋转会产生高温。必须穿戴确保操作安全的保护装置。在垂直方向上绘制工具销。步骤后，销在圈接头上创建钥匙孔焊接点。请注意，摩擦搅拌点焊缝在此步骤中停止。关闭机器电源。焊接完成后，从铁锤中拆下工件。观察样品有裂纹和缺乏融合。完成该步骤后，从夹紧环上拆下工具销。在文本协议中描述的机械性能评估之前，会观察和检查工具销的外观。摩擦搅拌点焊接在 DP 780 板材中心创建钥匙孔，为两张板材创建接头。从板顶到钥匙孔底部表面测量钥匙孔的停留深度。将显示居住深度测量值，其中设置值为 2 厘米，实际值为 1.92 到 1.98 厘米。此图像显示了 DP 780 纸张中焊接点的关键孔整体视图。分析区域包含四个部分，基础金属、热受影响的区域、热力学受影响的区域和搅拌区。对基础金属微观结构的分析表明，材料性能没有变化。受热影响区呈现马腾石岛。钥匙孔附近的热水瓶机械影响区的微观结构的特点是针状马腾石和细线子铁的混合物，而钥匙孔周围的搅拌区则揭示了细粒马腾石和孔隙度。AHSS焊圈接头摩擦搅拌点焊接潜力巨大。平均而言，传统的钢制车身汽车有2000多个点焊圈接头。按照此步骤，可对硬圈接头执行刀具销的材料和设计几何形状。较长的生命周期将是此过程的需求。

Research

JoVE Journal

Engineering

Micropunching Lithography for Generating Micro- and Submicron-patterns on Polymer Substrates

Micropunching为微型和亚微米模式聚合物基板上生成的光刻

Conducting polymers have attracted great attention since the discovery of high conductivity in doped polyacetylene in 19771. They offer the advantages of ...

科研

工程学

Mechanical Expansion of Steel Tubing as a Solution to Leaky Wellbores

钢管机械性扩张为解决井眼漏

Wellbore cement, a procedural component of wellbore completion operations, primarily provides zonal isolation and mechanical support of the metal pipe ...

Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes

互溶的测量准备和摩擦力显微镜，反对聚合物刷

Solvated polymer brushes are well known to lubricate high-pressure contacts, because they can sustain a positive normal load while maintaining low ...

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

通过单搭接剪切试验的热塑性复合材料优惠券焊接接头的力学特性的超声波焊接

This paper presents a novel straightforward method for ultrasonic welding of thermoplastic-composite coupons in optimum processing conditions. The ...

The Evolution of Silica Nanoparticle-polyester Coatings on Surfaces Exposed to Sunlight

表面上的纳米硅聚酯涂料暴露在阳光下的演变

Corrosion of metallic surfaces is prevalent in the environment and is of great concern in many areas, including the military, transport, aviation, ...

Preparation and High-temperature Anti-adhesion Behavior of a Slippery Surface on Stainless Steel

不锈钢滑面的制备及高温抗粘接性能研究

Anti-adhesion surfaces with high-temperature resistance have a wide application potential in electrosurgical instruments, engines, and pipelines. A ...

Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass (ADG) Fresnel Lens for Concentrating Photovoltaics

Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass ADG Fresnel Lens for Concentrating Photovoltaics

玻璃 (ADG) 菲涅耳透镜对聚光光伏的效率和辐照点的室内实验评价

We present a method to characterize achromatic Fresnel lenses for photovoltaic applications. The achromatic doublet on glass (ADG) Fresnel lens is ...

Preparation of Aligned Steel Fiber Reinforced Cementitious Composite and Its Flexural Behavior

定向钢纤维增强水泥基复合材料的制备及其弯曲性能研究

The aim of this work is to present an approach, inspired by the way in which a compass needle maintains a consistent orientation under the action of the ...

Applicability Analysis of Assessment Methods for Morphological Parameters of Corroded Steel Bars

钢筋形态参数评价方法的适用性分析

The irregular and uneven residual sections along the length of a corroded steel bar substantially change its mechanical properties and significantly ...

O-cresol Concentration Online Measurement Based On Near Infrared Spectroscopy Via Partial Least Square Regression

O-cresol 浓度在线测量基于近红外光谱通过部分最小平方回归

Unlike macroscopic process variables, near-infrared spectroscopy provides process information at the molecular level and can significantly improve the ...