YAG激光毛化原理及其在冷轧辊上的应用

激光毛化技术在现代工业中的应用极为广泛，其生产的激光毛化板具有良好的延伸率和深冲性，是汽车、家电、电子器件和装饰板的优良材料，本文从本钢冷轧厂激光毛化设备结构入手，对其原理及功能做了细致的分析，并对激光毛化在冷轧上的应用进行了深入的研究。     

汽车拼板的激光焊接

介绍了拼板焊接的激光焊原理，工艺及焊接接头性能，同时概括了当今几大汽车生产厂家及钢铁厂薄板的激光焊焊接现状。     

日本利用激光焊接铝合金

日本利用激光焊接铝合金铝是一种化学活性较强的金属，易与空气中的氧化物，形成氧化铝，特别是在高温下；在铝材表面上也有一层薄薄的氧化膜，因此铝及铝合金不易焊接。近期，日本三协铝业公司利用１０００瓦的钇铝石榴石（ＹＡＧ）激光成功地焊接了铝。采用这种激光焊接...     

激光焊接技术研究

介绍了激光焊接技术的研究概况,包括焊接用激光发生器、激光焊接工艺参数、激光焊接工艺特点等,重点介绍了激光焊接在汽车工业中的应用情况.     

LGHS深冲钢性能研究与控制

在对比分析两种成分深冲钢的力学性能、深冲性能、织构特点的基础上，设计了LGHS深冲用钢，制定了生产工艺，获得了不同性能的深冲用钢，分析了生产工艺对产品性能的影响。     

薄板激光焊接接头强塑性探讨

对汽车用薄板的激光焊接接头进行了拉伸试验、弯曲试验及量微硬度分析等，推导出窄小激光焊缝强度的简捷计算式，结果这些试验分析方法对于研究激光焊接接头强塑性是可行的。     

激光焊接时,焊接金属冷却速率的研究

以色列的亚夫内冶金机械厂新近研究了３０４Ｌ不锈钢激光焊接时钢组织结构的变化，以确定最佳焊接工艺参数。焊接时采用的是高功率连续ＣＯ２激光器。实验结果可以用公式λ１＝４０ｖ－１２表示。此处的λ１为初生枝晶间距（μｍ），ｖ为焊接速度（ｍｍ／ｓ）。该厂以不同功率的激光焊接器对两种厚度的不锈钢的焊接进行了试验，通过不同的方法测得的焊接金属的冷却速率在１０２～３×１０３Ｋ／ｓ范围内，温度梯度在１０２～９×１０２Ｋ／ｃｍ范围内。这一结果与近年来研究得出的枝晶生长模型极为相似。金属熔融旋压与不锈钢激光焊接有着相…     

为造船用钢设计的激光-电弧混合焊接工艺

英国剑桥TWI有限公司的研究人员介绍了一种用于DH36钢的CO2激光-MAG混合焊接工艺，DH36钢是一种高级造船用钢，此钢对低温韧性有一定要求。在激光-电弧混合焊接工艺中，一个焊接电弧和一个激光束在同一个熔池中聚合。此工艺克服了采用这两种单工艺时存在的缺点，例如激光焊要求焊接处尺寸公差要小，电弧焊穿透深度有限。     

22MnB5钢激光焊接接头冷变形行为研究

采用金相显微镜、扫描电子显微镜、显微硬度仪和拉伸试验机对22MnB5钢激光焊接接头不同压下率下冷变形后接头进行检测。结果表明，随着冷轧压下率增加，塑性变形程度增加，焊缝宽度和硬度增加，激光焊缝显微组织为板条马氏体，焊接接头抗拉强度基本不变，22MnB5钢激光焊接接头具有良好的冷变形性，在冷轧压下率小于80%时，不会由于焊接接头和母材组织不匹配而出现断带等安全问题。     

高硅铝合金脉冲激光焊接工艺研究

文章采用脉冲激光焊机针对Al-27Si进行了表面脉冲激光熔敷焊接试验,通过调整焊接电流、焊接速度、激光脉宽和激光频率,系统分析研究各种激光焊接参数对焊缝表面成型质量和横截面形状尺寸的影响规律。实验结果表明,提高焊接电流、激光脉冲宽度和频率,均能增加焊接热输入,从而增加焊接熔深;增大焊接速度,焊缝熔深减小,鱼鳞状波纹宽度增大。综合分析,在焊接电流90A、激光脉宽2ms、频率30Hz、焊接速度200mm/min的焊接规范下,能够得到较好的焊接接头。     

热轧深冲钢板的分析和应用

在对比冷轧深冲钢的基础上,分析了工业试制的热轧深冲钢板的组织和性能。研究结果表明：该钢的碳含量较低,相应的金相组织和晶粒度合适;厚度大于２ｍｍ的钢板未经冷轧和退火处理可达到与冷轧深冲钢弧相当的成型性能,是代替冷轧深冲钢板冲压汽车零件的理想材料。该钢生产工艺简单,质量稳定,具有明显的经济效益和社会效益。     

Deep Drawing of Friction Stir Welded Thin Sheet Aluminium Steel Tailored Hybrids

Friction stir welding undergoes a steep evolution in industrial applications since the invention in the early 1990s. Especially for aluminium alloys in sheet thicknesses over 2 mm a lot of applications are established, whereas a lack in knowledge about friction stir welding of thin sheets with sheet thickness less than 2 mm exists. This article deals with friction stir welding of thin sheet aluminium steel tailored hybrids and their formability. These investigations tend to close the gap of availability of friction stir welded blanks in the range of 1 mm sheet thickness and to offer new applications of this joining technology. For production of aluminium steel tailored hybrids AA5182 with a thickness of 1.2 mm and DC04 in 1.0 mm are used, the joining partners are friction stir welded in a lap joint. Different tool geometries and process parameters are performed to achieve the highest strength and elongation at fracture of the tailored hybrids. The influence of the stirring on the arrangement and distribution of both materials in the welding zone and its microstructure is analysed using light optical and scanning electron microscopy. In addition to tensile tests planar microhardness measurements help to detect the local changes of the mechanical properties in the characteristic zones of the weld seam. Tailored hybrids, which were friction stir welded with the best welding parameters in accordance to the mechanical properties of the weld seams, were used for deep drawing tests of friction stir welded thin sheet aluminium steel tailored hybrids. The maximum drawing ratio of these tailored hybrids coincides with the one of the parent material of AA5182.     

Investigations of Forming Behaviour in Laser Shock Forming

The continuing trend of miniaturization has entailed the need for new cost efficient and fast methods for processing small parts. In this paper a new non‐mechanical process for the forming process of micro deep drawing is presented. This new deep drawing process utilizes a laser initiated plasma shock wave at the target, which forms the sheet. Several pulses can be applied at one point and therefore high forming degrees can be reached without increasing the energy density. In this paper the pressure of the shock wave is measured in order to enable optimizations of the process in future. Furthermore, an analysis of the thickness distribution over the deep drawn cups will be introduced. Laser deep drawing of samples made of Al99.5, Cu and stainless steel sheet metal with thicknesses of 20 μm and 50 μm are shown. Finally the efficiency of the laser shock forming process in calculated.     

DC04冷轧深冲钢生产试制

八钢冷轧深冲钢以生产IF钢为目标,通过研究IF钢的机理,制定了相应的工艺制度,生产出的汽车用冷轧深冲钢产品力学性能较好,用户使用后满意。     

冷轧深冲用钢生产工艺改进

冷轧深冲用钢通过试制改进后采用无间隙原子钢材质,并对热轧工艺、冷轧工艺、退火工艺等进行调整。工艺调整后材料具有高的塑性应变比、高的应变硬化指数、低的屈服强度,使材料具有优良的成型性能,最终产品满足了用户的使用要求。     

关于深冲薄钢板中的夹杂和成形性的商榷

对深冲薄钢板大生产的全工艺过程进行了跟踪，研究了ＷＹ０８ＡｌＡ薄钢板中Ａｌ＿２Ｏ＿３的形成，形态以及它们对冷轧成品的深冲性能和冲压小件的冲压成形废品率的影响。     

深拉型搪瓷内胆用热轧钢带开发及应用

热水器搪瓷内胆结构由三段式升级为二段式,内胆毛坯的成形方式由卷圆成形+冲压成形方式转变成深拉成形方式,相应的钢板也必须满足深拉成形要求。由于搪瓷内胆结构的变化,对钢板提出了更高的要求,在保障涂搪性能的基础上还需更好的深拉性能。宝钢运用钢厂工业数据与试验设计(DOE)工具,建立钢种设计优化模型,开发出了深拉型搪瓷内胆专用热轧钢板。经工业大生产验证,深拉件报废比例可以控制在千分之四以内,涂搪性能优良。     

用正电子寿命法研究深冲钢板不同变形路径中的微观缺陷

本文应用正电子寿命法研究了深冲钢板在单向拉伸、平面应变和等双向拉伸变形过程中的位错和微空洞增长机制。结果表明,深冲钢板的宏观失稳及成形极限与板材内部的微观缺陷的产生及发展密切相关;当变形路径不同时,缺陷的增长速率不同;当应变量小于0.2～0.35时,材料内的微观缺陷以位错增长机制为主,且平面应变的缺陷增长速率最大,当应变量大于0.2～0.35时,微空洞的形核及增长速率加快,对板材集中失稳起到促进作用。     

umerical Study on Welding Line Behavior of Deep Drawing TWB Process

 The FEM technology is used to analyze the welding line movement behavior of deep drawing TWB sheet with different thickness. It is found that high stress fields are concentrated around the welding line and large residual stresses are left. The effect of the welding line movement is like a rigid string and the selected nodes of the thin part near the welding line show the related larger strain.     

Numerical Study on Welding Line Behavior of Deep Drawing TWB Process

Tailor-welded blanks ( TWB) are composed oftwo or more sheets of metal with dissi milar strengthand/or thickness that are weldedinto a single blank.TWBs are stampedinto automotive body panels andoffer reduced part weight and i mproved materialuse[1]. They are most commonly fabricated using alaser welding process , which creates a narrow weldand a heat-affected zone ( HAZ) at the junction ofdissi milar sheets . As the variety of TWB applications increases ,the effects of the weld on blank f…