铝合金激光-电弧复合焊研究进展

激光-电弧复合焊接是一种将激光与电弧两种热源相结合的焊接技术,因激光与电弧相互之间的协同效应使得此焊接方法有"1+1>2"的效果,集激光和电弧的优点于一身,可以获得接头质量更好的焊缝.目前铝合金焊接工业上的主流技术还是MIG、TIG等传统焊接方法.相比于传统焊接方法,激光-电弧复合焊有不可取代的优势,很多学者也就调控其...     

浅谈铝合金的焊接

就铝合金的焊接与铆接进行了比较，并指出了铝合金焊接的特点。介绍了常用的铝合金焊接方法及提高铝合金焊接接头机械性能的多种途径。同时，对铝及铝合金的焊接趋势进行了展望。     

地铁车辆铝合金车体搅拌摩擦焊浅析

针对铝合金轨道车辆车体焊接难题,对熔焊、激光焊与搅拌摩擦焊等焊接工艺的接头性能、焊接效率与工作环境等进行了比较研究。重点讨论了低成本、高质量的搅拌摩擦焊在铝合金车体焊接大规模工业化生产中的可行性,对于提升我国现今轨道交通车辆装备制造水平具有一定的借鉴意义。     

铝合金焊接性能及焊接接头性能的研究

在高铁、地铁列车的制造中,铝合金材料更是列车车体的主要材料之一,然而由于铝合金材料在焊接性能、焊接接头性能方面仍存在一定的不足,经常会出现气孔、裂纹等缺陷,因此高铁、地铁列车铝合金车体的焊接施工质量仍然很难保证。本文对铝合金的焊接性能以及焊接接头性能进行了分析。     

铝合金激光深熔焊接热过程有限元数值模拟

对铝合金5A06简体纵缝进行激光深熔焊接。建立了该条件下的焊接热源模型,热源模型由沿激光入射方向的旋转高斯体热源构成。使用该热源模型和ANSYS有限元分析软件对前述的试验进行了数值模拟。为制定和优化焊接工艺提供必要的参考。     

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.     

铝合金激光焊接技术优化研究

铝合金具有密度低、强度高、耐腐蚀性好等优点,是许多产品的理想原料。而激光焊接技术具有焊接形变小、工作效率高、焊接性能好等优点。随着社会的进步,经济的发展,激光焊接技术也在不断的发展,进一步优化激光焊接技术,开展新方法的研究是非常重要的。我们在进行优化研究之前,要对铝合金激光焊接技术的当前状态和发展趋势有所了解。本文对目前铝合金激光焊接技术进行阐述,并提出了优化铝合金激光焊接技术的方法。     

铝合金激光—电弧双面焊接中“双弧”形成机理探讨

铝合金激光焊接技术存在着一定难度,探讨铝合金激光-电弧双面焊接中"双弧"的形成机理。通过了解铝合金激光焊接发展现状,获得其焊接方法,得出铝合金激光的焊接中存在接头产生焊缝裂纹和接头软化等难点。分别研究铝合金双面双弧非对称焊接、对称焊接,得到-电弧双面焊接中"双弧"形成机理。反面碳弧气刨和检验等焊接程序,被双弧焊取消了,在一定程度上提升了焊接效率,这一焊接方法是高效节能的工艺技术,为提高焊件质量和力学效果提供可靠的参考依据。     

铝及铝合金焊接工艺研究

铝合金材料焊接技术是目前我国机械工业中以有色金属为主体的新型焊接技术,它已在我国机械工业中大量生产,并以此为基础进行整体焊接,在我国民用航空、航天、汽车、机械制造、船舶及有色金属加工化学品等机械工业中得到广泛应用。近几年来,随着我国焊接科学材料技术和机械工业以及国民经济的不断进步,焊接铝及铝合金的广泛应用和焊接铝合金金属结构件的快速发展,技术需求日益增多,铝合金的广泛应用以及焊接件的性能和技术研究也逐步发展起来。铝合金的广泛应用,不仅极大地推动了铝合金焊接技术的广泛应用,以及金属焊接结构的迅速进步和发展,随着我国焊接技术的迅速发展以及焊接工艺的不断创新,铝合金焊接技术的应用领域也不断扩充、适用的范围也在继续扩大。     

铝合金焊接接头的数值模拟及实验分析

随着科学技术的发展,铝合金材料的使用越来越广泛。传统的铝合金材料在进行焊接过程中主要使用高亮激光焊接方法,但是这种方法热循环过程足以造成焊接接着强度的降低。为此,文章主要对高强铝合金激光焊接接头进行了研究,结果表明,使用激光焊接铝合金,气孔倾向小但是裂纹倾向大。铝合金焊接接头温度较高,呈开裂状,表面在焊接过程中状态严重影响焊接效果。在进行二次时效强化时,GPB区演变成较微小针状S相,析出强化硬度高于母材。     

Laser Welding of Ultra-Fine Grained Steel SS400

Steeliswidelyusedbecauseofitsgoodcompre hensive properties ,plentyofresourceandlowerprice .Thestrengthandtoughnessaretwoimpor tantpropertiesofsteels ,andpeoplemakeeffortstoincreasetheirvalues .Addingalloyingelementandcontrollingmicrostructurearetwobasicwaystoac complishtheaim .Therefinedmicrostructureob tainedbyprocessingtechniqueenablesthestrengthandtoughnessofsteeltobeincreasedwithoutaddingalloyingelementandtheratioofperformance costtobeincreased .Theultra finegrainedsteelshavefer ritegrains…     

金刚石锯片焊接部位的组织结构与力学性能

采集金刚石圆锯片激光焊和高频钎焊部位作试样,分析研究了钢基体与粉末烧结刀头过渡层对焊焊缝横向的区段划分、焊缝形貌、金相组织、成分与物相、硬度及抗弯强度,并阐述了激光焊气孔的成因。结果表明:激光焊熔化区柱晶组织排布细腻,有残留气孔,硬度呈线性变化;钎焊熔化区为两相组织,枝晶明显,无裂纹气孔,硬度较低。激光焊钢热影响区产生针状马氏体;钎焊不存在相变引起的热影响区。激光焊和钎焊的刀头过渡层,在特定的配料体系下,也不存在固态相变引发的热影响区,基本保持了粉末烧结组织。激光焊和钎焊焊缝的抗弯强度均值分别为1 175 MPa、983 MPa,都大于国外安全强度要求,但激光焊焊缝强度波动相对较大,这与其残留气孔密切相关。     

镁合金焊接技术的研究现状

镁合金发展前景广阔,但焊接性较差限制了其应用。文章介绍了镁合金的钨极氩弧焊、熔化极惰性气体保护焊、激光焊、搅拌摩擦焊、电子束焊、电阻点焊等常用的几种焊接方法及其研究现状,提出了镁合金焊接今后的研究方向。     

汽车板激光焊工艺研究

为拼接超宽汽车用板，对深冲钢板进行了激光焊接试验研究，结果表明，使用ＣＯ２激光焊接工艺焊速高，可以获得无变形，成形性良好的焊接接头，其力学性能和深冲加工均与母材相当。     

BTi -62421S高温钛合金超塑成形与焊接工艺研究

设计了新型高温钛合金BTi - 62421S舵面模拟件超塑成形模具,结合超塑成形与几种典型焊接技术,研究了激光焊、滚焊等焊接方法对超塑成形的影响,最终研制出钛合金舵面模拟件超塑成形零件.结果表明采用激光焊与滚焊工艺都能很好地保证两层钛合金板气密性要求,激光焊接工艺效率更高、表面质量更好,选择适当的激光焊接工艺参数可获得...     

Joining Technology of Dissimilar Materials for Automotive Components(Ⅱ)

Joining techniques of dissimilar materials for lightweight multi-material automotive body structure were discussed. The joining of 1 .4 mm thickness steel and 2 mm thickness of Al were performed by the new method that is hybrid laser welding system. After aluminum and steel were welded by laser hybrid welding process, the micro-structure investment and the micro-hardness test were carried out. Hybrid laser welding promises a bright future in joining technology of dissimilar materials for automotive components.     

Increasing Rigidity and Strength using Local Effects of Bead‐on‐Plate Laser Welding Seams

In order to achieve graded strength properties and to improve the rigidity of metallic materials, side effects of the laser joining process are used. Local physical and geometrical effects which have only been observed as side effects are to be used purposefully. The investigations take place in context of the SFB 675 “high‐strength metallic structures and joints by setting up scaled local material properties”. The energy needed to produce bead‐on‐plate welding seams can be limited to a small area of the workpiece by using a focused laser beam with a diameter of tenths of a millimetre. The heat affected zone of a laser beam is very small. In comparison to other welding procedures, lower heat input is the main reason that basic material characteristics remain unaffected after welding. The progressive development of laser beam sources to higher available laser output power has extended their spectrum of use in the field of joining technologies [1, 2]. It should be pointed out that local physical and geometrical effects can be used to achieve specific material characteristics. Bead‐on‐plate laser welding seams were produced to demonstrate that strength and rigidity can be increased in metal sheets. First investigations are carried out on the micro‐alloyed high‐strength steel H340LAD. The sheets were tested using tensile tests and also with 3‐point and 4‐point bending tests. Six different specimens were investigated, one without welding seams and five with different laser based welding seam types. The tensile and bending tests showed that higher forces were needed to rupture or to bend the laser welded specimens. Furthermore, the investigations showed that the strength of the specimens was increased in comparison to the specimens without welding seam.     

Metallurgical and Mechanical Characterization of Laser Spot Welded Low Carbon Steel Sheets

This paper aims at investigating metallurgical and mechanical characterization of low carbon steel laser spot welds. Microstructural examinations, microhardness tests and quasi‐static tensile‐shear tests were preformed. Mechanical properties of the welds were described in terms of peak load and failure mode. The effects of laser spot welding parameters including pulse frequency, laser energy, welding speed, pulse width and welded circle diameter, on low carbon steel laser spot weld performance were studied using the Taguchi design of experiment method. It was found that the effective laser pulse energy is the controlling factor in the determination of mechanical strength of laser spot welds.     

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。