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。     

钛与异种材料激光焊接的研究进展

介绍了钛合金激光焊接的技术特点,综述了异种钛合金、钛合金与钢、钛合金与铝、钛合金与非金属材料的激光焊接研究现状,重点论述了激光器、激光焊接工艺参数及焊接方式等对焊接接头组织及性能的影响。通过论述,认为国内钛与异种材料的激光焊接水平与国外相比还存在一定差距。最后,给出钛合金激光焊接技术的主要发展方向:1深入基础研究,实现对激光处理过程的实时监测与闭环控制;2寻求大功率激光焊接技术的突破与发展;3开发TIG-激光复合钎焊等技术,推进激光焊接技术的产业化进程。     

金刚石锯片的激光焊接工艺

采用水平对焊的方式实现了孕镶金刚石锯片刀头与钢基间的高强度激光焊接,研究了激光焊接工艺参数对金刚石锯片焊接质量的影响,激光焊接工艺参数包括：光束模式、激光功率,焊接强度,离焦量,等离子体控制和光束偏离量。试验结果表明,光束模式,激光功率,焊接强度,离焦量,等离子体控制能显著影响激光焊接深度;光束偏离量则会影响焊缝中的气孔数量。     

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。     

铝合金激光焊接的工艺特点及发展现状

概述了铝合金激光焊接的工艺特性及难点,提出改进措施,并指出了铝合金激光焊接技术的研究现状及未来的发展方向。     

TA18钛合金板材焊接工艺对比研究

研究了直流钨极氩弧焊(直流TIG)、脉冲钨极氩弧焊(脉冲TIG)和激光焊接3种不同焊接工艺对TA18钛合金焊接接头宏观形貌、显微组织和力学性能的影响。结果表明,与直流TIG焊接工艺相比,脉冲TIG焊接工艺的高频脉冲促使电弧能量集中,整体的焊接热输入减小,焊缝宽度降低;激光焊接工艺可显著降低焊接接头宽度,与直流TIG焊接工艺相比,焊接接头宽度减少约69.5%。TA18钛合金激光焊接接头显微组织主要为网篮状排列的针状马氏体α′相及少量块状相变α相,且针状马氏体α′相更加细小。此外,激光焊接接头具有更高的显微硬度,但弯曲性能相对较低。     

铬镍钢纵向焊管的连续生产用的激光束焊接

在铬镍钢纵向焊接管生产中，激光束焊接工艺和混合焊接（激光＋MIG一般用于超马氏体不锈钢管的焊接）工艺用得越来越多。由于要求严格，当用不锈钢材料生产纵向焊管时，原材料的质量必须要满足许多先决条件，如，切边的几何尺寸、焊缝的控制、焊接喷溅、热处理、无损检测和质量保证。要满足这些先决条件，经验是必不可少的。但是，一旦正确掌握了生产工艺，激光焊接和混合焊接工艺无论从技术还是从经济方面来说，是适用于工业生产的。     

镁合金的激光焊接技术研究进展

文章对镁合金的焊接性进行简要分析,总结了镁合金在激光焊接过程中存在的主要问题,对镁合金的激光焊接技术及其国内外研究进展进行了综述,介绍了几种镁合金激光焊接新技术,并对镁合金的激光焊接技术发展趋势进行了展望。     

薄壁TC4钛合金激光焊缝成型与性能调控研究进展

TC4钛合金的焊接工艺及焊接性研究一直受到国内外的广泛关注,主要综述了目前激光焊工艺对薄壁TC4钛合金焊缝几何形状、显微组织及力学性能影响的研究进展。简要分析了激光焊接工艺对焊缝几何形状及焊缝显微组织转变的规律,并对焊缝几何形状和显微组织的转变机理进行了探讨。研究发现,激光焊焊缝几何形状的变化主要原因在于焊接热输入的变化导致焊接过程中激光焊匙孔形状及模式发生了改变;焊接热输入的增加会引起显微组织的转变,焊缝金属中针状马氏体α’相是主要的强化相,块状α_m和魏氏α相是主要的韧性相;应对激光能量进行严格的控制,以便在实际生产应用中提高焊接质量。     

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。     

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。     

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...     

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。     

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.     

激光照射对铝合金焊接件强度的影响

对５０８６Ｈ３２和６０６１Ｔ６合金焊接件进行激光照射后，５０８６Ｈ３２合金的屈服强度纱照射提高７０ＭＰａ，与基体屈服强度近况，６０６１Ｔ６合金屈服强度提高８５ＭＰａ，介于焊接与基体屈服强度之间，在一定的照射条件下，焊接区的维氏金刚石提高１１％，且沿厚度方向的度分布均匀。     

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.