共查询到19条相似文献,搜索用时 140 毫秒
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对H65 黄铜厚板材旋转压力焊过程中搅拌头旋转速度对焊接质量的影响进行了研究与分析,所选用的旋转速度分别为 600,800,1000 r/min。研究过程中通过光学显微镜(OM)、扫描电镜(SEM)对H65黄铜合金旋转压力接头区域的微观组织进行观察,并检测接头区域的力学性能。结果表明:旋转压力焊工艺能够有效连接H65黄铜大尺寸厚板材,接头区无明显裂纹,但其微观组织中存在少量气孔,且随旋转速度的增加逐渐减少;接头区域的H65黄铜晶粒明显细化,随旋转速度的增加β相占比减少,有效提升了接头区域的塑性;当搅拌头旋转速度为1000 r/min时, H65黄铜连接效果最好,接头的拉伸强度为348 MPa,延伸率为48.4%,断口呈韧性断裂。 相似文献
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搅拌摩擦焊的旋转速度对接头焊缝形貌、微观组织和力学性能均有较大的影响。采用搅拌摩擦焊方法对5 mm厚的(WC+B4C)p/6063Al复合材料进行焊接试验,固定焊接速度为100 mm.min-1,旋转速度分别为900,1100,1300和1500 r.min-1,焊后观察焊缝宏观形貌和各种缺陷,并对接头的微观组织和力学性能进行了分析。焊缝宏观缺陷研究结果表明,随着旋转速度的升高,焊接热输入量增大,金属流动性得到改善,飞边、沟槽等宏观缺陷显著增多,焊缝形貌越来越粗糙;接头微观组织研究表明,由于搅拌头的搅拌作用,相比于母材,在焊核区增强相颗粒分布更加均匀,更多增强相颗粒发生破碎,且随着旋转速度的增加,这种趋势增强。对接头的抗拉强度研究表明,在1300 r.min-1以内时,随着旋转速度增加,接头抗拉强度随之增加,最大值为166 MPa,进一步增加到1500 r.min-1时,强度又有所降低,为154 MPa。 相似文献
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6061铝合金搅拌摩擦焊接头组织与性能研究 总被引:1,自引:1,他引:0
采用搅拌摩擦焊方法(FSW)对6 mm厚的6061-T4铝合金板材进行对接,焊后利用光学显微镜(OM)和扫描电镜(SEM)分析、对比了焊接接头和母材的显微组织和断口形貌特征,并测试了其室温拉伸性能和显微硬度。实验结果表明:选择了适合于6061-T4铝合金板材搅拌摩擦焊的工艺参数:焊接时搅拌头旋转速度为1200 r.min-1,工件的进给速度为300 mm.min-1,在此参数下获得了与母材等强度、韧性接近于母材的焊接接头,为此种合金应用于汽车关键零部件提供了可靠的工艺方法。FSW板材接头焊核区的组织和性能明显优于其他区,热影响区是接头最薄弱的部分,焊核区的硬度最高,而热影响区的硬度最低,焊缝金属发生回复再结晶使晶粒细化。断口分析表明,断裂发生在热影响区,由于搅拌头的旋转运动和热量的累积,该区存在晶粒长大、组织粗化现象。对工艺参数的优化实验表明,搅拌头旋转速度与焊接速度对接头性能的影响存在一定的适配关系,通过工艺参数的调整可以有效地控制热影响区的焊缝组织和改善焊接接头的性能。细晶强化是搅拌摩擦焊接头强度与韧性提高的主要原因。 相似文献
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对3 mm厚6061-T6铝合金板材的搅拌摩擦焊工艺进行试验研究,分析了在搅拌摩擦焊焊接过程中不同搅拌头转速、焊接速度对焊接接头力学性能和焊缝中"S"线缺陷的影响。研究结果表明,当搅拌头转速保持在1 200 r·min~(-1)时,焊接工艺窗口较宽;当焊接速度为700 mm·min~(-1)、搅拌头的旋转速度为1 200 r·min~(-1)时焊缝的强度最高,为251.608 MPa,焊缝强度达到了母材的81.16%。焊接过程中提高搅拌头的旋转速度、减小焊接速度能够减少焊缝中"S"线缺陷的产生。 相似文献
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《稀有金属》2016,(5)
采用圆台形搅拌针和倒圆台形搅拌针分别对2 mm厚的AZ61B镁合金材料进行了搅拌摩擦焊(FSW)搭接试验,研究了搅拌针形状及旋转速度对搭接接头迁移界面的影响。研究结果表明,倒圆台形搅拌针作用下的搭接接头焊核区出现明显的分层现象,而圆台形搅拌针作用下的搭接接头焊核区分层现象不明显,并且前者的接头界面迁移高度较后者的低。旋转速度对接头的焊核区形貌及界面迁移高度也有重要的影响:随着旋转速度的增大,焊核区尺寸也逐渐增大;当焊速为定值时,随着旋转速度的增加,界面迁移高度也随之增加,当旋转速度超过一定值时,即圆台形搅拌头的旋转速度大于1200 r·min~(-1)或倒圆台形搅拌头的旋转速度大于1100 r·min~(-1)时,界面迁移高度将保持恒定或减小。剪切拉伸性能测试结果表明,断裂均起源于迁移界面,然后沿着垂直于载荷方向断裂;界面迁移高度越低,接头抗剪强度越高;与圆台形搅拌针相比,倒圆台形搅拌针获得的接头最大抗剪强度提高了10%。 相似文献
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为了研究Mg-1Al-3Sn镁合金搅拌摩擦焊工艺性能,采用不同的旋转速度和焊接速度进行了平板对接搅拌摩擦焊接试验。结果表明,在较宽的焊接工艺参数范围内,可以获得无缺陷的焊接接头,接头效率在80.5~91.9%之间。 相似文献
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超细晶材料综合性能优异,但组织热稳定性较差,焊接后接头组织容易发生异常长大,使其性能急剧下降。因此,合适的连接工艺对大尺寸超细晶结构件的应用具有重要工程意义。以超细晶铜、粗晶铝以及粗晶铜、粗晶铝作为结构母材,采用热输入量小的搅拌摩擦焊(FSW)工艺进行连接探索,系统观察了铜铝接头组织与性能。结果表明,超细晶铜与铝接头界面处元素互扩散能力较强,形成较多的Al4Cu9 金属间化合物;在焊接过程中,当搅拌头转速为1000 r/min,焊接速度为50 mm/min时,粗晶铜与铝接头硬度可达HV 211,超细晶铜与铝焊接接头可获得良好的力学性能。 相似文献
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Yao Shi Yumei Yue Liguo Zhang Shude Ji Yue Wang 《Transactions of the Indian Institute of Metals》2018,71(1):139-145
Refill friction stir spot welding (RFSSW) technology was used to weld 2 mm-thick 2198-T8 aluminum alloy in this work. As one of the most significant factors affecting the joint mechanical properties, effect of the tool rotating speeds on microstructure and mechanical properties of the RFSSW joint was mainly discussed. Results showed that keyhole could be successfully refilled after the RFSSW process. Due to the complicated movement of the tool components, different material flow behaviors could be obtained at the pin affected zone and sleeve affected zone, leading to different microstructures at the two regions. By undergoing through different heat cycle during welding, the secondary phase particles (Al2Cu) showed different morphologies and sizes at different regions. The lap shear failure load of the joint firstly increased and then decreased with increasing in the rotating speed. The maximum failure load of 9298 N was obtained when using 1600 rpm. All the joints showed lap-shear fracture mode. 相似文献
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高温合金GH150氩弧焊接头的组织和力学性能 总被引:1,自引:0,他引:1
用金相分析和微型剪切试验等方法研究了高温合金GH150焊接接头各区域的微观组织和力学性能分布特性。该焊接接头中的熔合区组织和力学不均匀性最为严重,是该焊接接头最薄弱的部位。 相似文献
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Yaodong Cen Lin Chen Xirong Bao Xiaodong Wang 《Transactions of the Indian Institute of Metals》2020,73(1):161-168
A novel resistance plug welding process has wide prospects for dissimilar steel. However, until present, there is no effective method to characterize the mechanical properties of resistance plug welding joints. In this paper, the influence factors such as diameter of filler, diameter of surface plastic ring, and diameter of nugget were first used for analysis. Slug ratio and indentation depth (height) ratio were designed to characterize the mechanical properties of the resistance plug welding joints. The results show that smaller the slug ratio, better the mechanical properties of the joint. The tensile shear load of the joint is higher when the indentation depth (height) ratio is 92–102%, and the joint has the best tensile shear load when the indentation depth (height) ratio is 96% or 97% in this study. Slug ratio and indentation depth (height) ratio are suitable for characterizing mechanical properties of dissimilar steel resistance plug welding joints. 相似文献
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针对耐候钢05CuPCrNi,采用CO2气体保护焊,通过化学成分、焊接裂纹试验、对接接头力学性能试验,对其焊接性能进行检验,碳当量分析表明,该钢淬硬和冷裂倾向不大,可以不预热焊接。冷裂纹敏感系数表明,冷裂倾向不明显,接头金相及力学性能结果表明,按常规焊接工艺,所得焊接接头组织正常和机械性能优良,满足工程使用要求.经综合分析耐候钢05CuPCrNi具有良好的焊接性能. 相似文献
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Steeliswidelyusedbecauseofitsgoodcompre hensive properties ,plentyofresourceandlowerprice .Thestrengthandtoughnessaretwoimpor tantpropertiesofsteels ,andpeoplemakeeffortstoincreasetheirvalues .Addingalloyingelementandcontrollingmicrostructurearetwobasicwaystoac complishtheaim .Therefinedmicrostructureob tainedbyprocessingtechniqueenablesthestrengthandtoughnessofsteeltobeincreasedwithoutaddingalloyingelementandtheratioofperformance costtobeincreased .Theultra finegrainedsteelshavefer ritegrains… 相似文献
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Hakan Aydin Mümin Tutar Ali Durmuş Ali Bayram Tayfun Sayaca 《Transactions of the Indian Institute of Metals》2012,65(1):21-30
The present work describes the effect of welding parameters on the tensile properties and fatigue behaviour of 2014-T6 aluminum
alloy joints produced by friction stir welding (FSW). Characterization of the samples has been carried out by means of microstructure,
microhardness, tensile properties and fatigue behaviors. The hardness in the softened weld region decreases with decreasing
the welding speed. Irrespective of the tool rotation speeds, the best tensile and fatigue properties were obtained in the
joints with the welding speed of 80 mm/min. The joint welded with a rotating speed of 1520 rpm at 80 mm/min has given a highest
tensile and fatigue properties. The fatigue behaviors of the joints are almost consistent with the tensile properties, especially
elongations. Higher ductility in FSW joints made the material less sensitive to fatigue. The location of tensile fractures
of the joints is dependent on the welding parameters. On the other hand, the fatigue fracture locations change depending on
the welding parameters and stress range. In addition, a considerable correlation could not be established in between heat
indexes and mechanical properties of FSW 2014-T6 joints under the investigated welding parameters. 相似文献