气电横焊工艺技术改进

为了解决船舶横位置对接焊缝中存在的焊接效率低、质量可靠性差等问题,开展了针对船舶对接焊缝的气电横焊技术研究。通过对水冷铜滑块、陶瓷衬垫等关键条件的设计优化,将气电焊技术扩展至船舶建造横位置对接焊缝的焊接。随后对坡口形式、焊枪位置、摆动幅度等关键焊接工艺参数进行了合理的设计,结合船舶结构特点及工艺覆盖的要求,进行了3组不同板厚的横位置对接焊试验,测量了不同板厚的抗拉强度、硬度及冲击吸收能量,以验证工艺的可行性。结果表明,由于焊缝表面采用水冷铜滑块强制成形及焊缝根部采用陶瓷衬垫成形的影响,得到的焊缝成形美观,避免了焊后打磨处理,大大减轻了劳动强度;各个板厚的抗拉强度、硬度及冲击吸收能量等试验数据均满足船级社规范要求,并具有较大的工艺裕量;热输入最高可达93 kJ/cm,焊接效率相较于常规FCAW横焊提高了8倍左右。 创新点： (1)对陶瓷衬垫以及水冷铜滑块设计优化,有效解决了船舶横位置对接焊缝中根部焊缝的熔合问题。(2)将气电横焊技术用于船舶横位置对接焊缝的焊接,提高了横位置对接焊缝的焊接效率。     

Analysis on the joint tensile strength and fractography of TiNi shape memory alloy precise pulse resistance butt welding

This paper studies mechanical property and fiactography of the welded joints obtained in different welding parameters such as welding heat and welding press wlth/without gas shield in TiNi shape memory alloy precise pulse resistancebutt welding using tensile stength test, XRD, SEM and TEM measures. The optimum welding parameters obtaining high tensile strength welded joint are SOL On the condition of welding press magneting current 2 A and welding heat 75%, the joint strength is the highest. This is important for to study other properties of TiNi shape memory alloy further. The experimental results state that argon gas shield haze different effects on different welding parameters, less on welding press,but great on welding heat. But excessive welding press and welding heat have great effects on joint tensile strength. Too high welding heat can produce the new intermetallic compound, this intermetallic compound lead to dislocation density to increase and form the potential crack initiation, which can easily make the flint fracture under stress effect and decrease the shape memory ratio of joint for high density dislocation groups existing in the twinned martensite.     

关于大直径焊接钢管生产的探讨

简要介绍了大直径螺旋焊管和直缝焊管的各种成型工艺特点，分析了生产所需的外部条件。提出在我国新建大直径直缝焊管机组时，从投资省、见效快的目的出发，宜优先引进RBE或“C”成型工艺技术和关键设备，以及在鞍钢应新建RBE大直径直缝焊管机组。     

磁驱动旋转电弧对焊的研究

本文对无气体保护磁驱动电弧对焊设备的电源部分、磁驱动部分、控制部分以及焊接参数监测等关键技术进行了研究,文中还对无气体保护磁驱动旋转电弧对焊过程和焊接参数对焊接质量的影响进行了分析,并推导出工件端部温度场计算公式和最佳焊接规范计算法。这些分析计算具有很大的实用价值.在这些研究的基础上,研制出一台无气体保护磁驱动旋转电弧对焊机,该机具有生产效率高、节能、焊接质量良好等特点。它适合于在大规模生产线上应用。     

双丝埋弧焊焊接工艺参数对焊缝成形的影响

为了研究双丝埋弧焊这种高效焊接工艺对低合金高强钢焊接成形质量的影响,进行了双丝理弧焊对接试验.试验结果表明,电流、电压一定时,改变双丝排列方式从双丝串列、并列到错开方式,从接头成形和力学性能分析来看,只有双丝串列的双丝埋弧焊工艺适合低合金高强钢的时接焊接;为确保接头成形质量,双丝间距、焊接速度以及焊接电流、电压应控制在...     

钢筋矩形环成型机构的研制及其焊接工艺研究

针对钢筋矩形环在手工成型及焊接时出现的种种问题,设计了一套全自动的矩形环成型及焊接生产线.经过钢筋校直、切断、送进及端头成型和对焊等工序实现了整个矩形环的成型与焊接.设计的生产线能满足各种规格和不同长度钢筋矩形环的生产.利用电阻对焊的方法实现了对成型的矩形环结点的焊接,利用各种传动机构实现了整个生产线内部的有机连接.结果表明.研制的生产线运行可靠,能生产出合格的钢筋矩形环.     

Low-pressure arc butt welding of 70 mm diameter pipe adapters made of AMg3+OT4 dissimilar alloys

The parameters of the technology of low-pressure arc butt welding 70 mm diameter pipe adapters in AMg3+OT4 dissimilar alloys are determined. Welding is carried out in modernized STYK-3 equipment using an improved welding procedure in which a transverse magnetic field is applied to the arc burning in the gap between the ends of the welded pipes. Equipment is fitted with an inverter arc power source. Taking into account the conditions of formation of welded joints by weldbrazing and restricting the temperature of the ends of the OT4 alloy to 850–1000°C, the wall thickness of the pipe blanks is selected and welding conditions determined. The mechanical properties and microstructure of the welded joints are investigated.     

Joint material of aluminium and stainless steel for welding

Welding of collector pipes, flat heads, dished ends and connector pipes made with high temperature and creep-resistant steels is most often done through a combination of TIG and MMA processes. Progress in MAG techniques and the availability of high-quality welding consumables (solid wires) now also enables MAG welding of the above-mentioned connections. In order to prove the efficiency of such, the results of our own studies are presented in this article. The range of tests applied was similar to those used during standard qualification of welding technologies. Additionally, the economics of welding 16Mo3 steel butt joints using different combinations of welding processes was assessed and compared.     

Influence of arc pressure on the forming of molten pool in tungsten inert gas arc butt welding with micro gap for tantalum sheet

0IntroductionHaving better plasticity and workability, high meltingpoint, and excellent resistance to a lot of sour, ethanol,chloride, sulphuret and other chemical articles, tantalumis a rare and important strategic material and nowhas beenwidely applied in some fields such as chemical, aero-space, atomic, electronic industrial, etc[1]. For continu-ous tungsten inert gas welding of tantalum sheet, becauseof high welding speed, thin thickness of workpiece andcertain butt gap, some shaping defec…     

厚薄板对接单面焊双面成形自动焊机的研制

根据集装箱吊车箱形梁中厚薄板焊接要求,设计了一台专用自动焊接设备.针对不同厚度板的时接形式,采用单面焊双面成形技术,设计了独特的工件定位压紧和焊枪对中方式,实现了焊接过程的自动控制以及工艺参数设定存储和选用的数字化控制,保证了焊接过程稳定可靠,较好满足了生产需求.