ZX—400晶闸管整流弧焊电源的改进

通过对美国林步电气公司ＤＣ－－４００晶闸管整流弧焊电源的试验分析，找出ＺＸ５－４００晶部管整流弧焊电源在采高纤维素焊条进行了小电流焊接中，产生继弧熄弧粘 、电弧不稳定的原因，并对ＺＸ５－４００晶闸管整流电源进行改进，使其不但适应采用高纤维素焊条进行的下向焊，而且也适应普通焊条的焊接。     

一种晶闸管弧焊整流器的改进

前国内ＺＸ5系列焊机一般都没有电流调节和电弧推力调节功能。在小电流焊接时 ,电弧推力对电弧稳定性和增加熔深都起到很重要的作用 ,我公司在焊接热力管道时 ,由于全位置焊接 ,焊条与工件起弧次数多 ,而瞬间起弧冲击大 ,飞溅量也相应增多 ,容易造成焊道的熔穿和焊道清渣困难。通过对ＺＸ5 - 40 0晶闸管弧焊电源进行改进 ,取得了良好的焊接效果。使我公司生产效率得到一定提高。1　电路特点ＺＸ5 - 40 0整流弧焊电源主回路如图 1。图 1　ＺＸ5 -4 0 0整流弧焊电源回路主回路采用平衡电抗器的双反星形整流电路。在任何时刻每个周期内有 6个波…     

弧焊电源使用和维修培训班在成都电焊机研究所举办

弧焊电源使用和维修培训班在成都电焊机研究所举办［本刊讯］近年来，在广大用户的支持下，成都电焊机研究所向各界用户提供了大批高效、节能的新型焊接设备，且产量和销售形势呈年年上升势头。如ＺＸ５系列晶闸管整流弧焊机、ＺＸ７系列晶闸管逆变式弧焊机、ＷＳＭ系列直...     

单片机控制多外特性的焊接电源

本文介绍一种由单片计算机构成的晶闸管整流弧焊控制系统以及用ＰＩ算法实现恒流、恒流外拖、斜外特性的控制软件。设计中充分利用单片机的软硬件资源，使控制系统简单、、、用。研制的ＺＸ５－８００Ｄ电源在进行钨极氩弧焊、手工电弧焊、碳弧气刨及埋弧焊时均获得满意的性能。     

焊条电弧焊焊机耗电量测试与节能分析

通过实际测试与理论计算，对晶闸管整流电源弧焊机，直流弧焊发电机和逆变电源弧焊机等生产中常用的焊条电弧焊焊机的耗电量情况进行了综合评价。     

单片机控制弧焊电源外特性的研究

本文ＺＸＧ－２５０型硅整流弧焊机为例，介绍了采用ＭＣＳ－５１单片微机控制弧焊电源外特性的原理和方法。阐述了闭环控制系统的硬件结构和软件特点。实验表明，采用微机控制后的弧焊电源，不仅可以实现多种外特性，而且系统的静、动特性及控制特性均得到改善，焊接电流可按预定的工艺曲线输出和实现数字显示，并能实现对故障的自诊断和自处理。     

晶闸管整流弧焊电源的外特性控制──适用于高纤维素焊条的焊接

本文介绍一种晶闸管弧焊电源外特性的控制电路，使其外特性的斜率和拐点分别可调，可适用于高纤维素焊条的焊接要求。     

ZX7—400场效应管逆变焊接电源的特性及应用

本文对一台ＺＸＧ－５００Ｒ硅整流电源和一台ＺＸ７－４００场效应管逆变焊接电源在同条件下的主要性能作了一些试验对比，并由此作出一定分析，另外，根据其特性开发了一些新的用途。     

晶闸管弧焊整流器的静态分析

以ＺＸ_５－４００晶闸管弧焊整流器为例，分析了它的闭环阶段缓降外特性方程式及其斜率，确切地表明了有关环节对外特性曲线形状的影响。为非恒流式弧焊整流器分析、设计、调试提供了一种具体的方法。     

ZX7－400场效应管逆变焊接电源的特性及应用

本文对一台ＺＸＧ－５００Ｒ硅整流电源和一台ＺＸ７－４００场效应管逆变焊接电源（成都德礼公司生产）在同条件下的主要性能作了一些试验对比，并由此作出一定分析。另外，根据其特性开发了一些新的用途。     

低纤维素型全位置立向下焊条的研究

在大量试验基础上,研制了一种纤维素含量较低的全位置立向下焊条,该焊条兼具普通钛型焊条和纤维素型焊条的优点,具有优良的焊接工艺性能;同时该焊条还具有良好的力学性能和抗裂性能,可广泛用于重要结构的焊接.     

Application of electrode force change in single sided resistance spot welding using servo gun

Abstract

Single sided resistance spot welding (SSRSW) is considered as a feasible method to join hydroformed or closed section parts to others in vehicle productions. Unfortunately, it is difficult to guarantee the weld quality utilising conventional air gun. Because of a lack of support inside the closed section parts, the impact of electrode driven by pneumatic gun will cause large deformation of the workpieces at the welding stage and will lead to a crack around weld region after welding completion. In addition, poor weldability is another pressing problem for welding operations. Servo gun with new gun driven method has some merits such as realising the soft touch between electrode and workpieces and changing electrode force during the welding process which are greatly suitable to the sheet to tube joining. Based on the characteristics of servo gun, the present paper investigates a new method to increase the weld quality of sheet to tube joining with SSRSW method. By adjusting the electrode force during the welding process, weld strength would be increased, weld deformation be decreased and weldability lobe curve be widened. The results verify that servo guns can provide high assurance for welding quality of sheet to tube joining and have broad prospect in SSRSW.     

长输管道自动焊接设备及技术发展

随着社会技术进步和人类对石油和天然气需求量的急剧增加,长输管道在向着大口径、长距离、高压力、高钢级方向发展,焊接技术及相关的设备、材料性能也在同步提高,与之相适应的管道焊接技术也在发生着巨大的变化。管材钢级从X42提高到X80;焊接材料从纤维素焊条到自保护药芯、金属粉芯、实心等各种焊丝;焊接方法从手工上向焊到手工下向焊,到药芯自保护半自动焊,再到气保护半自动焊、自动焊,管道焊接技术日趋成熟。结合长输管道施工特点,在分析国内外管道焊接技术差异的基础上,提出我国现阶段长输管道焊接技术发展的建议。     

带状电极MAG焊工艺熔滴过渡分析

采用氙灯背光高速摄像系统对带状电极MAG焊的熔滴过渡进行了研究.试验发现,随焊接工艺参数的增大,钢带端部熔化变得均匀,由多个熔滴并存转变为只产生一个熔滴.熔滴在长大过程中沿钢带端部移动,过渡位置不定.随焊接参数由小到大变化,熔滴依次呈现短路过渡、大滴过渡、射滴过渡、射流过渡和旋转射流过渡等形式.结果表明,射滴过渡是带状电极MAG焊熔滴过渡的主要方式;电流、电压波形与熔滴过渡形式之间有很好的对应关系;由于其特殊的电极形状和熔滴过渡特点,带状电极MAG焊适合大电流高速焊,可以提高焊接效率.     

在用厚壁加氢反应器的常规超声检测

针对在用加氢反应器定期检验的超声检测,依据加氢反应器结构和使用特点确定检测重点部位,提出不等厚焊缝中缺陷的定位修正及反应器堆焊层的剥离和堆焊层间裂纹是检测工艺实施过程中应重点关注的问题。     

A METHOD FOR DETERMINATION OF CONCENTRATION OF ATOMIC HYDROGEN PERMEATED IN MULTI-LAYER STRUCTURE WALL OF HYDROGENATION REACTORS

1.IntroductionTheshellofhydrogenationreactorismadeof2.25Cr-1Morefractorysteelandthereactoroperatesatthetemperatureof633-723Kandatthepressureof7.l-27MPa.Inordertoprevent2-25Cr-1Mosteelfromcorrosioncausedbyhydrogensulfide,hydr0chloride,hydrocyanideandpolythioincacid(H2S.O.),theinteriorwallofthevesselisoverlaidbyTP347orTP309 TP347stainlesssteels.Sincethereart0roperatesinhydr0gengasenvironmentatelevatedtemperatureandhighpressure,hydrogenmoleculesaredi8sociatedilltohydrogenatomsandtheat0msare…     

Study on cracking of welding overlay based on the theory of diffusion-induced stress

Hydrogen diffusion in the wall of hydrogenation reactor for three situations,i.e.operating,normal shutdown and abnormal shutdown,was numerically simulated based on the finite element program-ABAQUS.The formula of diffusion-induced stress was deduced for model of the thin walled cylinder.Distribution of diffusion-induced stress in the wall of hydrogenation reactor was studied.The results showed that the maximum stress was at the fusion surface between welding overlay and base metal,and which would increase w...     

Study of keyhole TIG welding by comparative analysis of two high-productivity torches for joining medium-thickness carbon steel plates

In the usual reference works, welding by the keyhole technique has always been associated with welding processes with high energy concentration, such as the laser process or the plasma process. Recent advances in TIG torches are changing how the TIG welding process should be viewed. An example of these recent advances is the torch with the trade name Infocus, the main feature of which, according to its manufacturers, is the capacity for concentration of energy at the electrode tip, by increasing the cooling power of the electrode, which differentiates the Infocus torch from a conventional TIG torch. This concentration of energy allows the Infocus torch to operate by the keyhole technique. Therefore, the aim of the present work is to study the feasibility of employing the keyhole technique with a conventional TIG torch, with the same working conditions as the torch known commercially as Infocus. The tests confirmed that the TIG process can operate by the keyhole technique, without the need for a torch with special characteristics. However, the electrode of the Infocus torch has a longer life, in comparison with a conventional electrode of the same composition, increasing process productivity.     

高强韧性焊条的研究

本文采用计算机辅助设计（ＣＡＤ）的方法，研制出一种低合金高强韧性焊条。其熔敷金属的塑性和低温韧性高，韧脆转变温度和无塑性转变温度低，扩散氢含量少，抗冷裂纹能力强，焊接工艺性能高良好，是与６８６ＭＰａ级低合金高强钢匹配的优良焊接材料，适于焊接重要焊接结构。