焊接台车在预热器产品制造技术上的应用

介绍焊接台车在回转式空气预热器产品焊接上应用和改进。     

试析A335P91＋A335P22的焊接

试分析了A335P91 A335P22钢焊接接头存在的问题，提出了在焊接工艺上解决这些问题的途径，从而确定了切实可行的焊接工艺措施。     

回转式空气预热器安装技术要点及运行中常见问题分析

回转式空气预热器的正确安装是未来良好运行的重要保障。本文介绍了锅炉配套回转式空气预热器设备的安装要点,并对运行中常见问题进行了介绍分析,为电站锅炉回转式空气预热器设备的安装和运行提供了技术参考。     

薄壁碳钢A—TIG单面焊双面成形试验研究

A—TIG焊接方法能显著增加焊接熔深。通过对薄壁碳钢进行堆焊试验，研究活性剂涂层、焊接电流、焊接速度对薄壁碳钢A—TIG焊焊缝成形的影响。选取优化后的焊接参数进行A—TIG对接焊接单面焊双面成形的工艺试验，从而实现了单面焊双面成形。     

首台国产600MW机组回转式空气预热器漏风分析及治理

本文分析了回转式空气预热器的漏风形式及漏风对锅炉燃烧影响,结合具体运行实践,探索了治理回转式空气预热器漏风的方法。     

回转式空气预热器漏风处理及实例

本文对回转式空气预热器漏风问题进行了研究和分析,得出直接漏风是空气预热器漏风的主要因素。并从直接漏风根本原因出发,介绍了空气预热器漏风常见问题及处理方法,在此基础上,结合某电厂回转式空气预热器改造实例,说明了采取正确措施减小回转式空气预热器漏风,对电厂经济性、安全性具有重大意义。     

600MW机组锅炉回转式空预器电流波动分析

通过对回转式空预器电流波动的机理进行分析,结合电厂生产实际和事故处理案例,对回转式空预器运行中可能出现的电流波动现象做一剖析,提出了各种电流波动的原因和处理方法,对电厂同类型回转式空预器电流波动的事故处理有一定的借鉴意义。     

上海锅炉厂回转式空气预热器技术进展

文中概要介绍了上海锅炉厂回转式空气预热器的技术进展。围绕热变形这一首要技术问题,归纳了回转式预热器的技术要点,介绍了改进预热器结构的关键技术措施及效果。     

回转式空气预热器运行特性影响规律的研究

针对三分仓回转式空气预热器的自身特点,建立其传热模型和传热方程式来进行计算,通过对不同物性传热元件进行计算,发现对于回转式空气预热器,材质物性对传热特性的影响不大,但受热面污染会使回转式空气预热器空气出口温度及受热面壁温下降。     

回转式空气预热器传热元件阻力特性试验研究

回转式空气预热器的阻力特性是决定空气预热器转子尺寸的主要依据之一.回转式空气预热器的阻力特性主要受传热元件结构参数影响.试验利用大型传热风洞试验系统,在模拟回转式空气预热器实际运行工况条件下,通过测量试验段整包传热元件压降,得到了传热元件摩擦因子对数与雷诺数对数之间相互关系,为空气预热器数值计算提供基础数据.通过不同类...     

Automatic welding of pipeline in Japan: Part 2—The development of a method for the branch pipe joint in ship pipeline

The pipelines used in a ship amount to tens of thousands of metres per ship, and so automatic welding of the pipelines has been widely applied from the viewpoint of saving labour. In most cases the automatic welding process has been used for the welding of butt-joints which can be applied to the pipes in rotary motion, and it has also been used for fillet-welding of the connection between flange and piping. In the butt-welding of fixed pipings, automatic welding processes are now being partly used for position welding but up to the present time automatic welding has seldom been applied to the various types of branch pipe joints in which the welded lines form three-dimensional curves.In recent years, great progress has been made in the technique of constructing steel pipe structures and in the development of practical gas cutting processes to prepare the curves needed for the various welded joints used in piping. This paper deals with various conditions and performance requirements needed for automatic welding, such as the selection of shapes of prepared edges of pipings to be welded, the control of welding positions, the control of welding torches in operation, and the solution and control of other production variables.     

全位置TIG对接焊机工艺试验研究

为提高锅炉弯管(外径φ30 mm～φ80 mm)焊接自动化程度及接头质量,上海锅炉厂有限公司引进了2台全位置TIG对接焊机.通过对几种材料、几种规格、几种不同坡口型式的管子进行的大量焊接试验,最终确定了最佳的坡口型式及焊接工艺规范参数,且获得了焊缝表面成型美观、根部焊透性好、接头质量可靠等性质优良的焊接接头,为工厂生产应用打下了基础.     

等径焊接三通自动焊的加工工艺

简要介绍了等径焊接三通自动焊的设备结构、工作原理以及典型工艺.     

Automatic welding of pipeline in Japan: Part 1—Some experiences with site applications

Recent experiments on automatic welding of pipeline in Japan have been based on the short-arc welding process and aimed at reducing the welding time by $\text{v}\text{?}$arying the welding conditions and by effecting improvements to the welding equipment.The short-arc process has been employed increasingly in the actual pipeline installation work, exhibiting a number of advantages such as stabilisation of both the quality of weld and the welding time. However, it has presented various problems, including the difficulty in jointing one elbow with another or with a cut pipe and the applicability to a narrow work site.For automatic welding of large diameter pipes for water and town gas supply, on the other hand, the electro gas process has enjoyed a broadened expanse of application by virtue of its high productivity.Further, the pulsed TIG process by programmed control was applied experimentally and produced successful results in the laying of pipe type cable pipeline.     

空冷换热器换热管-管板焊接方法及应用简介

本文介绍了空冷换热器换热管-管板的焊接方法。可采用焊条电弧焊、实芯或药芯焊丝的熔化极气体保护焊、手工钨极氩弧焊、自动化焊接等方法进行焊接。     

异种钢环缝自动TIG焊接工艺研究

低合金钢（铁素体钢）与镍基合金（不锈钢）锻件之间的异种钢对接焊缝越来越多的应用于换热设备的设计和制造过程中.自动TIG窄间隙焊接工艺已经成为异种钢对接焊缝的主要工艺方法.研究自动TIG焊接工艺,对焊接材料的选择、母材性能参数及焊接工艺等进行了介绍,通过焊接评定试验对焊接工艺进行试验论证和总结,并成功应用于换热设备异种钢环缝的焊接.     

脉冲埋弧焊技术在膜式水冷壁管屏拼接中的试验及应用

使用埋弧焊(SAW)进行锅炉水冷壁管屏生产时,如何在保证焊接质量的前提下,提高焊接速度是需要解决的技术难点.上海锅炉厂有限公司采用脉冲埋弧焊[1～2]技术,对水冷壁管屏拼接工艺进行了焊接试验和产品试生产.实践证明,脉冲埋弧焊相比常规的直流埋弧焊能提高焊接速度13%～25%,改善水冷壁管屏生产中因速度提高而产生的咬边等成形不良问题,使焊缝质量更加优良,有效地提高了焊接生产率.     

筒体总装内环缝自动焊工装设计

根据DZL系列锅炉筒体结构的特点,将埋弧焊机头安装在特定的工艺装备上,使总装内环缝实现了自动焊.     

BFe30-1-1凝汽器管子与管板焊接方法试验研究

介绍了BFe30-1-1凝汽器管子与管板一种较实用焊接方法,自熔不填丝全位置脉冲自动钨极氩弧焊焊接方法,以及以白铜BFe30-1-1为管子与管板的凝汽器材料焊接特性.通过对BFe30-1-1管子与管板,在纯氩、氢一氩混合两种不同气体保护条件下的焊接工艺试验,以及在不同气体保护下的焊接工艺参数的选择与优化,结果表明,采用自熔不填丝全位置脉冲氩弧焊焊接方法,在氢-氩混合气体保护条件下,BFe30-1-1凝汽器管子与管板焊接,焊缝成型好,质量高;以合理工艺参数匹配焊接的试验件,经各项检验均已合格,完全达到设计要求.     

Noncontact acoustic analysis monitoring of plasma arc welding

This paper addresses the problems involved in the automatic monitoring of the weld quality produced by plasma-arc keyhole welding. The acoustic signal of plasma arc welding was acquired by using a condenser microphone at high speed and analyzed with the aid of computers. It is shown that the overall AC power of the acoustic analysis, especially the low frequency part (0–100 Hz) of the acoustic signal power spectra, greatly varies with the variation of the statuses of the weld pool. A method for detecting the behaviours of the keyhole effect of plasma-arc welding was developed. The experimental results indicate that the method is a usable, practical one in the penetration quality monitoring of plasma-arc welding for on-line quality control.