A welding document management software package based on a Client／Server structure

According to specifications for Welding Procedure Qualification of ASME IX Section and Chinese code, JB 4708-2000, α software package for managing welding documents has been rebuilt. Coasequently, the new softuare package can be used in a Limited Area Network (LAN) with 4 different levels of authorities for different users. Therfore, the welding documents, including DWPS ( Design for Welding Procedure Specifications) , PQRs ( Procedure Qualification Records ) and WPS ( Welding Procedure Specifications ) can be shared within a company. At the same time, the system prorides users various functions such as browsing, copying, editing, searching and printing records, and helps users to make decision of whether a new PQR test is necessary or not according to the codes above as well. Furthermore, super users can also brouse the history of record modification and retrieve the records when needed.     

活性化TIG电弧光谱分布的特征

逐点测试了活性化TIG焊(A-TIG)电弧光谱的频域及空间分布，分析了A-TIG电弧光谱的构成．A-TIG光谱的频域分布为连续光谱背景下的线光谱；Ar和活性剂粒子分布在整个电弧空间，其中活性剂元素谱线在电弧中部最强，其次是钨极前方，在熔池上方最弱；活性剂元素谱线线形及重现性好；与常规TIG焊相比，电弧中的Fe谱线明显增多，大多数分布在熔池上方和电弧中部区域；电弧周围分布着很多活性剂粒子；电弧中心Ar谱线强度提高说明电弧中心温度有所提高。     

活性化TIG焊中活性剂和焊接参数对焊缝深宽比的影响

研究了在TIG焊中单一成分的活性剂 (SiO2 、CaF2 、TiO2 、Cr2 O3 、NaF)对不锈钢焊缝深宽比 (D/W )的影响 ,并针对SiO2 活性剂 ,分别研究了活性剂的涂敷量和焊接规范参数 (焊接电流、焊接速度和弧长 )对A -TIG焊焊缝深宽比的影响。试验结果表明 ,焊道深宽比随活性剂涂敷量的增加而增大 ,在所选择的五种活性剂中 ,以SiO2 的影响最为显著。涂敷活性剂SiO2 的试件 ,随着焊接电流、焊接速度和弧长的增加 ,焊缝的深宽比与无活性剂时相比有明显的增加。在TIG焊中应用某种活性剂 ,使用原有的设备就能够大幅度提高焊缝的深宽比 ,从而降低生产周期和制造成本 ,具有很好的应用前景。     

2519高强铝合金双丝GMAW焊接工艺

针对20 mm厚2519铝合金板,试验了大电流两道焊(DL)和小电流四道焊(XS)两种GMAW焊接工艺对焊缝成形和接头的力学性能的影响.结果表明,DL和XS焊接接头的抗拉强度都不足母材的60%,但DL接头的抗拉强度和伸长率比XS高而冲击韧度比XS低.综合DL和XS焊接工艺的优点,提出了新的大电流四道焊接工艺(DS).对接头的力学性能测试表明,DS焊接接头抗拉强度达到母材的61.2%,冲击韧度较DL焊接接头有所提升.DS焊缝区组织主要是α相和弥散分布的共晶组织;对接头进行硬度测试发现,焊缝区硬度最低,而由于θ相的重新固溶析出,热影响区硬度较焊缝区有明显提高.     

TIG电弧活性化焊接现象和机理研究(2)--活性化TIG焊接中的电弧现象

在变动焊接电流下检测电弧电压,考察Ａ－ＴＩＧ焊电弧收缩及活性剂的影响。结果表明,Ａ－ＴＩＦ焊电弧收缩是焊接熔深增加的一项重要原因,电弧是否产收缩与所使用的活性剂有前关,然而,既使在电弧未产生收缩情况下,表面活性剂仍然对焊接熔深的增加有较大作用。     

GTAW熔池谐振法熔透控制技术

分析了熔透控制技术的发展现状,提出了利用熔池谐振技术进行熔透控制的方法,并对其原理、传感技术、实时控制系统和控制结果进行了讨论。该技术为熔透控制技术的实际应用提供了一个新的途径。     

连续行走脉冲TIG焊熔池谐振法熔透控制

熔池振荡频率与熔池尺寸之间的良好对应关系,可以用于进行熔池尺寸检测及熔透控制,但在快速行走焊接时难度很大。本文在恒定直流之上叠加定频率正弦波电流做为脉冲焊接电流激振熔池,在连续行走焊接时,通过电弧电压检测熔池振荡即熔池尺寸。在脉冲电流作用期间,随着熔池尺寸的增长,当熔池自身固有振荡频率与焊接电流正弦波频率一致时,熔池产生谐振,从电弧电压中检测到谐振特征变化信号,该信号的强度,稳定性,重复性及与熔池     

基于μC/OS Ⅱ的变极性焊接电源的研制

运用μC/OS Ⅱ嵌入式实时操作系统和双DSP硬件控制电路,设计了一套变极性焊接电源系统,并针对嵌入式操作系统的系统结构、硬件电路设计、软件移植和应用程序开发等方面进行了研究.试验分析表明,该设计方案系统动态响应速度快,控制程序能够可靠运行,可以满足系统设计要求.     

Metal transfer characteristics of tandem narrow gap GMAW for flat welding position

A series of experiments of tandem narrow gap GMAW for flat welding position were carried out. The arc behavior and metal transfer process were observed by a high-speed photography system. The effects of the welding parameters on the metal transfer were investigated. The results show that the arc behavior and metal transfer process of tandem narrow gap GMAW are different from these of bead-on-plate tandem GMAW. The arc behavior and metal transfer process are influenced by the distance between the two wires, the peak voltage, the pulse frequency and the peak time. With the increase of the distance between the two wires, the metal transfer mode gradually transforms from one pulse-multi droplets into one pulse-one droplet, and the average welding current increases. With the increase of the peak voltage, pulse frequency or peak time, the metal transfer mode transforms from one pulse-one droplet into one pulse-multi droplets, and the arc tends to occur between the wire and the sidewall.     

TIG welding-brazing joint of aluminum to stainless steel with hot wire

TIG welding-brazing process with high frequency induction hot wire technology was presented to create joints between 5A06 aluminum alloy and SUS32! stainless steel using ER1100 filler wire with different temperature. The joints were evaluated by mechanical test and microstructural analyses. The welding procedure using hot fiUer wire （400 ℃ ） significantly increases strength stability by 71% and average value of tensile strength by 30. 8 % of the joints, compared with cold wire. The research of microstructures in interfaces and welded seams reveals that using 400 ℃ hot filler wire can decrease the thickness of intermetallic compounds （ IMCs ） from 6 to 3.5 txm approximately, which is the main reason of mechanical property improvement.