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。     

Mathematical model and simulation of partial penetrated weld pool

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不锈钢TIG熔钎焊接头微观组织及力学性能

采用高温铜基S211和S201焊丝对不锈钢进行了TIG熔钎焊试验,运用OM,SEM,EDS分析了接头微观组织,通过拉伸试验评定了接头力学性能.结果表明,不锈钢接头具有熔焊与钎焊的双重性质,不锈钢上部靠近电弧区熔化,存在一个α ε相熔合区;下部不锈钢未熔,为钎焊结合;焊缝基体为Fe在Cu中的过饱和固溶体相,基体上存在大量尺寸不等的α ε相高温颗粒,焊缝区上部含高温颗粒多,下部含量少.两种接头均断裂于焊缝区,S211焊丝接头强度要高于S201焊丝,分别达到498.33 MPa和476.67 MPa,而S201焊丝接头的断后伸长率要高于S211焊丝,分别为19.6%和13.8%.     

TIG焊变频电流下熔池谐振检测与研究

建立基于弧光传感的试验系统,在定点电弧在连续行走电弧下,利用频率线性变化的变动焊接电流对薄钢板ＴＩＧ焊熔池进行激振,当熔池固有振荡频率同激振电流频率一致时,熔池发生谐振。通过对电弧弧光采样数据幅值提取,检测出熔池振荡特征信号并可证明为熔池谐振信号,可用于实时判断焊接熔池尺寸信息,为解决连续行爱控制开辟了一条新途径。     

超声对等离子电弧的影响及焊接试验研究

随着现代工业生产技术的发展,超声波在材料加工领域应用越来越广泛,相继出现了多种超声波与焊接相结合的方式,在一定程度上提高了焊接质量和生产效率,增强了焊接的适应性。详细介绍了一种超声电弧技术,即利用外加超声源调控等离子电弧作为相应热源进行焊接的技术。电弧试验研究显示,受超声调制的等离子电弧呈规则的圆锥形,压缩明显,电弧中心区压力增大。在焊接试验中,发现施加超声后,焊接熔滴尺寸更小,过渡频率明显增加,焊缝的熔宽和熔深都不同程度增加。利用该方法可以克服普通电弧焊接熔深浅、电弧能量不集中、焊接效率低等缺点。     

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.