节电大于30%的逆变弧焊机

北京同方-爱尔通焊机有限公司批量生产的凯瑞(Carry-Weld)350系列焊机于今年第二季度投放市场以来,受到广大用户的欢迎。该公司是由清华大学同方新技术开发公司与瑞士爱尔通公司合资组建的,采用爱尔通公司的技术与管理体系专门生产该公司于80年代开发的新一代的、机电一体化的、高效节能的逆变弧焊机。 凯瑞350系列变弧焊机采用高技术晶闸管技术,是当前国际上一种技术成熟与先进的产品,在工业发达国家获得了广泛的应用,成为国际上电焊     

直流焊机熄弧断电自动开关

<正> 用交流电机拖动的直流焊机熄弧启动开关,安装在 AX7—500型直流焊机上的使用结果表明,节电效果显著:按暂载率50%计算,每月单班可节电2000度左右。这套自动开关有原理简单、使用方     

可控硅逆变焊机全集成控制系统的研究

详细地介绍了可控硅逆变焊机的一种全新控制模式——全集成控制;分析了触发脉冲产生过程、空载电压建立过程、外特性的实现、逆变器的可靠性及直流脉冲焊控制等,并对工艺试验结果进行了分析。     

逆变技术在焊接节能中的应用

弧焊逆变器与传统的弧焊机相比主要体现在省料和节能这两个方面，其中又以场效应管弧焊逆变器更胜一筹。本通过分析弧焊逆变器的工作原理和比较弧焊逆变器与传统弧焊器在焊接中电耗，说明了逆变技术在焊接中节能的效率及应用前景。     

可节电约30%的逆变焊机

逆变焊机的铁芯元件是用非晶态合金制造的,我国已用冶金部钢铁研究总院生产的非晶态合金制造了1万个铁芯元件,并用其生产了1万台逆变焊机。这种电焊机的重量     

穿孔机顶杆焊接工艺

顶杆材质为３５＾＃、４５＾＃及３９ＮｉＣｒＭｏｘ，选用Ｅ５０１５焊条，ＡＸ－５００型直流弧焊机。介绍装配技术要求，定位焊时注意事项，预热和热自理焊接工艺规范参数和焊接操作方法。     

氩弧焊机改造激光电弧复合焊机实践

传统不锈钢连轧机组氩弧焊机焊缝强度低,焊缝余高超高,无法过轧机轧制。通过对比激光焊和激光复合焊的优缺点,某厂不锈钢DRAP机组将氩弧焊机改造为激光电弧复合焊机,该激光电弧复合焊具有自导向功能、大容差和高稳定性的特点,使成材率得到大幅提高。     

一种焊接机冷却系统停水保护装置的应用

大功率氩弧焊机的焊枪都需要循环水冷却,循环水不畅将造成焊枪烧毁,本文介绍了一种氩弧焊机冷却系统停水保护装置,它能很好的解决停水烧抢这一老大难问题,具有一定的推广意义。     

直流钢包炉技术的发展与应用

本文综述国内外直流钢包炉技术研究与开发现状，并探讨直流钢包炉（ＤＣＬＦ）发展方向；作者提出重视磁镜式双放弧电极直流钢包炉在我国应用的问题。     

直流电弧炉偏弧控制的研究

８０年代以来,直流电弧炉炼钢技术得到很大发展,并且呈现取代交流电弧炉的趋势。但在高功率直流电弧炉中,直流电弧的偏弧问题给其运行带来很大危害。直流电弧炉的偏弧现象是由电弧炉内电磁场的分布情况决定的,针对底电极为４根水冷钢棒的直流电弧炉,本文提出了电弧位置闭环自动控制的方法。首先在三维导体布置下建立直流电弧的偏弧模型。直流电弧在炉体内受到的使其产生偏移的电磁力为Ｆ磁＝∫ＺｔＺｃｄＺ‰ＳｊＺ×ΣＮｋ＝１Ｂｋｄｓ式中　Ｚｔ———石墨电极端头的Ｚ轴坐标值;Ｚｃ———钢水液面的Ｚ轴坐标值;ｓ———电弧柱的截…     

Properties of the welded joints of manganese steel made by low-frequency pulsed arc welding

The structure, the mechanical properties, the impact toughness, and the fracture mechanisms of the welded joints made of steel 09G2S plates by direct current welding and pulsed arc welding with a modulated arc current in the frequency range 0.25–5.0 Hz are studied. The application of low-frequency pulsed arc welding allowed us to form welded joints with a fine-grained structure in the weld metal and the heat-affected zone and to achieve a higher impact toughness and a longer cyclic fatigue life as compared to the welded joints fabricated by direct current welding. The achieved effect manifests itself over the entire testing range from 20 to–60°C.     

变极性电弧焊接的电流换向过程影响因素试验研究

采用基于反向再燃弧电压产生电路的变极性焊接电源为试验平台,研究了电源设备及其控制参数、焊接回路电缆寄生电感和焊接工艺参数对变极性焊接电流换向过程的影响规律. 试验结果表明,提高反向再燃弧电压值能够提升变极性过程的电流变化速率,而较大的焊接回路电缆寄生电感会降低电流变化速率,同时降低变极性结束时的电流值,不利于变极性过程的电弧可靠再引燃和稳定燃烧. 初始焊接电流越小,则变极性过程结束时的电流值越小,增加共同导通时间可以提高变极性结束时的电流值,但同时降低变极性开始时的电流大小. 因此小电流变极性焊接时可采用较大的反向稳压值并适当增加共同导通时间,以增强变极性过程中的电弧稳定性.      

05CuPCrNi钢等离子弧焊焊接接头的组织与力学性能

 为了研究等离子弧焊在焊接薄板耐候钢时的优越性,对2 mm厚 05CuPCrNi耐大气腐蚀钢分别进行等离子弧焊与MAG焊(熔化极活性气体保护电弧焊)对接焊接,然后对焊接接头分别进行拉伸、弯曲、金相、硬度等试验,通过与MAG焊焊接接头的组织与力学性能对比,结果表明,与MAG焊相比,等离子弧焊时05CuPCrNi耐大气腐蚀钢焊接接头强度相对提高约6%,焊接接头组织为更均匀且细小的铁素体＋珠光体,并无MAG焊中出现的粗大块状铁素体及贝氏体,焊接热影响区较小,焊接接头弯曲性能良好,硬度值及硬度分布情况与MAG相近且无软化现象。     

Effect of Autogenous Arc Welding Processes on Tensile and Impact Properties of Ferritic Stainless Steel Joints

 The effect of autogeneous arc welding processes on tensile and impact properties of ferritic stainless steel conformed to AISI 409M grade is studied. Rolled plates of 4 mm thickness have been used as the base material for preparing single pass butt welded joints. Tensile and impact properties, microhardness, microstructure, and fracture surface morphology of continuous current gas tungsten arc welding (CCGTAW), pulsed current gas tungsten arc welding (PCGTAW), and plasma arc welding (PAW) joints are evaluated and the results are compared. It is found that the PAW joints of ferritic stainless steel show superior tensile and impact properties when compared with CCGTAW and PCGTAW joints, and this is mainly due to lower heat input, finer fusion zone grain diameter, and higher fusion zone hardness.     

Research on the Welding Process of 590MPa Grade High Strength Automobile Beam Steel

590 MPa automobile beam steel strips are used mainly to manufacture the longitudinal beam of trucks.It’s welding properties are critical to the safety of truck.The microstructure and mechanical properties of welding joints processed by CO 2 arc welding with different welding parameters were studied.The results showed that the welding joints were weak when welding heat input were small and the non metal inclusions were found in the weld joints when welding heat input are big.The quality of the welding joints is good enough at 170A of the arc current and 24V of the arc voltage.Keeping the other welding parameters fixed,the incomplete fusion defect occurred in the welding joint with backward welding,but the quality of the welding joint is good with forward welding.     

双电弧集成冷丝复合焊中冷丝位置对焊接过程的影响

搭建了双电弧集成冷丝复合焊接系统,研究了冷丝不同位置对焊接过程的影响机理,其中包括冷丝作用位置对其加热熔化作用及表面成形的影响。实验结果表明:冷丝从两引导焊丝正前方送入时,熔池前端对冷丝的加热熔化作用不充分,冷丝末端会顶触熔池底部,随着冷丝的持续送进和母材的向后移动,某一时刻冷丝回弹,焊丝末端的熔滴弹出落在母材表面形成大颗粒飞溅。当冷丝从侧面送入时,熔池一侧的温度较低,影响熔池金属的流动,导致最终的焊缝成形不对称分布。当冷丝从两引导焊丝正后方送入熔池时,冷丝始终插入熔池中,焊接过程稳定,是理想的冷丝作用位置。此外,随着冷丝送丝速度的增加,两种脉冲电流模式（同相和反相）下,熔敷率均随之增加,且相差不大。同相脉冲电流下电弧对冷丝的加热熔化作用最强烈,反相脉冲电流下次之,直流模式下最弱。      

Mechanism of Action of Rare Earths in High Effective Fe Powder Welding Rods

The optimum coating composition of alkali Fe powder welding rods was designed by orthogonal experiment with mix rates. A new kind of effective RE-Fe powder welding rod was prepared which could be used at the condition of direct and indirect current. The arc characteristics and stabilities of effective Fe powder welding rods containing RE were analyzed by HANNOVER analyzer. The efficiency of Fe powder welding rods was tested by weighting method. It wag found that the stability of Fe powder welding rods Wag improved when it was added with rare earths. The results of impact experiment at low temperatures and SEM analysis on impact break showed that the grain was refined, the welding joint was cleaned, and the mechanical properties of joint was enhanced with proper RE content. It was provided with good processing property for this effective RE-Fe powder welding rod, and its efficiency could arrive at 180%.     

Analysis of Metallurgical and Mechanical Properties of Continuous and Pulsed Current Gas Tungsten Arc Welded Alloy C-276 with Duplex Stainless Steel

The present work investigates the microstructure and mechanical properties of alloy C-276 fabricated by continuous and pulsed current gas tungsten arc welding process and by employing ER2553 filler wire. Optical and scanning electron microscopic analyses were carried out to study the microstructures of weldments produced. Energy dispersive X-ray spectroscopy (EDS) was performed to investigate the formation of secondary phases in the weldments. The results disclosed that pulsed current gas tungsten arc welding showed refined microstructure compared to continuous current gas tungsten arc welding. SEM/EDS analysis revealed the segregation of Mo in the weld interface regions in both the welding techniques. The extent of microsegregation reduced the strength and toughness of the weld joint compared to the base metal. Bend test revealed cracks in the weld interface region in both the weldments.     

K-TIG焊接中厚板的工艺窗口改进

针对穿孔深熔氩弧焊(K-TIG)工艺焊接8 mm厚Q235低碳钢板时焊接过程不稳定、焊接工艺窗口小等突出问题,首次提出在焊接工件背部铺加保护焊剂的方法改善焊接过程。采用对接焊的方式,在不开坡口、焊接过程不添加焊丝的情况下,达到单面焊双面成形的效果。最终成功的采用430～480 A范围内的直流电流对8 mm厚的Q235低碳钢进行了焊接,将焊接电流窗口扩大到50 A同时也显著的提高了焊接过程的稳定性。同时,在扩大焊接电流窗口之后,系统研究了不同焊接电流下焊接接头的组织性能。研究结果表明:在不同焊接电流下得到的焊接接头中,组织分布以及力学性能分布呈现出相同的状态。焊缝区的组织均由铁素体+珠光体+魏氏组织组成;熔合区由魏氏组织组成;热影响区由铁素体+少量的珠光体组成;此外随着焊接电流的增加,焊接接头背部的熔宽有略微增加;在焊接接头中,熔合区处硬度值最高,其次是焊缝区,之后是热影响区,母材的硬度值最低;焊接接头最终的拉伸断裂位置是在热影响区处。      

Light Band Zone Formation and its Influence on Properties of Magnetically Impelled Arc Butt (MIAB) Welded Carbon Steel Tubes

Magnetically Impelled Arc Butt (MIAB) welding is a solid state welding process especially used in circumferential butt welding of tubes in which heat is generated prior to upsetting by an electric arc moving along the peripheral edges of the weldment with the aid of an external magnetic field. This paper aims at studying the formation of Light Band (LB) zone and its effect on the weld properties of MIAB welding of carbon steel tubes. A detailed microstructural analysis has been carried out to understand the microstructural transformations taking place in Thermo-Mechanically Affected Zone leading to formation of LB zone. Welded samples show better tensile properties with higher upset current as it eliminates LB zone formation at weld interface. For lower upset current, width of the LB zone increases with increase in arc rotation current resulting in lower weld tensile strength.