减少CO2气体保护焊飞溅的措施

CO2气体保护焊是一种非常高效并且节能的明弧焊接方式,因其拥有生产效率高、耗能低、熔敷率高并且适用范围非常广等优点得到了非常广泛的应用。但是应用CO2气体保护焊进行焊接时容易发生飞溅,尤其是焊接的工艺参数有不当的设置之处时,飞溅现象会明显加大。这对焊接的稳定性以及焊接的结构件质量都会产生很大的影响。本文主要分析CO2气体保护焊产生飞溅的原因以及减少飞溅的措施,希望能给应用CO2气体保护焊焊接的工作人员提供一些借鉴。     

CO2气体保护焊飞溅问题的探讨

本文阐述了CO2气体保护焊产生飞溅的原因,提出了减少飞溅的措施。     

减少CO2气体保护焊焊接飞溅的措施

分析了CO2气体保护焊飞溅产生的原因,从焊接工艺参数、焊接材料、电流电压波形控制等角度介绍了控制飞溅的新成果。超稳定化、定量化和数值化是焊接飞溅控制研究的发展方向。     

CO2气体保护焊产生飞溅的原因及控制措施

熔滴飞溅是CO2气体保护焊影响生产效率、焊接稳定性和焊缝质量的主要因素。大滴过渡和短路过渡都会产生飞溅。分析飞溅的成因,采取有针对性的控制飞溅的有效措施,采用合理的焊接工艺、选择合理的焊接工艺参数降低飞溅率,对CO2气保焊有着十分重要的意义。     

CO2焊的波形控制法

用波形控制方法改善CO2焊焊接品质是当今国内外焊接界的热点课题,本文分析CO2焊飞溅产生及焊缝成形差的原因,叙述CO2短路过渡焊理想的电流电压波形,列举典型的波形控制法,最后对CO2焊波形控制法的发展前景做出展望。     

CO2气体保护焊飞溅产生的原因及减少措施

CO2气体保护焊是一种高效率焊接方法，并具有生产效率高、焊接成本低、能耗低及适用范围广等优点，因而被广泛的应用于我公司设备修理（主要是电解槽大修）及零配件加工等领域。但采用CO2气体保护焊时易产生飞溅，这对于焊接过程的稳定及焊接结构件的质量有显著影响，为此，本文就CO2气体保护焊产生飞溅的机理和减少飞溅的措施进行了阐述，希望能为使用CO2气体保护焊的工作人员提供借鉴。     

联合收割机车身骨架CO2保护焊的缺陷及控制

联合收割机车身骨架构件的壁厚一般小于2mm，采用二氧化碳气体保护焊(简称CO2焊)虽然具有较多优点，但也会产生各种缺陷。较常见的是气孔、飞溅过多和焊缝加厚加高。CO2气体保护焊的焊接质量与保护气体、工艺参数及骨架构件都有关系，下面对这三个方面进行分析。     

IGBT逆变弧焊电源CO2气体保护焊飞溅的波形控制

随着逆变焊机的发展和数字技术的应用,逆变CO2气体保护焊电源可通过调节焊接电源输出的电流与电压来控制熔滴过渡,改善焊缝成形,降低飞溅.根据熔滴过渡不同阶段的要求产生电流与电压控制信号,进行波形控制可实现调节短路电流上升速度,以减小短路峰值电流,降低短路爆炸能量;减少瞬时短路的次数;通过短路后期液桥颈缩电压上升率切断短路电流,消除电爆炸能量.以此有效减少CO2气体保护焊短路过渡产生的飞溅量,为低飞溅CO2气体保护焊的设计与实现提供有力保证.     

减少CO2气体保护焊金属飞溅的措施

CO2气体保护焊有很多优点,但是由于金属飞溅严重,使其在推广应用中受到很大影响.解决CO2气体保护焊金属飞溅的问题,可从焊接工艺参数和焊接材料等方面考虑,本文基于飞溅形成的机理和实际经验,提出了一些减少飞溅的措施.     

减少电弧焊接飞溅的方法

金属极惰性气体保护焊(MAG)以及CO_2焊是汽车工业应用广泛的焊接工艺,其焊接质量的好坏,直接影响汽车产品的优劣,甚至影响市场竞争能力。CO_2焊、MAG焊虽具有众多优点,但也存在飞溅量大而影响工艺操作及质量等问题。本文主要分析上述两种焊接法飞溅产生的原因及其抑制对策,介绍了较为典型实用的方法。     

Experimental Study on Metal Transfer and Welding Spatter Characteristics of Cellulose Electrode

Welding spatter cause many problems during the welding process and this issue is particularly important for cellulose electrode welding.The hot flying spatter balls often deteriorate the working environment,and decrease the welding efficiency.Many factors affect the welding spatter,and metal transfer behavior is one of the main factors.Many studies concerning the spatter mechanism in arc welding process were made;most of them focused on the solid wire welding and the study on cellulose electrode is rarely reported.In this paper the metal transfer behavior and the weld spatter characteristics of three commercial cellulose electrodes were studied experimentally by using a high speed camera for visually capturing the metal transfer.The relationship between the metal transfer and the welding spatter was analyzed experimentally by comparing the spatter loss coefficient,which is for quantitative evaluation of welding spatter,with the statistical analysis of the large droplet transfer mode.The results showed that short circuiting transfer,large droplet spray transfer,fine droplet spray transfer and explosive transfer govern the metal transfer modes in cellulose electrode welding.Weld spatter occurred mainly in the deflection of large droplet process,explosive transfer process and fine droplet spraying process.Different metal transfer modes lead to different spatter.The deflection of large droplet and explosive transfer are the main factors of the spatter formation.Minimizing the droplet size and reducing the deflection of large droplet and explosive transfer leads to the reduction the amount of spatter in cellulose electrode welding.     

EXPERIMENTAL STUDY ON METAL TRANSFER OF CELLULOSE ELECTRODE IN VERTICAL DOWN WELDING

A high-speed photographic method is mainly used to analyze metal transfer of a cellulose covered electrode in the vertical down welding. The experimental results show that fine droplets spraying transfer and globular transfer are the dominant transfer characteristic. The large droplet spatter, especially the upwards spatter, is a particular phenomenon. It is found that the combination action of gas blow force, surface tension, gravitational force and electromagnetic force lead to globular transfer. Gravitational force and electromagnetic force, which hasten big droplet spatter, should not be neglected.     

自保护硬面药芯焊丝药芯成分对焊接飞溅的影响

用正交试验法探讨了自保护硬面药芯焊丝药芯粉中金红石、氟化物、硅灰石、氧化锆和镁砂对焊接飞溅的影响,对含氮自保护硬面药芯焊丝药芯粉的最佳配比进行了优化.结果表明:随着药芯中氟化物、氧化锆含量的增加,焊接飞溅增大;随着药芯中金红石、硅灰石和镁砂含量增加,焊接飞溅减少;当金红石、氟化物、氧化锆、镁砂和硅灰石质量分数分别为8.0%,4.0%,4.0%,5.0%和2.0%时,含氮自保护硬面药芯焊丝焊接工艺性能最佳.     

含钒高铬铸铁自保护金属芯堆焊焊丝的研制

研制了一种自保护金属芯堆焊药芯焊丝。堆焊过程飞溅小，焊缝成型美观。堆焊层组织为马氏体＋残余奥氏体＋碳化物硬质相。堆焊层硬度为HRC60，相对耐磨性为Q235钢的21倍。焊丝的熔滴过渡方式为典型的短路过渡。研究焊丝粉芯成分对焊丝的性能发现，石墨可以有效的降低飞溅，当粉芯中的石墨含量为3％时，堆焊过程中的飞溅率最低，此外增加粉芯中钒的含量，堆焊层的硬度和耐磨性上升。     

磁控技术在焊接中的应用及进展

介绍了电磁作用焊接技术的原理及特点，阐述了目前国内外磁控技术在改善金属的结晶组织及提高熔敷金属的各项性能，减小残余应力和在激光焊接中的应用及进展，研究了外加磁场对CO2焊短路过渡的控制，在一定的焊接规范下，外加纵向磁场能有效地抑制CO2焊短路过渡中的飞溅，获得较好的工艺效果，存在一个最佳的磁场范围，在这个范围内，控制飞溅的效果较佳。     

Laser drilling assisted with jet electrochemical machining for the minimization of recast and spatter

Laser drilling is increasingly becoming the method of choice for precision drilling for a variety of components. The most important application is the drilling of fine cooling holes in aero turbine engine components such as nozzle guide vanes and blades. However, a number of defects such as recast, spatter and heat-affected zone limit the application. The elimination of these defects is the subject of intense research. This paper presents a novel hybrid process of laser drilling assisted with jet electrochemical machining (JECM-LD) which can minimize the recast and spatter. The process is based on the application of a jet electrolyte, being aligned coaxially with the focused laser beam, on the workpiece surface. The effects of the jet electrolyte during the process mostly consist of electrochemical reaction, effective cooling with materials and transporting debris. JECM-LD experiments were performed on 0.5-mm thickness 321 stainless steel with pulsed Nd:YAG laser at second harmonic wavelength. The optical microscope and scanning electron microscope were used to detect the experimental results. It is found that the spatter has been reduced more than 95%, and recast has been reduced more than 90% during the JECM-LD compared with laser drilling in ambient atmosphere conditions.     

低碳钢薄板的二氧化碳气体保护焊实践

以常见的低碳钢薄板(Q235)的焊接为例,介绍了焊接方法的确定、焊接设备、焊接材料及焊接参数的合理选择;分析了飞溅问题造成的影响及预防措施。     

Impacts of external longitudinal magnetic field on arc plasma and droplet during short-circuit GMAW

In gas metal arc welding, electromagnetic force, plasma stream force, gravity, and surface tension are the most important factors that affect metal transfer and spatter generation rate. In this paper, different kinds of external electromagnetic fields were introduced to gas metal arc welding (GMAW). The photos of arc plasma and droplet and electric signals covering welding current and arc voltage were acquired synchronously by an analysis and evaluation system based on LabView for GMAW. It was confirmed that the metal transfer frequency was improved, and spatter generation rate was diminished under controls of external electromagnetic fields. The influencing rules of external electromagnetic fields on electromagnetic force, the gravity, the plasma stream force, and surface tension were studied by three physical models, and the mechanism of external electromagnetic fields was revealed. This paper is for the purpose of discussing these factors and will make a profit for the application of electromagnetic coupling control to short-circuit GMAW.     

CO2气体保护焊短路过渡与电弧电压关系的研究

针对CO2短路过渡气体保护焊过程中的飞溅问题，通过焊接质量分析仪采集电压、电流动态信息，找到与飞溅相关的熔滴缩颈、熔滴短路和熔滴小桥爆断时刻的标志信息，为短路过渡气保焊过程在线监控提供高品质的信息源。