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。     

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.     

CO2气体保护焊电弧现象中对焊丝添加稀土金属的影响研究

一、概述 CO2气体保护焊（以下简称CO2焊）开发于20世纪50年代,由于焊接电源和焊接材料的改进,近年来这种焊接方法已发展成为主流焊接法,但是CO2焊会在熔滴自由过渡时产生较多的飞溅,因此,目前已把降低飞溅作为一个专门的研究课题。本文针对CO2焊电弧现象和焊丝成分的影响进行研究。关于CO2焊有资料报道：焊丝中碳含量降低,而钛含量增加,可以有效地抑制短路过渡的飞溅,但是效果不明显。     

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。     

IGBT逆变电源CO2气体保护焊低飞溅的控制与实现

针对CO2气体保护焊焊接过程存在的飞溅大、成形差的缺点,以IGBT逆变弧焊电源为基础,对CO2焊短路过渡过程的动态信息参数电压、电流、信号进行分析、研究,确定了通过短路过程电弧的电参数来判别短路开始、颈缩、重新燃弧等不同阶段的信号源。结果表明:基于IGBT逆变CO2电源的电流波形控制,能够实现电流波形的分段精细控制,达到稳定焊接过程,减小飞溅,改善焊缝成形的目的。     

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。     

基于80C196KC的CO2焊逆变电源数字波控系统

论述了基于Intel 80C196KC 16位单片机控制基础之上,采用波形控制的CO2焊逆变电源机系统,包括系统构成、电流波形控制策略、参数设置与显示、送丝及时序控制等.该系统根据CO2焊短路过渡的特点,软件上采用各种灵活措施对CO2焊焊接电流和电压波形进行较为精确的控制.并给出了该系统短路过渡CO2焊焊接电流电压波形.试验结果表明本CO2焊逆变电源数字控制系统具有良好的控制性能,而且结构简单和容易操作.     

CO_2短路过渡焊电弧电压的模糊控制

根据 CO2 短路过渡焊的电弧电压只有与焊接电流形成最佳匹配 ,短路过程才最稳定 ,飞溅量也较少的特点 ,利用模糊控制原理设计了一种以焊接电流为设定参数能够对电弧电压自动寻优的控制系统 ,真正实现了主要规范参数的一元化控制     

自组织模糊控制CO2弧焊逆变电源

本文介绍了一种新型CO2弧焊逆变电源。本电源从电弧物理过程出发,运用表面张力过渡理论控制焊接电流波形以减少CO2焊接时的飞溅。根据自组织模糊控制的基本原理设计了一种模糊控制器,用于实现表面张力过渡焊的电压电流波形。在进行短路过渡CO2焊接时能明显减少飞溅,同时改善焊缝成型。     

逆变波控高速焊系统的研究

介绍了逆变波控高速焊系统的总体结构和功能以及其控制系统和控制软件的设计，并通过试验进行验证。试验结果表明，通过对焊接电流波形的控制，可有效解决短路过渡气体保护焊的焊缝成形差及焊接飞溅大的缺点，实现高速焊过程。     

CO2弧焊熔滴过渡过程的特征及其定量评价

研究了ＣＯ２焊接熔滴短路过渡特征参数及其统计规律，结果表明各特征参数对ＣＯ２焊接短路过渡过程变化的敏感程度不一致，某些特征参数的敏感性比短路过渡频率更强烈。为综合考虑这些参数的影响，以特征参数综合值来描述和实时评判ＣＯ２焊接短路过渡过程，得到一个能全面定量描述和评判ＣＯ２焊接过程的综合评价函数。试验和评判表明，该评价函数能够对ＣＯ２焊接短路过渡过程的不同规范状态给予综合评价。     

CHARACTERISTICS OF DROPLET TRANSFER IN CO2 LASER-MIG HYBRID WELDING WITH SHORT-CIRCUITING MODE

LF6 aluminum alloy plates with 4.5 mm thickness are welded in this experiment.Welding is carried out by using the CO2 laser-MIG paraxial hybrid welding in flat position. The experimental results indicate that the inherent droplet transfer cycle time of conventional MIG arc is changed due to the interaction between CO2 laser beam and MIG arc in the short-circuiting mode of laser-MIG hybrid welding. Because of the preheating action of CO2 laser to electrode and base material, the droplet transfer frequency of MIG arc is increased in the hybrid welding process. When laser power is increased to a certain degree, the droplet transfer frequency is decreased due to the effect of laser-induced keyhole. Furthermore, through analyzing the MIG welding current and arc voltage waveforms and the characteristics of droplet transfer in the hybrid welding process, the effect of laser energy and the action point between laser beam and arc on the frequency of droplet transfer and weld appearance is investigated in details.     

协同式CO_2焊短路过渡模糊控制系统研究

介绍了一种在波形控制基础上,采用电弧自身传感的协同式模糊　控制方法对焊接过程参数进行实时控制的逆变式ＣＯ２焊机控制系统。它通过电弧自身传感　对ＣＯ２焊接过程有重要影响的短路过渡频率的检测,通过模糊处理和模糊判决之后,实时　的对电弧电压进行控制,以保持焊接过程中规范参数的协同匹配关系。试验结果表明,采用　该控制系统的焊机,实现了焊接规范参数的自动匹配和自动调节,同时明显改善了焊缝成形　和降低了焊接过程中的飞溅。     

药芯焊丝CO2气体保护焊熔滴过渡形态观察分析

采用高速摄影技术和汉诺威焊接参数分析仪,对国内外代表性的药芯焊丝CO2焊的熔滴过渡过程、电弧行为、飞溅、烟雾等电弧物理现象进行了大量的观察,总结了各种药芯焊丝熔滴过渡形式和电弧行为的特点,对各种过渡形式工艺性进行了初步评价。     

DETECTION AND ANALYSIS OF WELD POOL SHAPE FOR CO2 SHORT CIRCUITING ARC WELDING

0 INTRODUCTIONIt is well known that skilled welding operatorscan estimate and control beam quality by mainlyobServing the weld POOl. This means the POOl im8gecontains abundant inforTnation during weldprocess. So that, sensing information from POOl imeqedirectly is becoming a new method to control the weldquality.Following the advances in computer vision andM camera tecbnoogy, more and more researchesusing weld opl image for sensing welding processeshave been carried out, usually in T…     

Effect of laser on the welding process of short-circuiting transfer MIG welding of aluminum alloys

In this paper, the effect of laser on the welding process in metal inert gas (MIG) welding of aluminum alloys was studied exploiting high-speed imaging and welding electrical signals collecting. Bead-on-plate welding experiments were conducted using conventional short-circuiting transfer MIG welding and laser-short-circuiting transfer MIG hybrid welding. The obtained results point out that it took less time to strike the arc in laser-MIG hybrid welding, and the stability of arc striking was increased. When the laser was introduced into the arc atmosphere, the arc was compressed, and the welding energy was more concentrated. The arc cathode spot was fixed to the laser beam impinging spot, so the arc could burn stably. In laser-MIG hybrid welding, the droplet short-circuiting transfer stability and the weld appearance were improved significantly. Moreover, an analysis method of judging droplet transfer stability which bases on statistical techniques was proposed. By this method, it can be concluded that the short-circuiting transfer process became more stable in laser-MIG hybrid welding.     

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.     

大型钢制球罐的高效自动焊关键技术研究

就大型钢制球罐自动焊的关键技术进行了深入研究,采用CCD光电测控技术解决了球罐多层多道焊的实时跟踪难题,采用柔性磁轮式机构解决了焊车在球罐上无导轨全位置自由行走的难题,并试验研究了用CO2气体保护药芯焊丝焊(FCAW)进行球罐全位置多层多道焊的工艺技术。在此基础上,研制成了一种5自由度的全位置焊接机器人,能对球罐内外纵缝、横缝及仰缝进行无导轨全自动焊接,达到了高效率、高质量、无人实时操作和低劳动强度。