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本文介绍了一种新型方波交流焊接电源,其主回路是由普通直流焊接电源和可控硅逆变器组成.该逆变器将直流转变为方波交流.直流电源的空载电压为70V,不需要特殊措施,即可保持每次电流过零后的稳定再引燃,可使10A以上的交流电弧稳定燃烧.电流的交变频率,正负半波的通电时间比,正负半波的电流比值皆可在一定范围内自由调节。工艺试验证明,利用这种电源进行铝合金钨极氩弧焊时,可控制雾化区的宽度,调节工件上的线能量,提高钨极的寿命,可以更有效地利用电弧热和力的作用来满足某些焊接工艺的特殊需要.这种电源也可满意地用来进行碱性焊条的手工焊,电弧稳定并可避免磁偏吹现象. 相似文献
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分别采用正弦波变极性和方波变极性氩弧焊对铝合金试板进行了焊接试验,利用高速摄像机和汉诺威分析仪分别对焊接过程中变极性电弧形态及电信号进行采集分析. 结果表明,电弧电压概率密度分布和高速摄像图证实了较小焊接参数条件下正弦波变极性比方波变极性电弧稳定性差的现象. 正弦波变极性TIG电弧随EP(反极性)的增加清理宽度增加,但熔宽未增加,证明此条件下正弦波变极性TIG电弧过于发散;焊接参数较大时,随EP的增加,正弦波变极性熔宽变宽,证实正弦波变极性TIG电弧稳定性随之提高,证明了铝合金变极性TIG焊接过程中EP极性电弧产热大于EN极性电弧能量的本质特征. 相似文献
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埋弧焊系统由恒流特性逆变焊接电源、送丝机、行走小车和控制器组成.控制器的输入是电弧电压Uarc和设置电压Uset,控制器的输出是PWM方式调节DC电源,驱动并调节送丝速度.用一阶微分方程建立了埋弧焊接过程中焊丝送进速度与焊接电弧之间的数学模型,模型描述了埋弧焊接过程中焊丝一边在电弧中燃烧,一边由送丝机不断送到燃弧区的平衡关系.通过电源、熔池、焊丝的热平衡分析,得到焊接系统的焊丝选取方法,该方法是焊丝直径与焊接电流的平方根成正比,文中还给出了焊丝直径与焊接电流的定量选取公式. 相似文献
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A digital arc welding power supply was designed with the advanced reduced instruction set computer machine (ARM) and embedded real-time multi-task operating system micro C/OS- Ⅱ. The ARM, with its powerful calculating speed and complete peripheral equipments, is very suitable to work as the controller of the digital power supply. The micro C/OS- Ⅱ transplanted in ARM, helps to improve the respondent speed against various welding signals, as well as the reliability of the controlling software. The welding process consists of nine tasks. The tasks of great significance on reliability of the welder, for example, the A/D conversion of current and voltage, enjoy top priority. To avoid simultaneous-sharing on A/D converter and LCD module, two semaphores are introduced in to ensure the smooth performance of the welding power supply. Proven by experiments ,the ARM and the micro C/OS- Ⅱ can greatly improve both the respondent speed and the reliability of the digital welder. 相似文献