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春兰, 韩永全, 陈芙蓉, 洪海涛. 铝合金脉冲变极性等离子弧焊接工艺[J]. 焊接学报, 2016, 37(1): 29-32.
引用本文: 春兰, 韩永全, 陈芙蓉, 洪海涛. 铝合金脉冲变极性等离子弧焊接工艺[J]. 焊接学报, 2016, 37(1): 29-32.
CHUN Lan, HAN Yongquan, CHEN Furong, HONG Haitao. Pulse variable polarity plasma arc welding technology of aluminum alloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2016, 37(1): 29-32.
Citation: CHUN Lan, HAN Yongquan, CHEN Furong, HONG Haitao. Pulse variable polarity plasma arc welding technology of aluminum alloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2016, 37(1): 29-32.

铝合金脉冲变极性等离子弧焊接工艺

Pulse variable polarity plasma arc welding technology of aluminum alloy

  • 摘要: 研发了一种单电源双脉冲混合调制VPPA(variable polarity plasma arc,VPPA)焊接系统,在典型VPPA焊接基础上加入高低频调制脉冲,可输出1~5 kHz高频脉冲,1~2 Hz低频脉冲及高低频混合脉冲. 以3003铝合金为试验对象,采用脉冲VPPA焊接方法,对其进行焊接试验,并通过焊接接头拉伸性能测试、显微相组织分析及断口扫描电镜等手段对铝合金的焊接质量和接头性能进行了分析. 结果表明,由于高低频混合脉冲电流的周期性变化,对熔池产生搅拌、冲击作用,从而提高了焊接接头抗拉强度,细化焊缝晶粒组织,断口韧窝趋于均匀且密度增加,提高了铝合金焊缝质量.

     

    Abstract: A variable polarity plasma arc (VPPA) welding system that has single power supply and double pulse hybrid modulation is developed. High-low frequency pulse is modulated on the basis of typical VPPA welding power, in which high frequency is from 1 kHz to 5 kHz, low frequency is from 1 Hz to 2 Hz and double pulse consisting of both high and low frequency can be generated. With the utilization of tensile test, SEM observation, the welding quality and mechanical properties of the welded 3003 aluminum joints are analyzed. The test results show that because of the effect of stirring and impacting on molten pool exerted by the periodicity variation of pulse current, the tensile strength of the weld joint is improved, the weld grains are refined and the fracture dimples are uniform and dense. Thus, the quality of the aluminum alloy welds is improved.

     

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