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脈沖激光-電弧復(fù)合焊接鎂合金過程中熔池行為與氣孔產(chǎn)生的關(guān)系研究
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1.遼寧工業(yè)大學(xué)材料科學(xué)與工程學(xué)院;2.哈爾濱工業(yè)大學(xué)先進(jìn)焊接與連接國家重點實驗室;3.中國石油天然氣股份有限公司錦州石化分公司

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the National Natural Science Foundation of China (Grant Nos 51571006 and 51805236), the Natural Science Foundations of Liaoning Province (Nos. JQL201715402 and 20180510.40) and the Program for Liaoning Distinguished Professor.；哈爾濱工業(yè)大學(xué)先進(jìn)焊接與連接國家重點實驗室開放項目


Relationship between molten pool behavior and keyhole-induced porosity in pulsed laser-arc hybrid welding of magnesium alloy
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    摘要:

    激光-電弧復(fù)合焊接鎂合金過程中氣孔是一種重要缺陷。本文針對復(fù)合熱源焊接過程中熔池行為和激光匙孔引起的氣孔之間的關(guān)系進(jìn)行了實驗研究。研究中重點考查了激光脈沖對熔池的沖擊作用，匙孔的動態(tài)行為以及氣孔的形成規(guī)律。研究結(jié)果表明激光脈沖的參數(shù)決定其對液態(tài)熔池的沖擊作用，較強(qiáng)的激光脈沖作用可以有效抑制氣孔的形成；液態(tài)金屬的行為主要有匙孔行為主導(dǎo)；匙孔的尺寸和開-閉狀態(tài)直接影響焊后氣孔的形成；過高的激光脈沖功率會導(dǎo)致焊后氣孔的形成；匙孔開口維持時間越長，焊后氣孔數(shù)量越少。

    Abstract:

    The porosity is an important kind of weld defects in deep-penetration laser-arc welds. This paper gives an Experimental study on relationship between molten pool behavior and keyhole-induced porosity in pulsed laser-arc hybrid welding. In this research, the impact effect of laser pulse on the weld pool, and live behavior of the laser keyhole and the porosities in the weld were investigated in detail. Results show that the impact effects from the laser pulse depend on the laser pulse parameters and stronger impact effect helps restrain the porosity formation. The laser keyhole state dominants the welding pool behavior. The keyhole dimension and open-close state directly influences the porosity formation. Extremely high laser pulse power always brings about porosities after welding. Lengthening the laser keyhole opening time and giving the gas enough time to escape will be an effectively way to restrain the porosity.

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辛立軍,林三寶,劉旭平,陳明華,伍復(fù)發(fā).脈沖激光-電弧復(fù)合焊接鎂合金過程中熔池行為與氣孔產(chǎn)生的關(guān)系研究[J].稀有金屬材料與工程,2020,49(6):1894~1900.[辛立軍,Lin Sanbao, Liu Xuping, Chen Minghua, Wu Fufa. Relationship between molten pool behavior and keyhole-induced porosity in pulsed laser-arc hybrid welding of magnesium alloy[J]. Rare Metal Materials and Engineering,2020,49(6):1894~1900.]
DOI：10.12442/j. issn.1002-185X.20190152

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  • 收稿日期:2019-02-25
  • 最后修改日期:2019-04-03
  • 錄用日期:2019-04-10
  • 在線發(fā)布日期: 2020-07-09
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