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Al-Mg合金超高頻脈沖VP-GTAW電流參數(shù)優(yōu)化
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北京航空航天大學(xué)機械工程及自動化學(xué)院

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中圖分類號:

TG457.14

基金項目:

國家自然科學(xué)基金資助（項目號51675031），北京市自然科學(xué)基金資助（項目號3182020）


Optimization of Ultrahigh-Frequency Pulsed VP-GTAW Welding Parameters for Aluminum-Magnisium Alloy
Author:
Affiliation:

School of Mechanical Engineering and Automation of Beijing University of Aeronautics and Astronautics

Fund Project:

the National Natural Science Foundation of China (51675031)，Beijing Natural Science Foundation (3182020)

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    摘要:

    以鋁鎂系5A06鋁合金為對象，開展了復(fù)合超高頻脈沖變極性鎢極氣體保護電弧焊（Hybrid Ultrahigh Frequency Pulsed Variable Polarity Gas Tungsten Arc Wending, HPVP-GTAW）電流參數(shù)優(yōu)化研究。利用正交試驗方法設(shè)計了焊接實驗，以接頭薄弱區(qū)的顯微硬度為評價指標，以HPVP-GTAW電流特征參數(shù)為影響因素，分別采用極差分析法和回歸分析法對實驗結(jié)果進行分析與討論。結(jié)果表明，變極性電流頻率fL、高頻脈沖頻率fH和脈沖電流比例系數(shù)ψ（定義為高頻脈沖基值電流Ib、高頻脈沖峰值電流Ip和脈沖占空比δ的綜合作用）的最優(yōu)參數(shù)匹配依次為1kHz、20kHz和0.6（Ib為75A，Ip為180A，δ為0.2）。fL對顯微硬度影響最為顯著，fH影響作用次之，ψ對顯微硬度影響最弱。最優(yōu)參數(shù)匹配的條件下，接頭的顯微硬度、抗拉強度、延伸率和斷面延伸率分別達到母材性能的84.7%、94.3%、80%和93.4%。

    Abstract:

    Optimization of ultrahigh frequency pulsed VP-GTAW (HPVP-GTAW) welding parameters on microhardness for 5A06 aluminum alloy was carried out. Taguchi method was employed to design the experiment. The microhardness of the fusion zone and heat affected zone (HAZ) was taken as indicator, and the characteristic welding current parameters of HPVP-GTAW were taken as factors. The experimental results were analyzed by both the range analysis method and regression analysis method. Results show that the optimal parameters of variable polarity current frequency fL, pulse frequency fH and pulsed current proportional coefficient ψ are 1kHz, 20kHz and 0.6 (high-frequency background current 75A, high-frequency peak current 180A, duty cycle of high-frequency pulse 0.2), respectively. Meanwhile, fL influences on microhardness the most significantly, followed by fH, and the impact extent of ψ on microhardness is the least. The confirmatory experiment shows that the microhardness, tensile strength, percent elongation and ratio of reduction with the obtained optimal parameters are 84.7%、94.3%、80% and 93.4% of those of the base matel, respectively.

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王義朋,齊鉑金,從保強,王 強,周 陽. Al-Mg合金超高頻脈沖VP-GTAW電流參數(shù)優(yōu)化[J].稀有金屬材料與工程,2018,47(11):3522~3527.[Wang Yipeng, Qi Bojin, Cong Baoqiang, Wang Qiang, Zhou Yang. Optimization of Ultrahigh-Frequency Pulsed VP-GTAW Welding Parameters for Aluminum-Magnisium Alloy[J]. Rare Metal Materials and Engineering,2018,47(11):3522~3527.]
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  • 收稿日期:2017-02-27
  • 最后修改日期:2018-10-25
  • 錄用日期:2017-09-11
  • 在線發(fā)布日期: 2018-12-19
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