本文選題：熔池振蕩 + 熔透狀態(tài)　； 參考：《機(jī)械工程學(xué)報》2016年20期

【摘要】：熔池振蕩頻率與熔池尺寸具有直接物理對應(yīng)關(guān)系,但常規(guī)弧壓、弧光方法很難實現(xiàn)連續(xù)焊接振蕩頻率提取。提出一種激光視覺測量方法用于連續(xù)焊接振蕩頻率檢測。對連續(xù)焊接條件下部分、臨界及全熔透狀態(tài)下的熔池振蕩激光條紋進(jìn)行采集,通過圖像處理算法提取不同熔透狀態(tài)下的頻率特征,并從激光條紋變化形態(tài)、熔池表面振蕩和液態(tài)金屬內(nèi)部流動對不同頻率特征進(jìn)行分析。結(jié)果表明,激光視覺法能夠精確檢測熔池表面金屬軸向及橫向的流動;在部分和全熔透狀態(tài)下熔池表面及內(nèi)部金屬以單一模式進(jìn)行振蕩,存在單一特征頻率;在臨界熔透狀態(tài)下由于熔池約束條件的變化,使其表面振蕩及內(nèi)部金屬振蕩具有部分和全熔透的振蕩特征,表現(xiàn)出兩種特征頻率;不同熔透狀態(tài)的振蕩頻率特征可為精確檢測不同熔透狀態(tài)提供依據(jù)。
[Abstract]:There is a direct physical correspondence between the oscillation frequency of molten pool and the size of weld pool, but it is difficult to extract the frequency of continuous welding oscillation by conventional arc voltage and arc light method. A laser vision measurement method for continuous welding oscillation frequency detection is proposed. The oscillatory laser fringes of molten pool under continuous welding condition, critical and fully permeable state were collected, and the frequency characteristics of different penetration states were extracted by image processing algorithm, and the pattern of laser stripes was changed from the laser stripes. The characteristics of different frequencies were analyzed by oscillating on the surface of molten pool and internal flow of liquid metal. The results show that the laser vision method can accurately detect the axial and lateral flow of metal on the molten pool surface and oscillate in a single mode with a single characteristic frequency on the surface and inside of the molten pool in partial and fully permeable state. Under the critical penetration condition, the surface oscillation and the internal metal oscillation have partial and full penetration oscillation characteristics due to the variation of the confinement conditions of the molten pool, showing two characteristic frequencies. The oscillatory frequency characteristics of different penetration states can provide basis for accurate detection of different penetration states.
【作者單位】： 蘭州理工大學(xué)省部共建有色金屬先進(jìn)材料加工與再利用國家重點實驗室;
【基金】：973計劃前期研究專項(2014CB660810) 國家自然科學(xué)基金(51305189) 甘肅省自然科學(xué)基金(145RJZA119) 蘭州理工大學(xué)紅柳杰出人才培養(yǎng)計劃(J201201) 省部共建有色金屬先進(jìn)加工與再利用國家重點實驗室開放基金(SKLAB02015008)資助項目
【分類號】：TG444.74
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本文編號：2076686