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光斑直徑對純鈦薄片激光封孔的影響
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南昌航空大學(xué) 輕合金加工科學(xué)與技術(shù)國防重點(diǎn)學(xué)科實(shí)驗(yàn)室,南昌航空大學(xué) 輕合金加工科學(xué)與技術(shù)國防重點(diǎn)學(xué)科實(shí)驗(yàn)室,南昌航空大學(xué) 輕合金加工科學(xué)與技術(shù)國防重點(diǎn)學(xué)科實(shí)驗(yàn)室,南昌航空大學(xué) 輕合金加工科學(xué)與技術(shù)國防重點(diǎn)學(xué)科實(shí)驗(yàn)室,哈爾濱工業(yè)大學(xué) 先進(jìn)焊接與連接國家重點(diǎn)實(shí)驗(yàn)室

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TG456.7

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國家自然科學(xué)基金資助(51365044)；南昌航空大學(xué)研究生創(chuàng)新基金(YC2015025).


Effect of Spot Size on Joint Formation of Laser Hole Sealing of CP-Ti Sheet
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National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology,Nanchang Hangkong University,National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology,Nanchang Hangkong University,National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology,Nanchang Hangkong University,National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology,Nanchang Hangkong University,State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology

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    摘要:

    采用Nd：YAG低功率脈沖激光對0.4mm純鈦薄片的微孔進(jìn)行封焊，研究光斑直徑對焊縫成形的影響規(guī)律，并分析作用于封接區(qū)的激光能量變化。研究表明，當(dāng)光斑直徑不大于0.4mm時(shí)小孔能夠完全封接，封接區(qū)有效厚度隨著光斑直徑的增大呈先增大后減小的趨勢，其最大有效封接厚度約為352μm，封接接頭主要由不同形態(tài)的α晶粒組成，在封接區(qū)邊緣存在較大的熱影響區(qū)。另外，隨著光斑直徑的增大，封接區(qū)上表面熔化面積基本不變，但封接模式由匙孔型向熱導(dǎo)型轉(zhuǎn)變，其中熱導(dǎo)型模式更適合小孔封接。對作用于封接區(qū)的激光能量計(jì)算發(fā)現(xiàn)，理論能量值與光斑直徑成正相關(guān)，而實(shí)際金屬熔化量與光斑直徑成反相關(guān)，造成此現(xiàn)象的原因是小孔邊緣熔化的金屬在重力等力的作用下向小孔內(nèi)流動(dòng)，從而可以吸收更多的激光能量。

    Abstract:

    Laser seal welding of 0.4mm thickness pure titanium with holes was achieved by N d: YAG pulse laser. The effect of laser spot size on the weld geometry of the sealed joint was studied. The results show that full seal welded joint can be achieved when the spot diameter is no more than 0.4mm. The effective thickness of sealing area increases at first then decreases with the increasing of spot diameter. The maximum effective sealing thickness is about 352μm.The sealing joint was consisted of alpha grains with different shapes, and there was a large HAZ in the joint. Besides, with the increase of the spot diameter, the surface melting area of the sealed joint is basically unchanged, but the sealing mode is changed from the keyhole to the heat-conduction type, and the heat-conduction model is more suitable for the hole sealing. Further, calculated laser energy of sealing area shown that there was a positive proportion between the theoretical energy value and laser spot size, but the theoretical analysis does not match with the actual situation. The reason may be that the molten metal beside the hole flow into the hole under the effect of gravity and other forces, which cause the increasing of actual absorption of laser energy.

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黃永德,毛錦榮,周興汶,陳玉華,何鵬.光斑直徑對純鈦薄片激光封孔的影響[J].稀有金屬材料與工程,2018,47(8):2429~2424.[Huang Yongde, Mao Jinrong, Zhou Xinwen, Chen Yuhua, He Peng. Effect of Spot Size on Joint Formation of Laser Hole Sealing of CP-Ti Sheet[J]. Rare Metal Materials and Engineering,2018,47(8):2429~2424.]
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歷史
  • 收稿日期:2016-08-03
  • 最后修改日期:2016-09-28
  • 錄用日期:2016-11-10
  • 在線發(fā)布日期: 2018-10-17
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