本文選題：激光焊接 + 焊接位置��； 參考：《應(yīng)用激光》2017年01期

【摘要】：激光熔池流動模式和熔池流動特征決定了焊縫成形和焊接缺陷的分布,因此研究不同焊接位置對激光焊接流動行為的影響對優(yōu)化焊接位置和焊接參數(shù)具有重要意義。采用1.5kW板條型CO_2氣體激光進行了平焊和立焊向上、立焊向下等不同焊接位置下的焊接試驗,并采用高速攝像對其熔池小孔特征進行了監(jiān)測,再采用粒子圖像測速(PIV)方法對熔池流動特征進行了定量表征和分析。明確了激光焊接時的熔池流動模式,在熔池區(qū)域存在著兩個大的渦流區(qū)域,分別在熔池周圍和在熔池的尾部。與立向上焊相比,激光立向下焊的熔池形狀呈扁圓形,寬度增加而長度減少,小孔的面積增加,其熔池流動的脈沖特征減弱,熔池流動的穩(wěn)定性增加。這與立向下焊時熔池上方液態(tài)金屬受重力影響向下流動,與下方液態(tài)金屬受蒸汽反沖壓等驅(qū)動向上流動,兩者相遇產(chǎn)生的強烈攪拌作用有關(guān)。這為理解不同焊接位置不同的焊縫成形和氣孔率差異提供了依據(jù)。
[Abstract]:The distribution of weld forming and welding defects is determined by laser pool flow mode and weld pool flow characteristics. Therefore, it is important to study the influence of different welding positions on laser welding flow behavior for optimizing welding position and welding parameters. The welding experiments were carried out in different welding positions, such as horizontal welding, vertical welding, vertical welding and vertical welding with 1.5kW slab CO_2 gas laser, and the characteristics of weld pool holes were monitored by high speed video. The particle image velocimetry (PIV) method was used to quantitatively characterize and analyze the flow characteristics of the molten pool. The flow mode of the molten pool during laser welding is clarified. There are two large eddy current regions in the weld pool region, one around the pool and the other at the end of the pool. Compared with vertical upward welding, the weld pool of laser vertical downward welding is oblate, the width increases, the length decreases, the area of the holes increases, the pulse characteristic of the molten pool flow weakens, and the stability of the molten pool flow increases. This is related to the downward flow of the liquid metal above the molten pool under the influence of gravity and the upward flow of the liquid metal under the driving force of steam back stamping during vertical downward welding. This provides a basis for understanding the difference of weld formation and porosity in different welding positions.
【作者單位】： 中國工程物理研究院機械制造工藝研究所;
【基金】：國家自然科學(xué)基金資助項目(項目編號:51005219) 中國工程物理研究院科學(xué)技術(shù)發(fā)展基金重點資助項目(項目編號:2013A0203008)
【分類號】：TG456.7

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本文編號：1780657