Blasting type penetrating characteristic in variable polarity plasma arc welding of aluminum alloy of type 5A06
Blasting type penetrating characteristic in variable polarity plasma arc welding of aluminum alloy of type 5A06
复制标题
5A06型铝合金变极性等离子弧焊爆破型熔深特性
DOI：
10.1016/j.ijheatmasstransfer.2017.11.035
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发表时间：
2018-03
影响因子：
5.2
通讯作者：
Jiang Fan
中科院分区：
文献类型：
--
作者：
Chen Shujun;Xu Bin;Jiang Fan
本文首先通过实验阐明了5A06型铝合金变极性等离子弧焊(VPPAW)过程中挖坑过程的特点。通过电信号和光信号测量侵彻时间，观察到一种特殊的“爆破式”侵彻现象。建立了 3D 模型来数值研究挖掘过程中的传热、流体流动和表面形状。采用自适应热源来描述涉及流体体积（VOF）方法跟踪的小孔变形的传热过程。随着匙孔深度的增加，等离子弧压力以抛物线形式衰减。发现金属充分熔化后，熔池表面变得凹陷。匙孔深度呈现响应性变化，与焊接参数的不同阶段相对应。后期深度迅速增加至完全侵彻状态，呈现“爆破式”侵彻过程。通过考虑流体流动的能量积累和质量守恒来解释锁孔的形成。挖孔过程中的最大速度总是出现在匙孔表面，焊池内部出现相反方向的涡流。计算的穿透时间、锁孔尺寸和熔合线与实验结果基本一致。
Experiments were carried out in this paper first to clarify the characteristics of a digging process during aluminum alloy of type 5A06 variable polarity plasma arc welding (VPPAW). A special “Blasting type” penetrating phenomenon was observed through measuring the penetrating time by electrical and optical signals. A 3D model was established to numerically investigate heat transfer, fluid flow and surface shape during the digging process. An adaptive heat source was adopted to describe heat transfer process involving deformation of the keyhole tracked by volume-of-fluid (VOF) method. The plasma arc pressure attenuated in a parabolic form as the depth of the keyhole increases. It is found that the weld pool surface becomes concave after sufficient melting of metal. The keyhole depth exhibits responsive changes, which corresponds with the different stages of welding parameters. In the late stage, the depth increase rapidly to fully penetrating state, which shows a “blasting type” penetrating process. The keyhole formation was interpreted by considering energy accumulation and mass conservation of fluid flow. The maximum velocity during digging process always occurs on the keyhole surface, where a vortex in the opposite direction appears inside the weld pool. The calculated penetrating time, keyhole size and fusion line were basically in agreement with the experimental results.
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