Material flow and mixing patterns during dissimilar FSW
Material flow and mixing patterns during dissimilar FSW
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DOI：
10.1179/136217110x12785889549543
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发表时间：
2010-11-01
影响因子：
3.3
通讯作者：
Echeverria, A.
中科院分区：
文献类型：
--
作者：
Alvarez, P.;Janeiro, G.;Echeverria, A.
本研究的主要目的是研究异种材料搅拌摩擦焊（FSW）过程中发生的流动模式和混合。洋葱圈的起源和焊接缺陷的发展等方面被认为是。对焊接参数（转速）对AA 7075-T6和AA 2024-T3（3 mm厚度）异种对接焊缝的材料混合的影响进行了评估。采用“停止动作”技术，以获得其中一个样品中的流动和混合的近距离快照，该样品显示出有限的混合，但具有最佳的机械性能和表面状况。在该样品中，由于销后部形成空腔，因此在螺纹内发现了不稳定的旋转流。这一事实在纵截面上产生了特征带，但还不足以形成洋葱环状的混合模式。
The main goal of this investigation is to study the flow pattern and mixing which take place during dissimilar friction stir welding (FSW). Aspects such as the origin of onion rings and development of welding defects are considered. An evaluation of the impact of welding parameters (rotational speed) on material mixing of AA 7075-T6 and AA 2024-T3 (3 mm thickness) dissimilar butt welds was performed. The 'stop action' technique has been employed in order to acquire a close snap shot of the flow and mixing in one of the samples which showed limited mixing but optimal mechanical performance and surface condition. A non-stable rotational flow inside the threads has been identified in this sample due to the formation of a cavity on the rear of the pin. This fact gave rise to characteristic bands in the longitudinal section but it was not enough for developing an onion ring-like mixing pattern.