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首页> 外文期刊>Materials Science and Engineering >Microstructure reaction control of dissimilar automotive aluminium to galvanized steel sheets ultrasonic spot welding
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Microstructure reaction control of dissimilar automotive aluminium to galvanized steel sheets ultrasonic spot welding

机译：异种汽车铝与镀锌钢板超声点焊的组织反应控制

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Ultrasonic spot welding (USW) is an energy efficient thermomechanical technology causing effective bond in less than a second for difficult dissimilar materials combination such as aluminium to steel sheet welding. The interfacial reaction between aluminium 6111-T4 and two different zinc coated steels of hot dipped DX56-Z and galvannealed DX53-ZF has been investigated under controlled process parameters of clamping forces and welding times. Formation of melt at the weld interface was seen to be accelerated and the cause for this discrepancy will be discussed. In aluminium to both coated steel joints, formation of a eutectic structure occurred between aluminium and the zinc coats in short period of time, which changed to a dendritic structure due to an increase in aluminium concentration with longer welding times. In aluminium to DX56-Z steel joints, the failure mainly occurred through the Fe_2Al_((5-x))Zn_x (0 < x < 1) which thickened close to the steel substrate. However, in the aluminium to DX53-ZF steel welds fracture took place mainly due to the brittleness of the Fe_3Zn_10 and Fe_5Zn_21 (Γ and Γ_1) phases and grain boundary embrittlement of the steel. The behaviour of these two zinc coatings during ultrasonic spot welding will be discussed further in detail.
机译：超声波点焊（USW）是一种节能的热机械技术，可在不到一秒钟的时间内实现有效的粘结，从而适用于难于不同的材料组合，例如铝与钢板的焊接。在夹紧力和焊接时间受控的工艺参数下，研究了铝6111-T4与两种不同的热浸DX56-Z和镀锌的DX53-ZF镀锌钢之间的界面反应。可以看到在焊接界面处的熔体形成加速了，并将讨论造成这种差异的原因。在铝与两个涂层钢接头之间，在短时间内在铝和锌涂层之间形成了共晶结构，由于铝浓度的增加和焊接时间的延长，共晶结构变成了树枝状结构。在铝到DX56-Z钢制接头中，失效主要发生在Fe_2Al _（（5-x））Zn_x（0

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