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Study on laser welding-brazing of zinc coated steel to aluminum alloy with a zinc based filler

机译：用锌基填料对镀锌钢与铝合金进行激光焊接钎焊的研究

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摘要

Laser welding-brazing (LWB) technique with CW Nd:YAG laser was used for lap joining of zinc coated steel (DP600) with aluminum alloy (AA6016) using a filler wire composed of 85% Zn and 15% Al. LWB was performed with varying laser power, brazing speed, and wire feed speed. The microstructure and composition analyses of the brazed joints were examined using SEM and EDS while the mechanical properties were measured in the form of micro-hardness and tensile strength. The thickness of reaction layers formed along the steel-seam interface was in the range of 3-23 μm, and it varied with the brazing speed. The average micro-hardness value of this layer was 348 HV, compared to 150 HV in brazed seam and 230 HV in steel matrix. It has been found that joints produced with heat inputs between 60 and 110J/mm exhibited higher mechanical resistance of about 220 MPa and the failures occurred away from the joints on aluminum side. The corresponding brazing speeds are between 0.5 and 0.8m/min and the thickness of the layer produced ranged between 8 and 12 μm.
机译：使用CW Nd：YAG激光的激光焊接—钎焊（LWB）技术，使用由85％的Zn和15％的Al组成的填充焊丝将镀锌钢（DP600）与铝合金（AA6016）搭接连接在一起。用不同的激光功率，钎焊速度和送丝速度执行LWB。使用SEM和EDS检查了钎焊接头的微观结构和成分分析，同时以显微硬度和拉伸强度的形式测量了机械性能。沿着钢缝界面形成的反应层的厚度在3-23μm的范围内，并且随钎焊速度而变化。该层的平均显微硬度值为348 HV，而在钎焊缝中为150 HV，在钢基质中为230 HV。已经发现，以60至110J / mm的热输入产生的接头表现出更高的约220MPa的机械阻力，并且在铝侧的接头之外发生故障。相应的钎焊速度在0.5至0.8m / min之间，并且产生的层的厚度在8至12μm的范围内。

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