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基于SORPAS软件,对1.8 mm的DP590双相钢板和1.2 mm的6061-T6铝合金板材点焊过程进行了模拟,并将模拟熔核形貌与试验结果进行对比。结果表明,随着焊接过程的进行,工件与电极接触界面处温度迅速升高,而上下电极附近温度并没有迅速升高,接头在铝合金侧和双相钢侧形成双熔核;在整个焊接过程中,铝合金侧的应变明显比双相钢侧大,变形主要集中在熔核附近,熔核边缘应变大于心部;模拟的熔核直径为4.3 mm,实测值为4.6 mm,模拟结果与实测结果较为吻合,所建立的模型可以用于DP590钢及6061-T6铝合金板异种材料电阻点焊过程模拟。
Based on SORPAS software, the spot welding process of 1.8 mm DP590 dual-phase steel plate and 1.2 mm 6061-T6 aluminum alloy plate was simulated, and the simulated nugget morphology was compared with the test results. The results show that with the welding process, the temperature at the contact interface between the workpiece and the electrode increases rapidly while the temperature near the upper and lower electrodes does not increase rapidly. The joint forms a double nugget on both the aluminum alloy and the dual steel. In the process, the strain on the aluminum alloy side is obviously larger than that on the two-phase steel side, and the deformation mainly concentrates near the nugget. The strain at the edge of the nugget is larger than that at the core. The simulated nugget diameter is 4.3 mm and the measured value is 4.6 mm. The measured results are in good agreement. The established model can be used to simulate the resistance spot welding process of dissimilar materials of DP590 steel and 6061-T6 aluminum alloy plate.