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In The Spring Festival people still hang Chinese knot in Tianjin, Tianjin people have the custom that go to Tianjin Ancient Culture Street Qiaoxiang palace to take Chinese knot before the eve of the Spring Festival, take good luck in eth meaning.

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To validate the FE model, first, the nugget shapes in the FEM model are compared to those obtained from the previous experimental test (Ref 17). Figure 3 shows the temperature distribution for sample 1 at the end of the welding cycle (0.08 s). The contour of nugget is defined by considering 655 C as the melting point of the material. As the Fig. 3 presents, the nugget diameter and height for sample 1 are in a good agreement with data obtained from experimental test. The difference between modeling and experimental results may be due to the shrinkage of the nugget as it cools down to room temperature after welding process.
In the next step, in order to measure the residual stresses in aluminum spot welds, two samples of aluminum 6061-T6 sheet with a thickness of 2 mm, and the dimensions (illustrated by Fig. 4) were prepared based on welding parameters described in the Table 1. Before spot welding, each sheet was cleaned mechanically with sandpaper and spot-welding process was performed using an AC power machine with nominal welding power of 200 kVA.
翻译
为了验证有限元模型，首先，在有限元模型的熔核的形状进行比较的那些从以前的实验测试得到的（参考文献17）。图3显示了在焊接周期结束样品1的温度分布（0.08秒）。熔核的轮廓是通过考虑655 C作为材料的熔点的定义。如图3介绍，样品1熔核直径和高度均与实验测试得到的数据吻合良好。建模和实验结果之间的差异可能是由于的熔核收缩，冷却至室温后的焊接工艺。
在接下来的步骤中，为了测量铝合金点焊焊缝残余应力，两个厚度为2毫米的铝6061-T6板样品，和尺寸（图4所示）基于焊接在表1中描述的参数，制备了。点焊前，每片机械清洗用砂纸和点焊过程采用200 kVA额定焊接电源的交流电源机。

为了验证有限元模型，首先，在有限元模型的熔核的形状进行比较的那些从以前的实验测试得到的（参考文献17）。图3显示了在焊接周期结束样品1的温度分布（0.08秒）。熔核的轮廓是通过考虑655 C作为材料的熔点的定义。如图3介绍，样品1熔核直径和高度均与实验测试得到的数据吻合良好。建模和实验结果之间的差异可能是由于的熔核收缩，冷却至室温后的焊接工艺。
在接下来的步骤中，为了测量铝合金点焊焊缝残余应力，两个厚度为2毫米的铝6061-T6板样品，和尺寸（图4所示）基于焊接在表1中描述的参数，制备了。点焊前，每片机械清洗用砂纸和点焊过程采用200 kVA额定焊接电源的交流电源机。