A 部分： 焊接理论基础— 闭卷考试；150 道考题；
这为进一步研究焊接接头的抗断性能分析提供了一定的理论基础。
This provides a certain theory and criterion for us to further research the fracture-resistant capability of welded joint .
在数字信号处理及无损检测的理论基础上，分析了焊接过程对电流信号频谱的影响。
On the basis of digital signal process and nondestructive testing, the effect of welding process on the frequency spectrum of the current signal in AC spot welding is analyzed.
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