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采用椭圆管板封头的新型结构的锅炉(图1),由于锅筒结构的限制,封头中心没有人孔,最后一道内环缝很难实现自动焊(图2)。
Due to the structure of the drum, there is no manhole in the center of the head, and the last inner ring seam is difficult to realize automatic welding (Figure 2).