200的管子焊接弯头的保温棉怎么下料？谢谢！ 焊接技术与工程的学科排名
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板金展开图样一般都采用相贯线法放样，没有计算公式。算出大小面，除以节数找到最高最低点，依次类推，放出鱼形样板，虾米腰弯头2个端节等于一个中节，例如下图
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