The paper introduces welding technology of type ZY6400/12.5/28 hydraulic support, from several respects of selecting materials preheat before welding, welding process and so on.
从焊接材料的选用，焊前预热、焊接过程和焊后热处理的控制几个方面，着重介绍了ZY6400/12.5/28型液压支架的焊接工艺。
This Paper mainly introduced hoe to satisfy forestry economical duration by reasonably selecting logging ways and technology type.
阐述了森林采伐中如何通过采伐方式和工艺类型的合理选择、采伐量的合理确定，来满足林业经济的持续性。
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