This paper introduces the rehabilitation procedure of PE lined pipeline and stresses on quality control requirement of PE pipe heat melting welding.
文章介绍了内衬PE管修复技术的施工程序，强调了PE管道热熔焊接质量控制要求。
From quality of melting metal, casting condition and casting equipment, the influence factors of crack in aluminium and its alloy slab ingot were analyzed, some suggestion have been drawn out.
从铝及铝合金的熔体质量、铸造条件和铸造设备三个方面，分析了对铝及铝合金扁锭裂纹影响的诸要素，并提出避免裂纹的措施。
Relation between melting rate and solidification quality and how to obtained the reasonable melting rate is discussed.
讨论了电极熔化速度与凝固质量之间的关系，及如何计算合理的熔化速度。
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