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立向下焊作为手工电弧焊的一种施焊技术，在我国长输大口径管道上得到普通应用和推广，该技术在国外应用已有十几年历史。其特点是：焊接技术好，速度快，生产效率高，易学习掌握，便于流水作业。 由于下向焊条采用纤维素型和低氢型药皮，施焊规程要求严格，因而在管道焊接过程
Vertical down welding as a kind of manual arc welding welding technology, long-term large-diameter pipe in our country have been the ordinary application and promotion, the technology has been applied abroad for more than 10 years of history. Its characteristics are: welding technology is good, fast, high production efficiency, easy to learn to master, easy assembly line. Due to the lower electrode with a cellulose-based and low-hydrogen-type coating, welding procedures demanding, and therefore in the pipeline welding process