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向下焊是焊条自上而下的移动完成焊接的方法,是采用特殊的焊条(纤维素焊条)、特殊的焊接设备和特殊的焊接工艺相配合的在输油输气管道等焊接工程中最新的施工方法。其特点是电弧密度大、焊缝有足够的熔深、焊接速度快、线能量小、焊缝结晶组织细小、力学性能好、热影响区小、焊
Downward welding is the top-down welding electrode to complete the welding method is to use a special electrode (cellulose electrode), special welding equipment and special welding process in the oil and gas transmission pipeline and other welding projects in the latest The construction method. It is characterized by a large arc density, weld penetration enough, fast welding speed, small wire energy, small weld crystal structure, good mechanical properties, small heat-affected zone, welding