Automatic control has been used in the ignition of electric arc, welding wire-feed, movement of arc along welding direction, receiving arc of welding, etc.
埋弧自动焊时，引燃电弧、焊接送丝、电弧沿焊接方向移动及焊接收尾等过程均可实现自动化控制。
Meantime it finds out property change reason of coarse crystal area from welding coarse crystal area structure change and puts forward the direction of toughness.
同时，还从焊接粗晶区组织变化中找出了粗晶区性能变化的原因，并提出了韧化方向。
But in the backing welding, columnar grain-growth will be appeared in the direction of crystal direction, it effects the welding quality seriously.
但是单面焊打底层焊缝中出现的沿焊缝柱状晶结晶方向的柱状气孔，严重地影响着船舶焊接质量。
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