在一切比较重要的焊接结构中都采用碱性低氢型焊条来焊接。低氢型焊条与其它类型的酸性焊条相比具有很多优点;如有良好的机械性能(特别是焊缝金属的塑性、韧性及抗时效性能)和抗裂性能,但如果使用不当时,很容易出现各种缺陷。怎样才能合理使用碱性低氢型焊条 In all the more important welding structures are used alkaline low-hydrogen welding electrode. Low-hydrogen electrodes offer many advantages over other types of acidic electrodes; good mechanical properties (especially plasticity, toughness and aging resistance) and cracking resistance of the weld metal are easily met if not used properly A variety of defects appear. How can we reasonably use alkaline low hydrogen type electrode