—42A型焊条是用于手工短弧焊接的較好的一种低碳鋼焊条。它的机械性能很好,特別是延伸率大,最适合于焊接承受动載荷的結構,如鋼柱、吊車梁等。我厂焊条車間于三月间試制成功,經过技术鉴定,質量符合苏联标准。—42A焊条的焊芯是采用大連鋼厂生产的焊条鋼。药皮配方列于表1。用水玻璃作粘合剂,其此重为1.46～1.59。在生产初期,采用手工沾药法;后来采用螺旋 -42A electrode is a better kind of low-carbon steel electrode for short arc welding by hand. Its good mechanical properties, especially the large elongation, the most suitable for welding to withstand dynamic load structure, such as steel columns, crane beams and so on. Our factory welding rod trial in March successfully, after technical appraisal, quality in line with the Soviet Union standards. -42A welding electrode is the use of welding rod produced by Dalian Steel. Tablets formulations are listed in Table 1. Water glass as a binder, the weight of 1.46 ~ 1.59. In the early stages of production, the use of hand-dip method; and later the use of spiral