一、焊接特点低合金钢属于“焊工考试规则”钢材分类和分组的A类Ⅱ组,如16MnR(16Mn)、16Mng、20Mn、09Mn2VR等。这些钢种可焊性较好,但要求采用碱性焊条焊接,工艺严格,与低碳钢试件焊接相比,难度较大。现以焊接16MnR(16Mn)试件为例,分别介绍板状和管状试件的焊接方法。焊接低合金钢时,焊接电源应选择AX—系列的直流手弧电焊机,并采 First, the welding characteristics of low alloy steel are “welder examination rules” steel classification and group A group Ⅱ group, such as 16MnR (16Mn), 16Mng, 20Mn, 09Mn2VR and so on. These steels are more solderable, but require the use of alkaline welding electrodes, the process is strict, compared with low-carbon steel welding specimens, more difficult. Is to welding 16MnR (16Mn) specimen, for example, were introduced plate and tube specimen welding method. Low-alloy steel welding, the welding power should choose AX-series DC arc welding machine, and mining