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前言采用自保护焊丝的无气体保护电弧焊,由于具有不受风力影响的特点,已广泛应用于造船、大厦建筑等现场焊接。近年来,随着焊丝质量稳定性的提高、送丝装置的改进,并且也由于自动化和机械化的迫切需要,无气体保护电弧焊方法的应用范围愈来愈广。尽管无气体保护电弧焊方法有上述许多优点,但它仅适用于平焊和横焊位置,难以用于立焊和仰焊位置。为了使焊丝能用于全位置焊接,对减小
Preface The gas-shielded arc welding with self-shielded welding wire has been widely used in on-site welding such as shipbuilding and building construction due to its unaffected by the wind. In recent years, with the improvement of the quality of welding wire, the improvement of the wire feeding device, and also due to the urgent need of automation and mechanization, the application range of gas-free shielded arc welding method is getting wider and wider. Although gas-shielded arc welding has many of the advantages described above, it is only suitable for flat and horizontal welding locations and is difficult to use for vertical and overhead welding locations. In order to make the welding wire can be used for all-position welding, to reduce