手工电弧焊的焊接规范有焊条直径、电源种类与极性、焊接电流、电弧电压、焊接速度和焊接层数等,主要规范参数是焊条直径和焊接电流。焊接规范对于焊接质量和生产率影响很大,必须正确选择。 1、焊条直径的选择 (1)焊件的厚度较厚的焊件应选用直径较大的焊条,反之,亦然。 (2)焊接位置平焊焊缝选用的焊条直径应比其它位置大,d_(max)=6mm。立焊的d_(max)=5mm,仰焊、横焊的d_(max)=4mm。 (3)焊接层数在多层焊时,为防止产生未焊透缺陷,在焊底层焊缝时,应采用直径 Manual arc welding welding rod diameter, power supply type and polarity, welding current, arc voltage, welding speed and the number of layers of welding, the main parameters are the standard welding rod diameter and welding current. Welding specifications for welding quality and productivity have a great influence, we must correct choice. 1, the choice of electrode diameter (1) weldment thicker weldments should use larger diameter electrode, and vice versa. (2) welding position welding seam welding rod diameter selection should be larger than other locations, d_ (max) = 6mm. Vertical welding d_ (max) = 5mm, Yang welding, horizontal welding d_ (max) = 4mm. (3) the number of layers of welding in the multi-layer welding, in order to prevent the occurrence of impermeable defects in the bottom weld, the diameter should be used