论文部分内容阅读
本文详细分析了粗丝CO_2气体保护潜弧焊熔滴过渡的特点和潜弧机理。潜弧状态可以分为三种类型:半潜弧(熔滴主要以较大的颗粒形式过渡)、临界潜弧(熔滴主要以较小颗粒的射滴形式过渡)和深潜弧(熔滴以细小射滴与射流混和形式过渡)。大电流、低电压、粗焊丝、反极性和氧化性气氛是形成潜弧过程的必要条件,其中电流是最重要的条件。潜弧后弧柱气氛改变,焊丝端部的弧根由集中形态扩展为覆盖整个端部形态,使得熔滴尺寸变得细小,熔滴过渡形式发生变化。采用临界潜弧区域的焊接规范参数施焊,飞溅小,工艺过程稳定,焊缝成形优良。
In this paper, the characteristics of the droplet transfer and the submerged arc mechanism of the carbon dioxide gas shielded arc welding are analyzed in detail. Submerged arc states can be divided into three types: semi-submerged arc (droplet mainly in the form of larger particles transition), critical submerged arc (droplets mainly in the form of small droplets) and deep submerged arc In the form of a mixture of small droplets and jets). High current, low voltage, thick wire, reverse polarity and oxidizing atmosphere are the necessary conditions for the formation of a submerged arc, of which the current is the most important condition. After the submerged arc column atmosphere changes, the arc root end of the wire extended from the concentrated form to cover the entire end shape, making the droplet size becomes small, droplet transitional changes. Adopting the welding standard parameters of critical submerged arc area for welding, small spatter, stable technological process and excellent weld seam forming.