アーク溶接時の溶滴生成過程における合金元素の挙動

概要

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Generally, chemical reaction in metal arc welding will take place in each stage of the following process; stage of droplet at electrode tip, stage of droplet transfer through arc space and stage of molten pool. In this work, it is aimed to analyze the chemical reactions in the stage of droplet at electrode tip. Using iron-carbon, iron-silicon and iron-manganese electrode wires, loss of carbon, silicon and manganese in the droplet are determined under two metal transfer modes in CO_2 arc welding. The results obtained are summarized as follows; 1) In arc welding under both short-circuiting and globular transfer conditions, C, Si and Mn contents of droplet decrease with increasing the growth time until 0.2∿0.3 second. Over that time, appearent loss of alloying elements are a little. 2) Oxygen content of droplet increases with increasing the growth time of droplet until 0.2∿0.3 second. The oxygen contents of droplets are mutually related to the loss of the alloying elements of droplets at individual growth time of droplet. 3) Loss of alloying elements in droplet just before the detachment in short-circuiting transfer condition are less than that in globular transfer condition. 4) The consumption rate of C seems to be greater than Mn, Si, in the stage of droplet growth.
社団法人溶接学会の論文
1980-09-05