溶接現象に関する界面張力理論(第 3 章) : つぼ中の母滴の挙動とアークの相互作用

概要

論文の詳細を見る
Assuming that the contact angle of mother drop upon the surface of penetration is a constant value θ_0,the pulling force acting on the contact line of the mother drop was calculated, by which the oscillation of the mother drop was caused. It was concluded as follows. (1) Defining the X- and Y-component of pulling force due to the interfacial tension acting upon ds part along the depressed contact line of the mother drop within the surface of penetration as dF_X and dF_Y [numerical formula] where θ_g; angle of inclination of the surface of penetration at point P α; angle between the contact line and equi-depth contour line at point P (2) Using the above equation, there is found a strong pulling force acting upon the contact line near the point where it starts to deviate from the melting line of the surface of penetration, which tends to pull back the drop to the melting line. (3) If the depressed contact line of mother drop starts to displace itself, the movement is accelerated by the digging action of arc upon the bare surface of mother plate. (4) The interaction between these forces and the digging action of arc brings about an oscillation of the mother drop and a displacement of exposed surface of mother plate, which results in uniform penetration. The shape of penetration depends on the strength of arc force or size of depressed part of mother drop.
社団法人溶接学会の論文
1963-01-25