ビード波の形成機構

概要

論文の詳細を見る
In the previous report, the author developed a new method to calculate the rippling pattern by means of the 'solidification equation, ' which was postulated to represent the balance of interfacial tensions at the edge of the solid-liquid interface. Furthermore in this report. he showed analytically that the simple harmonic standing wave of a molten pool can be reproduced in the bead ripple pattern in a scale of v/c (v; welding speed, c; velocity of surface wave of the molten pool, v/c<<1), only when the mean liquid phase angle θ is 90 deg., and the liquid phase angle θ is always equal to the solidification angle φ. The bead height tends to decrease after each one cycle duration when the inclination angle of advancing solidliquid interface β is smaller than 90 deg., even if θ^^^-=β and θ=φ. Therefore, in order to obtain the stationary flat bead, it is necessary for the molten pool to be of swollen shape, and mean the liquid inclination angle α^^^- must increase as β becomes smaller and θ_S of a material greater. solidification equation γ_s cosφ=γcosθ+γ_i γ_s=γcosθ_S+γ_i θ_S; characteristic value of θ when φ is zero in solidification equation
社団法人溶接学会の論文
1978-05-05