JOURNAL OF THE JAPAN WELDING SOCIETY
Online ISSN : 1883-7204
Print ISSN : 0021-4787
ISSN-L : 0021-4787
Volume 16 , Issue 7
Showing 1-2 articles out of 2 articles from the selected issue
  • [in Japanese]
    1947 Volume 16 Issue 7 Pages 273-281
    Published: 1947
    Released: June 12, 2009
    JOURNALS FREE ACCESS
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  • Takeo Naka, Kouichi Masubuchi
    1947 Volume 16 Issue 7 Pages 281-290
    Published: 1947
    Released: December 10, 2009
    JOURNALS FREE ACCESS
    In this paper the temperature distribution of welded plates under unstationary states is studied.
    When the welding arc, whose voltage is V volt and current intensity I amp., starts from the origin and runs along the x-axis positive-wards which a constant velocity υ cm/sec, temperature rise θ°C of a point (x, y) is expressed by following equations,
    (1) During Welding
    θ=q/4πλe-υ/2x ξ ………(a)
    ξ=x-υt, α=a22/4, γ=α/4K(ξ2+y2)
    (2) After Welding
    θ=q/4πλ e-υ/2Kωα(T+τ)Sxτ(γ) ………(b)
    ω=x-υ(T+τ), α=α22/4k, γ2=α/4K2+y2)
    where
    q: heat quantity given from the arc to the plate per unit time per unit thickness of the plate,
    q=η×024⋅V⋅I⋅1 b
    η=0.6-0.65
    cal/cm/sec
    b : the thickness of the plate, cm
    t : time after the welding is commenced, sec
    T : time interval of welding, sec
    τ : time after the welding is finished, sec
    λ : heat conductivity of the pate, cal/cm/sec/°C
    k : thermal difusivity of the plate, cm2/sec
    a2: coefficient of cooling α2=2E/c∂b 1/sec
    E : heat loss from the surface of the plate per unit time, unit surface area and per unit temperature difference, cal/cm2/sec/°C
    c : specific heat of the plate, cal/g/°C
    ρ : density of the plate, g/cm3
    and
    n2Sn1(y)=∫e/ξ-ξ-γ/ξdξ ………(c)
    The value of nS0(γ)=∫e/ξ-ξ-γ/ξdξ is showed in Table 1. nS0(γ) is already calculaced, when γ≤1. But as in practical problems we often need the value of it, when γ>1 so we added the table of nS0(γ), when γ=1.10-35.0.
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