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  1. Russ0448

    Effective Sky Temperature

    The radiation of the surface that I'm looking at (from my understanding) is a by product of the surface temperature and the effective sky temperature and not the directly surrounding ambient, My assumption for this problem is that the emissivity and the absorptivity of the atmosphere are equal...
  2. Russ0448

    Effective Sky Temperature

    I'm trying to calculate the effective Sky Temperature at a given point on the earth. All that I have been given so far is a rule of thumb for locations around the 30 to 45 deg N Latitude to be 10 to 20 deg C below that of ambient for a clear sky day. For a cloudy day, the effective sky...
  3. Russ0448

    solar Radiation on an object

    Thanks for the help, One other thing I should add is that the structure under investigation is in Spain at an altitude of around 5000 to 6000 Feet above sea level. This may limit the amount of Rayleigh scattering, aerosol extinction, ozone absorption, water vapor absorption, and permanent gas...
  4. Russ0448

    solar Radiation on an object

    I'm at a loss. I have an object that is subject to solar radiation. I'm trying to understand what a good assumption for the heat flux would be. I have been told that a reasonable assumption would be 1000W/m^2. The surface of the object is painted white with (e=. 96 and Alpha=. 21). The surface...
  5. Russ0448

    Welding Heat treated 4130

    Unfortunately the 4130 has already been ordered and at the machine shop. I'm going to let them machine the component, and heat-treat the component to the 100 Ksi. I'll plan on asking for a preheat of 300 F and a 450 F interpass temperature. (Per GRoberts) I'll plan to match the filler to the...
  6. Russ0448

    Welding Heat treated 4130

    Let me clarify, the 4" Dia. round bar will be milled to a 2.36 dia. for 4" of it total length of 4 9/16" the 9/16" will be 4" dia. The weld will be located at the 4" section, with the high stress seen just pass the 4" to 2.36" step on the 2.36” dia side...
  7. Russ0448

    Welding Heat treated 4130

    Russ0448 (Mechanical) May 9, 2003 I'm looking to weld 4130 (4" round bar) to a lower carbon steel (pipe) that is unknown. The required strength of the 4130 will call for it to be heat-treated. The required strength = 100 Ksi Yield. The question is that would it be better to heat treat the...

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