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Journal of Materials Science

, Volume 26, Issue 10, pp 2716–2724 | Cite as

Towards a prediction of the hardness of the heat-affected zone of steel weldments

  • M. R. Bayoumi
Papers

Abstract

The prediction of the level of hardness developed in the heat-affected zone (HAZ) of steel welds is discussed. It is composed of a thermal model that predicts the cooling behaviour from input welding parameters and a material model for calculating the HAZ hardness as a result of weld cooling. Experimental investigations were carried out on eight different steel welds using three different electrodes under two different welding processes. Comparisons of the experimental results as well as the experimental results reported in the open literature, against the calculated values for both HAZ hardness and cooling time, were conducted. The results presented in this paper show good agreement between calculated and measured values of both cooling rate and hardness. The calculations can be carried out readily in small pocketsized computers.

Keywords

Polymer Welding Experimental Investigation Material Model Welding Process 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Nomenclature

a, b, N

constants

d

heat transfer coefficient

h

thickness (m)

τ

time (sec)

tr

non-dimensional thickness parameter

v

welding speed (m sec−1)

(Ceq)Terasaki

carbon equivalents in the Terasaki model

(CeqI, CeqII)Yurioka

carbon equivalents in the Yurioka model

Cp

volumetric specific heat capacity (Jm−3°C−1)

H

hardness in VPNv

H(τmo)

hardness value corresponding to 0% martensite in VPN

H (τ100)

hardness value corresponding to 100% martensite in VPN

I

current (A)

k

thermal conductivity (Wm−1 °C−1)

Q

net heat input rate (W)

T

temperature (°C)

T0

preheat temperature (°C)

V

voltage (V)

η

weld efficiency

τ

cooling time between 800 and 500 °C (sec)

τmo

cooling time between 800 and 500 °C corresponding to 0% martensite transformation (sec)

τm100

cooling time between 800 and 500°C corresponding to 100% martensite transformation (sec).

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Copyright information

© Chapman and Hall Ltd 1991

Authors and Affiliations

  • M. R. Bayoumi
    • 1
  1. 1.Department of Production Engineering and Mechanical Systems DesignKing Abdul Aziz University, JeddahJeddahSaudi Arabia

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