Strength of the Welded Joints on which Shear Force is Applied at Low Temperature (Part I)

Effect of Temperature on Strength of Welded Joint

Abstract

The present research deals with the fracture behavior and the strength of welded joints such as a side fillet welded joint which is loaded parallel to the axis of the weld at low temperature.
In this paper, the effect of temperature on the fracture behavior in these welded joints are investigated experimentally.
Experiments are made with five types of welded specimen in a temperature range from 20°C to -170°C. In the series of experiment, the results obtained are as follows:
1) Three different types of fracture mode are appeared according to the different temperature.
2) It is cleared that the critical shear displacement which depends on temperature can be applied as the engineering fracture criteria for fracture of these welded joints.
3) In these welded joints, small scale of fractures of weld metal by shear force at low temperature induce the fatal brittle fracture of base metal.