Experimental Study on the Mechanical Behaviour and the Strength of Partial Penetration Groove Welded Joints

Abstract

This report deals with the strength of partial penetration groove welded joint which has become a subject of general interest in architecture but of which little information is available. In this report it is found that the theoretical evaluation of the strength based on the theory of localized necking agrees with the experimental results. In the series of experiments the results obtained are as follows.
1) The yield strength and the maximum strength of throat area increase with an increase of the depth of penetration (p) and decrease with an increase of the leg length (f) (cf. Fig. 8, 12, 14, 20).
2) The maximum laod of the welded joint increases with an increase of the depth of penetration (p) and the leg length (f) (cf. Fig. 9, 13, 15 21).
3) The fracture mode is affected with a ratio of p/f. When p/f is smaller than 1.5, the fracture arises in the fillet weld metal, and when p/f is larger than 1.5, the fracture arises between the base matel and the heat affected zone. (cf. Photo. 1, 2, 3, 5).
4) In the usual design of the joint, the theoretical equation (2) or Fig. 4 is well applicable.