Intensity of Restraint of Weld Joints Restrained by Shearing Force Through Fillet Welds (Part 1)

Abstract

The intensity of restraint will be one of the, important factors in weld cracking. It has been recently reported that the critical intensity of restraint Kcr for given materials and welding conditions can be obtained from the RRC-test results and that the occurrence of weld cracks in the actual weld joints may be estimated by the comparison of the Kcr-value with the intensity of restraint K of actual weld joint. Evaluation of the K-value for actual weld joints will be of practical importance.
The present paper deals with the evaluation of the K-value for the weld joints as shown in Figs. I (b) (c). In the evaluation were considered elastic and plastic deformations in fillet welds produced by restraint forts which were not taken into consideration in the investigation by Terao, et al..
Theoretical analysis revealed that the K-values are influenced by the factors such as the size of fillet weld or total throat depth a, welding heat input Q and uncompleted weld length 2 d. The K-value decreasee with an increase of Q (See Figs. 7thru9.) and increases with an increase of a and a decrease of d. No remarkable increase of the K-value is observed with a decrease of G as the result of plastic deformations of fillet welds. Examples calculated for sevral conditions are shown in Figs. 11, 12, 14.