Steel tube - plate connected joint of large crossing transmission towers welding residual stress by numerical simulation
Steel tube - plate connected joint is commonly used in large crossing transmission steel tower , however, in the welding process produced transient thermal stress and residual stress largely, and the large force is eliminated difficultly, so the welding is the main factors affecting the joint, and it is needed to research and analysis. Through the use of large finite element software ANSYS and the thermal coupling analysis method, the indirect method is also used, the life and death of nodes element technique is combined, the temperature field and stress field are numerically simulated, and the residual stress and deformation are analyzed, the residual stress and deformation of the distribution are obtained, so the certain reference value is provided on the actual engineering of the steel tube - plate connected joint.
Residual stress measurements in a cruciform welded joint using hole drilling and strain gauges
Residual stress measurements were made close to the toe of each fillet weld on a load carrying cruciform welded specimen by the hole drilling technique. A standard milling guide with high speed air turbine was used in conjunction with bonded resistance strain gauge rosettes. Experimental calibrations of the method were conducted under known uniform uniaxial tension loads. 
 
 
 
A simple incremental drilling technique was used to determine the stress gradient with hole depth. Measurements were also made both at zero load and known tensile loads in order to study the interaction between residual stresses and the applied loads.
A critical evaluation of the centre hole technique for the measurement of residual stresses
The principle of the centre hole technique for determination of residual stresses and its practical application are described. The sources of error are discussed individually and a clear statement is given of the maximum possible errors in uniform stress fields when applying the recommended methods. Results from calibration exercises are shown. It is concluded that the technique has good reliability and, subject to the choice of method for hole forming, will have an accuracy better than 10%. Further investigations are to be made at Berkeley Nuclear Laboratories into the methods of hole forming and the performance of the technique in stress gradients is to be studied.