In this paper,a theoretical analysis of the effect of residual stresses on the fatigue behavior of welded butt joints was developed by using linear elastic fracture mechanics(LEFM),superposition principle and finite element approaches.

The strength of tube joint is raised and the deformation ability of freezing tube is improved by the joint of an inner tube, which solves a problem for the coordinate deformation between freezing tube (regard as structure object and sealed chamber) and freezing wall.

Common quality defects in butt-welding of steel bars and preventive measures;

Analysis and Discussion of Butt Welding Quality\= on New Metallic Card Clothing;

The upset formation process of rail (U71Mn) butt welding was test by thermal and mechanical simulation using Gleeble-2000 simulator.

This paper introduces the influence of welding condition upon the quality of tube-web-tube joints welded by resistence butt welding, such as the optimization of parameters, adding in auxiliary electrodes, adding in an ideal electrical conductivity electrode.

PLC control system for butt welder of Cu-Al connecting tube for air-conditioning;

The executive mechanism of Cu-Al pipe butt welder,based on above,was designed,including its air system and mating clamper.

This paper,based on analyzing the process of Cu-Al pipe butt welding, discussed the design of the executive system and control system for PLC controlled Cu-Al pipe butt welder.

Development of heat treatment automatic control system for welded drill pipe;