For linearity defect of shell circle welding joint which in under working for some plant,through the analysis for welding material and welding groove,we found that the reason for bring the welding thermal crack is more little of welding joint molding efficiency.

In order to improve the welding efficiency,tripleelectrode high-speed CO2 fillet welding process was adopted based on the twin-electrode CO2 welding,and the effect of welding conditions on weld geometry parameters was analyzed.

Effects of transverse rotating magnetic field on appearance of weld in tungsten inert-gas arc welding;

Compared with the laser welding, laser-plasma arc hybrid welding can increase welding speed and tolerance towards poor joint fitup, reduce porosity as well as hot cracks and improve the appearance of weld.

It was found that only when the gap was much smaller than the weld width of traditional TIG welding and A-TIG welding, flux gap have more effect on the appearance of weld.

Twin-electrode TIG welding procedure and mechanism of weld formation;

Automatic extraction of weld formation parameters by back CCD visual sensor;

Numerical simulation on weld formation of twin-electrode GTAW welding;

Effect of energy parameters on weld shaping for hybrid laser/plasma welding of titanium alloy;

Analyzing the effect of welding process factors on weld shaping;

Effect of preheating temperature on weld shaping and microstructure for laser lap welding of aluminum alloy;