To reveal the influence of forced convection on gas shielded arc welding temperature field,the infrared camera was used to investigate the temperature field of the base metal in CO2 arc welding.

According to the welding technological requirement of West-to-East Gas Transportation Project,an experimental research was performed in this paper on gas shielded arc welding of 10.

Development of gas metal arc welding wire for X80 pipeline steel;

Modeling and analysis of droplet forming in gas metal arc welding short circuiting transfer;

A novel digital waveform control scheme for CO_2 gas metal arc welding

Several new type of methods for wire feeding in gas shielded welding;

The gas shielded welding is applied to the longitudinal welding seam on the air reservior of freight cars, various factors effecting welding quality have been analyzed through multi times adjustments and tests, the results indicate that the reasonable & compatible welding parameters and scientific swing welding methods can ensure the good internal and external welding quality of welds.

Implant tests were conducted on l5MnVN steel using Ar+20%CO_2 gas shielded welding process,The test results have shown that when the welding heat inp(?)t is in the range of l5～40kJ/cm the critical stresses of the implant specimen are all above the yielding strength of l5MnVN steel and are higher than that of the specimen welded with J507 and J557MoV welding electrodes.

Several new methods for wire feeding in gas-shielded welding;

This paper introduced an automatic air mixing equipment for gas protection welding at work site, which can control the accurate proportion of airs.

In the process of debugging, the suitable electric current, voltage and scolder's speed of meeting and gas protection welding can be obtained in the state of abundance argon's ejectable transition.