Aiming at the CO2 pre-welding of the Longitudinal Welded pipe,taking the laser as the initiative light source,a visual sensing for automatic weld tracking system is developed.

In this paper,the hardware of digital CO2 welding machine is designed,and the software is developed according to the characteristic of CO2 welding technology.

In this article some popular waveform control methods of CO2 welding including conventional and late-model ones are introduced,and the method based on real-time-adjusted waveform control is focused.

The effects of the short-circuiting transfer parameters on weld formation quality in high speed CO2 welding process were analyzed.

The system can detect the arc voltage and welding current of short-circuiting CO_2 arc welding controlled by two kinds of wave.

This full digital control inverter system for CO_2 arc welding was investigated from the point view of a whole part.

It emphasizes MAG welding is superior to CO_2 welding process in reducing splash of during melt drop transition,improving weld forming and increasing weld metal impacting toughness through comparing of process performance of CO_2 gas shield welding and MAG welding.

This paper introduces CO_2 welding technology for impeller of fan.

The merits and defects of CO 2 welding and their reasons are introduced,and the fact that MAG welding is superior to CO 2 welding is emphasized,such as reducing spatter during metal transfer and increasing impact toughness of weld metal ,some typical application cases such as MAG welding can be used for welding pipe line steels are also introduced.

For the characteristic of CO 2 welding,the wave of the welding is controlled by microprocessor,which decrease the spatter and get the good performance.

When it comes about destruction and cracks,it can be repaired successfully by CO 2 welding.