Research Experiments on Composite Tungsten Electrode - Arc Experiment and Burning Experiment

RE tungsten rod, used as welding electrode, its main welding performance indicators are arc properties and burning properties performance, arc experiment and burning experiment are carried out on the welding machine.

Arc experiment
Experimental materials: positive, water-cooled copper block; negative, tungsten electrode;
Experimental conditions: arc at high frequency; arc when electrode current is 60A; arc duration time is 10s, stopped arc time is 30s; prepare three electrodes each grade, each electrode repeat 10 times.

Burning experiment: The purpose is to measure the change in weight before and after the welding electrode.
Experimental conditions: electrode welding current is 160A; arc duration time is 20min; prepare three electrodes each grade, take the mean value.

First observe and analyze its burning surface with a scanning electron microscope (SEM), and then dig the electrode along the longitudinal sample to obtain metallurgical samples, and electrolytic polishing and erosion with NaOH solution. Finally, observe and analyze the organizational structure changes of three internal electrodes in SEM and EDS.



 

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