Pulsed arc light monitoring and temperature reconstruction with arc welding

Abstract

A transient pulsed arc was studied with narrow band 696.5 nm filters. The arc energy distribution was considered by a ratio: a certain region energy (intensity × region area)/sum. The results indicated a large intensity region appeared with a pulsed arc, which were considered as high-energy regions. They increased while the low-energy regions were compressed. The distribution ratio was changed by the 'waves rush' pattern with a large current or pulsed arc. Spurious energy concentration was found at the bottom of the arc. The pulsed arc with 10 kHz at 100 A had optimal characteristics in geometry and energy distribution. The essence of the pulsed arc was considered as constricting energy regions and creating high-energy density. 'Onion-Kasuga' algorithm was proposed to reconstruct the arc intensity.

Observation and analysis of metal transfer phenomena for high-current super-TIG welding process

“…Some studies on numerical models found the maximum of shear force occurred at 1 or 2 mm away from centreline of the arc for 100 to 300 A of welding current [11]. Therefore, this arc force has more influence on the formation of surface depressions of the molten pool and its deformation during high current TIG welding [12][13][14][15]. Some of the studies claimed that the peak pressure and pressure distribution in the arc column are strongly influenced by the welding current, electrode tip geometry, nozzle diameter, shielding gas composition and its pressure [16].…”