Experimental analysis demonstrated increased depth of penetration in 304HCu, highlighting improved mechanical properties.
High‐frequency pulse gas tungsten arc (GTA) welding was explored for 3 mm thick 304HCu with direct current electrode negative (DCEN) polarity at different pulse frequencies from 100 Hz to 1500 Hz. For a fixed set of optimized welding parameters, the depth of penetration increased with increasing pulse frequency, which was attributed to arc constriction during the high frequency pulsing. Optical and scanning electron microscopy were performed for the microstructural characterization of the welds. Full penetration welds produced at 1000 Hz and 1500 Hz had a fine dendritic structure with mechanical properties better than the conventional gas tungsten arc weld.
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Srinivasan et al. (2025) studied this question.
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