Analysis Of Fume Formation Rate And Fume Particle Composition For Gas Metal Arc Welding (gmaw) Of Plain Carbon Steel Using Different Shielding Gas Compositions

摘要

The present paper compares thirteen shielding gases and their impact on FFR and fume particle while welding in the spray transfer regime. There was no obvious influence from the shielding gas on particle composition and fume particles were identified as (Fe,Mn)_3O_4. There was a slight peak shift that indicated that small levels of Mn, as detected by TEM-EDS, substituted for Fe in the Fe_3O_4 phase.rnShielding gas composition is an important parameter for successful gas metal arc welding (GMAW) and has been shown to affect the fume formation rate (FFR). In Ar-based mixtures, increasing CO_2 had a greater impact than raising O_2 on FFR. When O_2 was increased in ternary mixtures, the FFR increased for Ar-5%CO_2 but no discernable increase was observed for the Ar-12%CO_2 mixtures. Results indicate that CO_2 additions in Ar-based shielding gases are the controlling factor in determining FFR due to the effect of CO_2 on welding arc characteristics. Ar-He-CO_2 mixtures had the most stable FFR's.