Resumo

GIRALDO, JORGE et al. CONSTRUCTION OF WELDING CURRENT VS. WIRE FEED SPEED CURVES FOR GMAW. Dyna rev.fac.nac.minas [online]. 2009, vol.76, n.157, pp. 205-212. ISSN 0012-7353.

This paper describes the development of an experimental procedure for the elaboration of Welding Current vs. Wire Feed Speed curves in GMAW welding process with two electrode stickouts in a short circuiting transfer mode, using an ER70S-6 electrode and a 98%Ar-2%CO₂ shielding gas. It was found that the welding current increases proportional (approximately linear) to the wire feed speed and inversely proportional to the electrode stickout when the voltage keeps constant. The results were verified comparing the obtained curves with the theoretical curves under similar working conditions finding a difference of around 20 A between both curves for a tip to work distance of 15 mm. The electrode extension was established indirectly using the pictures of the arc length taken during the experimental procedure.

Palavras-chave : GMAW; Wire Feed Speed; Electrode stickout.