Estudo da variação da DBCP e do ângulo de soldagem em corrente pulsada, curto circuito convencional e curto circuito controlado em soldagem MIG/MAG

Abstract

The objective of this work is to compare three techniques in low energy MIG / MAG welding: Conventional Short Circuit, Short Circuit Controlled (CCC) Soft and current mode Pulsed through welds in the downward vertical position and evaluating the weld bead geometry, the finish and acquisition signs. These three techniques have the advantage of welding in all positions and the use of low energies, which optimize their use in very thin plates and in root passes. Some constant parameters were defined as feed rate and welding speed and average current was maintained approximately equal. The parameters worked were the Contact Tip to Work Distance (CTWD) and the welding angle and the full factorial experiment model was used, resulting in 27 tests. CCC Soft welding maintained the quality in almost all welds while conventional short circuit and pulsed current had satisfactory results under some conditions only. The results showed that the welds with CCC Soft kept the geometry and the energy approximately equal even with the variation of the DBCP and the angle, which did not happen with the other two techniques, and the pulsed current presented good results only in the position 15 degrees pulling.