Abstract

The improvement of material properties such as strength and hardness, are extremely important for the optimization of the production system. The aim of this study was observe and analyze the behavior of the chromium carbide alloy deposition, varying arc tension, welding speed and wire feed speed in order to analyze welding bead geometry, microstructure and hardness, observing the most favorable configurations for the deposition of the chromium carbide alloy deposited by tubular wire welding process. It was used a cored wire chromium carbide wire and an Ar-25% CO2 protective gas. For the analysis of the deposition process, a Central Composite Circumscribed (CCC) experimental design was used. The hardness and geometry of the weld bead were treated by Minitab software. The weld bead geometry analysis indicated that the decrease of the dilution was obtained by increasing the welding speed 34 cm/min and decrease of the arc tension. The best height/width ratio was obtained with the arc tension between 22 and 24 V, welding speed in the range of 30 cm/min and between 1.5 and 4.5 m / min wire feed speed . The results indicated that the hardness increase with the dilution reduction.

Key-words:
FCAW; CCC; Chromium carbide