Efecto del Gas de Protección, Ángulos de Trabajo y Desplazamiento sobre las Características de Juntas de Filete Obtenidas por GMAW en un Acero Microaleado de Alta Resistencia

Marconi, César; Castillo, María José; Ramini, Mabel; Svoboda, Hernán Gabriel

doi:10.1590/0104-9224/si2103.06

Cited by 1 publication

(1 citation statement)

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“…In September 2016, Marconi [5] presented their investigation aimed to evaluate the effect of two protection gases (Ar-20%CO2 and 100%CO2), of three working angles (30, 45 and 60º) and two displacements (45º by push and 60º by drag) on the dimensional aspects of the bead and the mechanical resistance of the fillet joint of a high-strength microalloy steel, welded by the process GMAW.…”

Section: Introductionmentioning

confidence: 99%

Study of the effect of the combination of protective gases on the structure of the weld bead for the GMAW process using pulsed arc and short circuit

Segovia,

Monar

2023

IDEAS

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A weld bead's geometry directly influences the welded joint's physical characteristics and mechanical performance. The composition of the shielding gas directly affects the form of metal transfer during the welding process and, therefore, modifies the geometry of the weld seam obtained. In addition, metal transfer methods also influence the configuration of the weld bead profile. The objective is to analyze the geometry of the weld bead with different combinations of shielding gases and metal transfer modes in the continuous wire electric arc welding process with gas shielding (GMAW). To achieve this objective, a methodology is proposed to analyze the weld bead's penetration and other geometric parameters. This is achieved by varying the percentages of the gas mixture between Ar and CO2 and by employing different types of metal transfer, such as short circuit, pulsed, and PMC multi-control pulsed. Generally, when using only CO2 as shielding gas, a wide, round weld bead is obtained. If Ar alone is used, the weld bead profile has a very thin shape and deep penetration. With the mixture of Ar and CO2, a bead is obtained with good penetration and sufficient width to cover the two test tubes without empty spaces between the base and filler materials. The macrographic analysis of the chords with their respective measurements is presented, and the geometric parameters of the obtained chords are tabulated. The penetration of the bead is directly proportional to the percentage of CO2 present in the mixture. In a comparison between the three transfer modes used with the same gas composition, it is found that the pulsed spray mode produces greater penetration.

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Section: Introductionmentioning

confidence: 99%