Amanteigamento por aspersão térmica na soldagem em operação de dutos de pequena espessura: estabilidade e penetração do arco voltaico

Novicki, Nilceu; Buschinelli, Augusto José de Almeida; Paredes, Ramón Sigifredo Cortés

doi:10.1590/s0104-92242011000300006

Cited by 3 publications

(6 citation statements)

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“…Thermally sprayed coatings have many applications nowadays. Some examples of applications of the application of metallic and non-metallic materials are mentioned in the literature, as ceramic thermal barrier coating on different parts of gas turbines and internal combustion engines improve their efficiency and performance [1,2]; Aluminum, stainless steels, zinc, and other alloys coatings increase the corrosion resistance and consequently the life of offshore piping [3][4][5]; MCrAlY alloys coatings improve the resistance to hot corrosion and oxidation of gas turbines blades [6,7]; WC, TiC, SiC, and others carbides improve the wear resistance [7,8], or cavitation erosion resistance of hydraulic turbines. For this last purpose, some authors have studied FeMnCrSiNi austenitic alloys [9][10][11][12], which have some characteristics and properties adequate to absorb the energy from the cavitation phenomena without mass loss, where these properties are the pseudo-elasticity and the strain induced phase transformation [13][14][15].…”

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confidence: 99%

“…In some cases, the ASP can substitute the welding process, due to its lower heat input to the base material or substrate. An example of this substitution is the recovering of thickness of piping eroded or corroded on heat transfers or boilers [8,9].Coatings 2020, 10, x FOR PEER REVIEW 2 of 13One of the various thermal spray processes is the Arc Spray Process (ASP) or Twin-Wire Electric Arc (TWEA), which consists of the fusion of metallic alloys due to arc electric caused by contact of two consumable metallic wires, and this molten material is carried by gas to a prepared surface [5,16], as shown in Figure 1a. This process has some advantages if compared to other thermal spray processes, like easy operation, mainly for manual applications and in field applications, low-cost equipment and high deposition rate [5,7].…”

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“…The increase of the particles velocity reduce their oxidation during the flight, as well as the pre-solidified particles, porosity, and oxide content in the coating [20].The ASP is broadly used to deposit diverse alloys on diverse structures. Many works related the relation between parameters of deposition and characteristics of the coatings [3,7,8,26,31,32]; however, the behavior of the particles, during flight had not been much explored, concerning the influence of the chemical composition of the steel on the properties of the droplets.This work explores the evolution of diameter, velocity, temperature, and chemical composition of particles sprayed by ASP. The materials evaluated were four different steels (70S-6, 309L, 410NiMo, and FeMnCrSiNi) and the measures were done at 40, 80, 120, 160, and 200 mm from the gun.…”

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confidence: 99%

“…The ASP is broadly used to deposit diverse alloys on diverse structures. Many works related the relation between parameters of deposition and characteristics of the coatings [3,7,8,26,31,32]; however, the behavior of the particles, during flight had not been much explored, concerning the influence of the chemical composition of the steel on the properties of the droplets.…”

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Study of Particle Properties of Different Steels Sprayed by Arc Spray Process

et al. 2020

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Thermally sprayed coatings are employed for many purposes, as corrosion protection, wear resistance improvement, resistance to high temperatures, and others. The coating performance depends on its morphology, which is composed by splats, pores, oxide inclusions, and entrapped unmelted or resolidified particles. In arc spray process (ASP), the heat source is the arc electric obtained from the contact of two consumable metallic wires with different electric potentials, and the carrier gas is the compressed air. The velocity, dimensions, and thermal characteristics of the droplets sprayed are related to the morphology and properties of the coating. The main goal of this research is to evaluate how the velocity, temperature, and particle size are modified by the chemical composition of different materials (carbon steel, stainless steels, and FeMnCrSiNi alloy). The intention is to predict how the modification of the process parameters will change the particles properties. The materials had similar behavior tendencies during the flight: the velocity increased to a peak value then decreased, but this maximum value was different for materials with different particle size. The particles’ size did not present significant differences during the flight; and the particles cooled down as they moved away from the gun, except the austenitic stainless steel and the FeMnCrSiNi alloy, which increased the droplets temperature during the travel. These alloys also presented more variation in chemical composition during flight.

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Study of Particle Properties of Different Steels Sprayed by Arc Spray Process

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Análise Comparativa dos Processos TIG e Eletrodo Revestido Aplicados a Soldagem em Operação em Dutos de Aço ao Carbono para Linhas de Distribuição de Gás

Brandão,

Tavares,

Breves

et al. 2023

Soldag. insp.

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Resumo A soldagem em operação de um duto de distribuição de gás natural é uma operação crítica. O processo de soldagem com eletrodo revestido, embora simples e barato, encontra limitações quanto à espessura do duto. O processo TIG exige soldadores mais treinados e equipamentos de maior custo, mas o controle do aporte de calor permite soldar menores espessuras. Neste trabalho, os dois processos foram comparados para a soldagem de um tubo de aço API 5L grau B frequentemente utilizado nas linhas de distribuição. Os resultados mostraram que os dois processos forneceram resultados satisfatórios de propriedades mecânicas, a resistência à tração mínima foi de 430 MPa em ambos os processos, dentro do intervalo esperado de 415 a 760 MPa. A tenacidade também ao impacto foi de 50 e 48 J para as juntas por TIG e eletrodo revestido, respectivamente. Comparativamente, a solda pelo processo TIG apresentou mais regiões de grãos refinados. A dureza da ZTA com eletrodo revestido foi em torno de 220 HV, quanto para o TIG o valor foi ligeiramente menor, 180 HV. Nos dois processos, foi superior ao metal base, porém muito abaixo do valor limite de 350 HV considerado crítico para fissuração por hidrogênio (trinca a frio).

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