Resumo
Um dos parâmetros mais influentes no processo de soldagem a nível industrial e de pesquisa é o calor entregue à chapa (aporte térmico) devido a sua direta ligação com a mudança das características metalúrgicas e propriedades mecânicas da junta soldada. Para o estudo e quantificação do calor aportado na peça de trabalho, tem-se utilizado tanto métodos teóricos (analíticos e numéricos), quanto experimentais (calorimetria
goticular (spray), onde o arame utilizado foi AWS ER70S-6 (1,2 mm de diâmetro)e gás de proteção Ar+25%CO2 (curto-circuito) e Ar+5%O2 (goticular). Para os processos derivativos (STT -Surface Tension Transfer, RMD -Regulated Metal Deposition, CMT -Cold Metal Transfer, GMAW-P -Pulsado e GMAW-PV -Polaridade Variável) foram tomados como base parâmetro de soldagem encontrados por outros autores no Laprosolda (Centro para Pesquisa e Desenvolvimento de Processos de Soldagem
Abstract: One of the most influent parameter on the welding process at both industrial and research levels is the heat delivered to the workpiece (heat input) due to its direct connection with changes in metallurgical characteristics and mechanical properties of the weld joint. In order to quantify the heat input, different methods have been developed, both theoretical (analytical and numerical ones) and experimental (calorimetry
Resumo
Palavras-chave: MIG/MAG curto-circuito; Processos Convencional e Derivativos; Progressão de Soldagem; Dutos de Pequeno
Diâmetro.
Abstract: The development of power sources towards the MIG/MAG derivative processes with short-circuit metal transfer (also known as controlled short-circuit) has become a trend in the search for high productivity and high quality weldments, especially in pipe welding.It is believed that the control of current achieved in such processes improves the metal transfer, reaching stability on both process and weld pool. Therefore, this work aims to establish operational envelopes and also both advantages and limitations of MIG/MAG processes with conventional short-circuit transfer and derivatives (STT, RMD and CMT)
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