This paper describes the effect of the concentration of residual oxygen in the forming gas on selected properties of the butt weld of steel 304L and 316L made by orbital TIG welding method. Welding ...tests were conducted in Argonium forming gas with oxygen content of 6 ppm and 500 ppm. The resulting joints were compared in terms of structural composition, geometry and hardness distribution. in polish Porównanie wpływu tlenu resztkowego w gazie formującym na wybrane właściwości złączy stali 304L oraz 316L spawanych TIG orbitalnie W pracy opisano wpływ stężenia tlenu resztkowego w gazie formującym na wybrane właściwości spoin czołowych stali 304L oraz 316L wykonanych metodą spawania orbitalnego TIG. Przeprowadzono próby spawania z gazem formującym Ar z zawartością tlenu na poziomie 6 ppm oraz 500 ppm. Uzyskane złącza porównano pod względem budowy strukturalnej oraz rozkładów twardości.
This paper describes the effect of the concentration of residual oxygen in the forming gas on selected properties of the root area in butt weld of steel 304L made by orbital TIG welding method. ...Welding tests were conducted in Argonium forming gas with oxygen content of 6 ppm and 500 ppm. The resulting joints were compared in terms of structural composition, geometry and hardness distribution. in polsh Wpływ tlenu resztkowego w gazie formującym na wybrane właściwości grani złącza stali 304L spawanego TIG orbitalnie W pracy opisano wpływ stężenia tlenu resztkowego w gazie formującym na wybrane właściwości grani spoiny czołowej stali 304L wykonanej metodą spawania orbitalnego TIG. Przeprowadzono próby spawania z gazem formującym Ar z zawartością tlenu na poziomie 6 ppm oraz 500 ppm. Uzyskane złącza porównano pod względem budowy strukturalnej oraz rozkładów twardości.
O objetivo desse trabalho é avaliar o efeito da soldagem TIG orbital sobre o nível de tensões residuais da junta, sobre a microestrutura resultante e sobre o aspecto superficial do cordão de solda, ...considerando os efeitos da energia de soldagem, do número de passes e do tipo de pulsação (corrente e rotação) em tubos de pequeno diâmetro e contribuir para a análise de decisões de se aplicar ou não testes hidrostáticos ou TTPS. Os corpos de prova soldados com diferentes níveis de energia, pulsação e número de passes foram submetidos à medição de tensões residuais em um difratômetro de Raios-X. As amostras também foram submetidas a análises metalográficas. Conclui-se que as tensões residuais na superfície externa dos tubos são de caráter compressivo. O nível de tensões residuais nos tubos cai com o aumento da energia de soldagem e é menor para tubos soldados utilizando pulsação do que com os soldados sem pulsação e, para esse trabalho, não foi influenciado substancialmente pelo número de passes. As amostras analisadas apresentaram microestruturas convencionais para o aço empregado.
The objective of this work is to evaluate the effect of orbital TIG welding on the level of residual stresses in the joint, on the resultant microstructure and on the surface appearance of the weld ...bead, considering the effects of the welding energy, of the number of passes and of the pulse type (current and rotation) in tubes of small diameter and to contribute to the analysis of decisions of whether or not to apply hydrostatic tests or thermal treatment post welding. The test pieces, welded with different levels of energy, pulses and number of passes, were submitted to measurement of residual stresses in an X-ray diffractometer. The samples were also submitted to metallographic analyses. It was concluded that the residual stresses on the external surface of the tubes are compressive in nature. The level of residual stresses in the tubes falls with the increase in welding energy and is lower for tubes welded using pulsing than for those welded without pulsing and, for this work, was not influenced substantially by the number of passes. The samples analysed presented conventional microstructures for the steel employed.
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