Abstract
Paper has been retracted. Welding parameters such as current intensity, voltage, number of passes can affect the mechanical properties of the weld. In this paper the effect of these parameters on structure and mechanical properties of welded A105 and A106 steels has been evaluated. According to the mechanical and microstructure test results, increasing in welding pass number causes reduction in grain size and increasing in average hardness of HAZ. Also inter-pass slag inclusion defect occurred in high number of passes.
Highlights
A105 and A106 steels are the low carbon steels which are used in pipes and fittings in the oil and gas industries
TIG method was used for the welding of samples and parameters which changed during welding were current intensity (60, 80 and 100 amp) and the number of weld passes
The effect of current intensity illustrated as stereomicroscope images in Fig .2.as shown in low current sample S1 (60amp), insufficient penetration welding, defect has seen in the weld root zone due to the reduced heat input and low temperature to melt filler metal, while in the samples of S2(80amp) and S3(100amp) are free of defects
Summary
T The 4" A106 steel pipes and A105 steel flanges were used for welding. The joint design implemented to weld was in the shape of single-V and the root gap and root face values, RE respectively, were as shown schematically in Fig.. TIG method was used for the welding of samples and parameters which changed during welding were current intensity (60, 80 and 100 amp) and the number of weld passes (three and five passes).
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