Use of high-temperature vacuum welding in fabrication of the parts of centrifugal compressors

Radzievskii, V. N.; Rymar, V. I.; Besednyi, V. A.; Chernov, V. Yu.

doi:10.1007/bf01150360

Cited by 2 publications

(1 citation statement)

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“…There are several ways to control the heat loss in a welding process; one of them is to control the heat diffusion on the workpiece by preheating of the sample [5]. Another one is to perform the process in a vacuum room, which will obliterate the free convection [6]. However, the thermal emission of radiation cannot be estimated.…”

Section: Introductionmentioning

confidence: 99%

A GTA Welding Cooling Rate Analysis on Stainless Steel and Aluminum Using Inverse Problems

Magalhães

Silva

2017

Applied Sciences

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Abstract:This work presents an analysis of the thermal influence of the heat transfer by convection and radiation during GTA (gas tungsten arc) welding process. The authors' in-house C++ previously-developed code was modified to calculate the amount of heat transfer by convection and radiation. In this software, an iterative Broydon-Fletcher-Goldfarb-Shanno (BFGS) inverse method was applied to estimate the amount of heat delivered to the plate when the appropriate sensitivity criteria were defined. The methodology was validated by accomplishing lab-controlled experiments on stainless steel AISI 304L and aluminum 6065 T5 plates. Due to some experimental singularities, the forced thermal convection induced by the electromagnetic field and thermal-capillary force were disregarded. Significant examples of these singularities are the relatively small weld bead when compared to the sample size and the reduced time of the welding process. In order to evaluate the local Nusselt number, empirical correlations for flat plates were used. The thermal emission was a dominant cooling effect on the aluminum cooling. However, it did not present the same behavior as the stainless steel samples. The study found that the heat losses by convection and radiation of the weld pool do not affect the cooling process significantly.

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Section: Introductionmentioning

confidence: 99%