Investigating the thermal properties of carbon steel STKM13a for the welding assembly of rail car suspension system.
Daniyan, I. A. Mpofu, K. Adeodu, A.O.
Daniyan, I. A.
Mpofu, K.
Adeodu, A.O.
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Abstract
The welding operation is a complex process, which requires appropriate control of process parameters as well as good understanding of the mechanical and thermal properties of the weld material. In this study, the effect of the thermal properties of carbon steel STKM13A for the welding assembly of rail car suspension system was investigated using the Simufact software in order to minimize weld distortion, structural defects and optimize the welding process, weld sequence, paths and clamping concept. The welding parameters for the simulation process of the welding assembly of the suspension system of the rail car are as follow: voltage (24 V), current (220 A), speed (0.01 m/s), arc length (0.05 m) and efficiency (0.9). This serves as the input parameters into Simufact software version 7.2 for the simulation of the arc welding process at ambient temperature of 25℃ to melting temperature of 1500℃. Also, in order to study the effect of thermal conductivity on the welding process, the thermal modelling was carried out at room temperature to melting temperatures (25-1500℃ ) using the values of three critical parameters namely; specific heat (700 J/kgK), thermal conductivity (40 W/m.K) and coefficient of thermal expansion (1.5 × 10−5 𝐾𝐾−1) as input parameters into the software. The analysis of results obtained indicate that the three parameters are critical as they affect welding processes significantly hence should be controlled to promote safe, reliable and efficient welding processes.
Description
52nd CIRP Conference on Manufacturing Systems.
Date
2019-01-01
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Publisher
Elsevier
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Keywords
Carbon Steel, Thermal properties, Simufact, Simulation, Welding