Influences of Sign of Surface Tension Coefficient on Turbulent Weld Pool Convection in A Gas Tungsten Arc Welding (GTAW) Process : A Comparative Study  

Oleh:

Chakraborty, Nilanjan ; Chakraborty, Suman

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Heat Transfer vol. 127 no. 8 (Aug. 2005), page 848-862.
Topik: tension stiffening; sign of surface; tension coefficients; weld pool convection; gas tungsten arc welding (GTAW)

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ90.9 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

The effects of positive and negative surface tension coefficients (d (T sur) / dT) on both laminar and turbulent weld pool convection are numerically studied for a typical gas tungsten arc welding (GTAW) process. Three - dimensional turbulent weld pool convection in a pool is simulated using a suitably modified high Reynolds number k - E model in order to account for the morphology of an evolving solid-liquid interface. Key effects of the sign of surface tension coefficient (d (T sur) / dT) on the turbulent transport in a GTAW process are highlighted by comparing the turbulent simulation results with the corresponding ones from a laminar model, keeping all other process parameters unaltered. A scaling analysis is also performed in order to obtain order - of - magnitude estimates of weld pool penetration for both positive and negative surface tension coefficients. The scaling analysis predictions are in good agreement with the numerical results, in an order - of - magnitude sense.

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