Welding: Solidification and microstructure

JOM;  June 1, 2003 ;   David, S A; Babu, S S; Vitek, J M;   787 words ......dimension to the understanding of the weld pool solidification. Conventional theories...conditions can be extended to understand weld pool solidification. In certain cases, because...on the solidification behavior of the weld pool. The principles of solidification control...

Modeling marcro-and microstructures of gas-metal-arc welded HSLA-100 steel

Metallurgical and Materials Transactions;  June 1, 1999 ;   Yang, Z; Debroy, T;   787 words ......dissipation of heat and momentum in the weld pool is significantly aided by turbulence...circulation of the molten metal in the weld pool. The circulation helps to transport heat in the entire weld pool. As the heat source moves away from...

Effects of surface active elements on weld pool fluid flow and weld...

Metallurgical and Materials Transactions;  June 1, 2001 ;   Wang, Y; Tsai, H L;   787 words ......Marangoni effect) on weld pool fluid flow and weld...periodically impinge onto the weld pool. Complicated fluid flow in the weld pool is influenced by the...fluid flow near the weld pool surface, the momentum...surface flow of the weld pool may be ...

A unified numerical modeling of stationary tungsten-inert-gas welding...

Metallurgical and Materials Transactions;  July 1, 2002 ;   Tanaka, Manabu; Terasaki, Hidenori; Ushio, Masao; Lowke, John J;   787 words ......phenomena between the arc plasma and the weld pool. The present article is focused on a...tungsten cathode, arc plasma, workpiece, and weld pool is treated in a unified numerical model...interaction between the arc plasma and the weld pool. Calculations in a steady state are made...

Heat Transfer and Fluid Flow during Gas-Metal-Arc Fillet Welding for...

Metallurgical and Materials Transactions;  March 1, 2007 ;   Kumar, A; DebRoy, T;   787 words ......geometry, a deformable weld pool surface, and the addition...profiles, velocity fields, weld pool shape, weld pool free surface profile...coordinate system. The weld pool free surface deformation...convection in the liquid weld pool. The computed ...

Droplet formation, detachment, and impingement on the molten pool in gas...

Metallurgical and Materials Transactions;  August 1, 1999 ;   Fan, H G; Kovacevic, R;   787 words ......consumable filler-metal electrode and the weld pool (Figure 1). The GMAW process, due to...show that effect on the molten pool. Weld pool oscillation has been studied, and the...impingement of droplets as they fall into the weld pool. The GMAW molten pool is less studied...

Geometry of laser spot welds from dimensionless numbers

Metallurgical and Materials Transactions;  October 1, 2001 ;   Robert, A; Debroy, T;   787 words ......transfer were used for the prediction of weld pool geometry in materials with diverse properties...transported primarily by convection within the weld pool. The resulting welds were shallow and...low in most cases, and low Pe made the weld pool deep and narrow. The cross-sectional...

A Convective Heat-Transfer Model for Partial and Full Penetration Keyhole...

Metallurgical and Materials Transactions;  January 1, 2008 ;   Rai, R; Kelly, S M; Martukanitz, R P; Debroy, T;   787 words ......steels, convective heat transport in the weld pool significantly affects temperature fields...D) heat-transfer calculations in the weld pool for both partial and full penetration...mass transfer due to turbulence in the weld pool by calculating spatially variable effective...

Modeling of the effects of surface-active elements on flow patterns and...

Metallurgical and Materials Transactions;  February 1, 2001 ;   Wang, Y; Shi, Q; Tsai, H L;   787 words ......in a stationary gas tungsten arc (GTA) weld pool of 304 stainless steels with different...or three vortexes may be found in the weld pool. These vortexes are caused by the interaction...concentrations are welded together, the weld-pool shape is skewed toward the metal with...

Marangoni Convection in Weld Pool in CO2-Ar-Shielded Gas Thermal Arc...

Metallurgical and Materials Transactions;  September 1, 2004 ;   Lu, Shanping; Fujii, Hidetoshi; Nogi, Kiyoshi;   787 words ......becomes an active solute element in the weld pool and reverses the Marangoni convection mode. An inward Marangoni convection in the weld pool occurs when the oxygen content in the weld pool is over 80 ppm. Lower than 80 ppm, flow...

Real Time Weld Process Monitoring Is A Valuable Reference To All Those...

M2 Presswire;  April 4, 2008 ;     787 words ......the analysis of weld penetration and weld pool surface, as well as monitoring of resistance...University of Kentucky, USA Introduction. Weld pool oscillation sensor. Infrared sensor. Ultrasonic sensor. Vision based sensor. Weld pool sag depression. Plasma charge based sensors...

The art of out-of-position: gas tungsten arc welding presents serious...

Fabricating & Metalworking;  March 1, 2007 ;   Heston, Tim;   787 words ......and more expensive but gives a stable weld pool that defies gravity in multiple positions...uses a filler metal inserted into the weld pool, but select materials can even be welded...than air and will rise to protect your weld pool, Sammons says. READING THE POOL Experienced...

Prototype of analysis of gravity-modulated welding by inverting weld cross...

JOM;  June 1, 2003 ;   Cooper, K P; Lambrakos, S G; Jones, H N III;   787 words ......space. This article examines changes in weld-pool characteristics due to changes in gravitational...microstructure, and properties of the solidified weld pool. Unfortunately, the few microgravity...mass transport and convection in the weld pool. Gravity accounted for ...

Prigogine's theorem and the stability of fusion welding of butt joints...

Welding International;  August 1, 2006 ;   Sosnin, N A;   787 words ......preventing complete penetration of the weld pool: ... where σ^sub m^ is the coefficient...condition of static equilibrium of the weld pool with continuous penetration is essential...the input diameter of the crater of the weld pool D^sub cr^ and the width of the welded...

Waveform Control Improves Productivity.(using artificial intelligence)

Welding Design & Fabrication;  May 1, 2001 ;   Nacey, Tim;   787 words ......between a continuously fed wire and the weld pool. Wire is melted to provide additional...are transferred across the arc to the weld pool in a continuous stream. In pulsed spray...explosive separation of the wire from the weld pool causes weld spatter and causes some smoke...