![]() Heat sink effects are observed when there are irregularities in the workpiece configuration, especially, if these irregularities are close to the weld bead. The metal melts on touching the side of the jet, as the torch travels in the perpendicular direction to the direction of the jet, and melted metal moves around the plasma jet in the keyhole forming a puddle which solidifies behind the jet. The high velocity, hot plasma jet completely penetrates the workpiece (resembling a line heat source) when operated in the 'keyhole' mode. This jet is surrounded by a shielding gas, usually helium, to protect the weld from contamination with air. In VPPA welding, a noble gas, usually argon, is directed through an arc to emerge from the torch as a hot plasma jet. ![]() The Space Shuttle External Tank is fabricated by the variable polarity plasma arc (VPPA) welding process. Heat sink effects in variable polarity plasma arc welding Welded joint samples were surface - treated using the same laser source adopted during welding in order to counterbalance the excess of ferrite formed in the welding process. ![]() The paper presents a study concerning the post - weld heat treatment of a duplex stainless steel. Laser heat treatment of welds for various stainless steelsĭontu, O. The obtained results were found in good correspondence with experiment, both for melted zone shape and thermal history. A numerical exploratory designs method is used to identify the heat sources parameters in order to obtain a minimal required difference between the numerical results and the experiment which are the shape of the welded zone and the temperature evolution in different locations. It consists in simulation of heat transfer phenomena using heat equivalent source approach and implementing in finite element software COMSOL Multiphysics. The present study is dedicated to the numerical simulation of an industrial case of hybrid laser-MIG welding of high thickness duplex steel UR2507Cu with Y-shaped chamfer geometry. The numerical simulation of heat transfer during a hybrid laser-MIG welding using equivalent heat source approachīendaoud, Issam Matteï, Simone Cicala, Eugen Tomashchuk, Iryna Andrzejewski, Henri Sallamand, Pierre Mathieu, Alexandre Bouchaud, Fréderic This leads to reduction of weld pool heat content and contraction of the heat-affected zone by 36% in comparison the same parameters obtained using a diode rectifier. It is proved that when applying inverter-type welding power sources, heat and mass transfer characteristics change, arc gap short-circuit time and drop generation time are reduced. The paper presents results the research in the effect of power sources dynamic characteristics on stability of melting and electrode metal transfer to the weld pool shielded metal arc welding. In the experimental study, we found that hybrid welding using CMT mode produced deeper penetration and sounder bead surface than those characteristics produced during only laser welding, with less heat input compared to that required in pulsed arc mode.Įffect of Inverter Power Source Characteristics on Welding Stability and Heat Affected Zone Dimensions This study has the purpose of comparing the weldability depending on the arc mode by varying the welding modes of arc heat sources in applying laser-arc hybrid welding to aluminum alloy and of implementing efficient hybrid welding while controlling heat input. Presently in shipbuilding, transportation and aerospace industries, the potential to apply welding using laser and laser-arc hybrid heat sources is widely under research. Please note - transfer of credit is always at the discretion of the receiving school.Comparison on welding mode characteristics of arc heat source for heat input control in hybrid welding of aluminum alloy Our courses meet the requirements for credit, and can qualify for credit transfer as shown below. Modules Trained Introduction to Welding Equipment and Setup ![]()
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