Simulation of Wind Influence on the Thermal Processes in Gas-Shielded Welding

Abstract

A set of various factors and phenomena defines the quality of welded joints. This is especially noticeable for outdoor welding. A numerical simulation of welding processes with consumable electrode with traditional and two-jet gas shielding was carried out to study the influence of wind speed on the movement of the shielding gas (CO2) and the change of thermal processes in the heat affected zone. It is established that the use of two-jet shielding in welding with a consumable electrode leads to an increase in hardness of the shielding gas stream and lower offset of thermal fields in the welded product in the wind direction. It testifies to a better quality of shielding and smaller probable changes in symmetry of structure formation and mechanical properties of the heat affected zone.

Study of Wind Velocity Impact upon the Quality of Shielding and upon the Thermal Processes under MAG Welding

“…When the wind velocity increases up to 10 m/s traditional gas shielding is carried downwind and the thermal fields change abruptly, i.e. we observe considerable runaway of heat from the welding area leading to asymmetry and alteration of weld and HAZ metal properties [13][14][15]. In case of two-jet gas shielding we observe shielding gas being carried away and displacement of thermal fields in the arc zone but the thermal picture of the item remains practically unaltered.…”

Development of Executive Equipment Design for Implementing the Process of Generating of Drops of Microand Nanoscale Range

“…Currently, one of the most promising areas for the implementation of various technological processes is mathematical modeling. It is based on the construction of a model created by means of computer simulation of various physical and technological processes [1][2][3][4][5][6][7]. Development of various models that are as similar as possible to natural processes is very important in the case when setting up a natural experiment is impossible, very difficult or very expensive.…”

Controlling the Depth of Penetration in the Case of Surfacing with a Strip Electrode at an Angle to the Generatrix

“…The stability of penetration can be ensured by additional technological measures to increase the efficiency of the surfacing process, such as improving the protection of the weld pool [2,3] and controlling the formation of the penetration zone in welding [4] and surfacing [5,6]. Are known works devoted to control the transfer of electrode metal into the weld pool when surfacing with a wire under influence of shielding gas [7,8], by impact of longitudinal magnetic field [9]; in [10] an example of the use of controlled mechanical transfer during surfacing with stripe electrode is given.…”