Reaction-Kinetic Model for the Calculation of the chemical Composition of Weld Metals in Shielding Gas Arc Welding Processes

Metallurgical reactions during arc welding are mainly influenced by the reaction partners (shielding gas, weld metal) and the reaction time (droplet transfer time). The dominant reactions already appear during the droplet state at the electrode tip and can be described by reaction kinetic models. Metallurgical reactions can be influenced by the welding equipment (power source, wire feed system) by varying the droplet transfer time. Metallurgical ractions can be controlled by the droplet transfer rate. A simple way to measure this nondestuctively is by analyzing the time dependence of welding current and welding voltage of fluctuation in the arc intensity. The measurement of droplet transfer rate should be an additional parameter for quality assurance of arc welding processes. This comprises sensors, process observation and nondestructive testing.