Alloying Shielding Gas
Alloyed shielding gas combines reactive gases like nitrogen or helium with other gases to influence specific properties of the welding process. It controls surface hardness and thermal conductivity in the plasma.
Physicochemical Mechanism of Action
Alloyed shielding gas consists of a mixture of reactive gases like nitrogen or helium with other gases. These added gases influence the chemical environment in the plasma and can control the surface hardness of the metal. They also change the thermal conductivity, which affects the behavior of the weld during cooling.
Metallurgical Relevance & Welding Risks
The right choice and concentration of the alloyed shielding gas is decisive for the weld quality. Wrong settings can lead to uneven hardness distribution, pore formation or even hot cracks. It is important that the gas meets the specific requirements of the metal and the welding process.
Workshop Practice & Instructions
When using alloyed shielding gas, the concentrations of the added gases must be set precisely. This is done by adjusting the gas mixture in the welding machine. For certain metals or processes, special gas mixtures are specified, which are given in the manufacturer's manuals. It is important to monitor the cooling temperatures and times and adjust them if needed to ensure an optimal weld.