Dependence of Silicon and Manganese Content in the Weld Metal on the Welding Current and Method of Gas Shielding

Abstract

The influence of the welding current and method of gas shielding in MAG welding on the content of silicon and manganese is considered. Results of study of the welded specimens of steels 45 and 30HGSA when applying welding wire of different formulas and different types of gas shielding (traditional shielding and two-jet shielding) are given. It is established that in MAG welding the value of the welding current and the speed of the gas flow from the welding nozzle have a considerable impact on the chemical composition of the weld metal. The consumable electrode welding under double-jet gas shielding provides the directed gas-dynamics in the welding area and enables controlling the electrode metal transfer and the chemical composition of a weld.

Corrosion and Mechanical Properties of Austenic Steel Weld Joints

“…Intergranular corrosion (IGC) can be reduced if welding energy parameters are controlled by applying a high-frequency pulses [10], transition of droplets into the molten pool is regulated using a pulsed wire feed [11], inverter power sources are applied [12], the weld pool is protected with gas [13]. Welds will have a high resistance to hot cracking and intergranular corrosion if the weld metal has a two-phase austenitic-ferrite structure.…”