Influence of Protective Gas Content on Quality of Welded Joint While Welding With Impulse Supply of Electrode Wire

Currently one of the advanced ways of obtaining quality welded joint while welding of medium alloy martensitic-bainitic steel is the one with impulse supply of electrode wire in gas mixture Ar(70%±3%)+СО2(30%±3%). Results of experimental studies proved that application of protective gas Ar(70%±3%)+СО2(30%±3%) in comparison with СО2(100%) enables to increase strength properties of the welded joint by 10-15% and enlarge the transitioncoefficient of chemical elements

Enhancing a service life of torch components for MIG/MAG welding

The paper analyzes the main vulnerable elements of torches used in mechanized gas-shielded welding. Particular attention is given to the gas nozzle designs, materials they are made of, and other welding torch elements exposed to increased electrical and thermal stresses during the welding process

Systems to Control Molten Metal Transfer in Arc Welding

The paper analyzes the systems used for controlling molten wire metal droplets during the arc welding process in shielding gases. The variations for implementing the relevant systems are given, with the positive and negative aspects of such implementation taken into account. Electrical systems are currently investigated to the fullest extent possible and implemented in different power sources for pulsed welding arc. Mechanical systems are represented by different types of feeders that provide the pulsed wire feeding process. The feed mechanisms driven by electric motors and electromagnets are analyzed. In addition to the mechanical and electrical systems, the examples of combined control systems are given

Mathematical Model of Motion of Modifying Powder Particles in the Shielding (Carrier) Gas

The paper gives some consideration to the model of including ultradisperse modifiers into the surface layer of material through the shielding (carrier) gas. It has been revealed this technique of inclusion necessitates ultradisperse particles to be 100 - 150 nm for their efficient transfer by the shielding (carrier) gas. Particles of smaller dimensions can't get in a jet of the shielding (carrier) gas. Probability of such defect as "impurity" occurs provided that particles are over 150 nm