Influence of Nanostructured Powder Modifiers on the Structure of a Welding Bead

Abstract

Addition of nanopowders of tungsten and aluminum oxyhydroxide to the weld pool has shown positive effect on the structure of metal during arc gas welding with a consumable electrode. It has been shown that introducing the powders decreases dendrite size and leads to the formation of a more equilibrium micrоstructure.

Effect of Protective Coatings in Welded Constructions on Welding Stability and Electrode Metal Transfer into a Weld Pool in MMA

“…Oscillograms of current in a welding circuit, voltage between an electrode and an item, recorded when MMA with protective coatings (Figure 2) were processed statistically and presented in Table 1. As seen in Table 1, there is 5-11% increase in time of a droplet transfer and 10-12 % rise of cycle duration (period of its formation and transfer), it suggests that electrode metal is transferred in bigger drops [9][10][11][12][13][14][15][16][17][18]. This regularity is possible since protective coatings deposited on edges to be welded form a film, which is a layer between an electrode and an item, being important for welding stability.…”

Influence of Nanopowders on Corrosion Resistance of Welded Joints

“…This paper offers the new method for the corrosion resistance increase for welding joints. This method includes gas-shielded welding of separate parts using a metered introduction of nanosized particles into the molten pool with the use of a device, described in [8].…”

Method of Determining the Optimal Concentration of Nanostructured Powders in Shielding Gas

“…Анализ результатов исследований показал, что на-плавленный металл состоит из трех слоев, структура которых существенно различается [18]. Толщина слоев различна при разных вариантах наплавки.…”