Self-protecting dot and bead welding wire with metal core

Abstract

The present invention belongs to the field of welding technology, and is applied mainly in the dot and bead welding for coal milling roller, mill roller and boiler pipeline. The self-protecting dot and bead welding wire has a metal core comprising high carbon ferrochromium 40-60 wt%, ferromolybdenum 5-15 wt%, Si-Mn alloy 5-15 wt%, ferrotitanium 2-5 wt%, Al-Mg alloy 2-5 wt%, ferroboron 2-5 wt%, except Fe powder. The self-protecting dot and bead welding wire has low cost, and may be used in automatic operation to form high quality welded point.

Description

technical field [0001] The invention discloses a self-protective metal core spot surfacing welding wire, which belongs to the field of welding in material processing engineering. The invention is mainly used in spot surfacing wear-resistant protective coatings of coal grinding rolls, cast iron cold (hot) rolls, and boiler pipes. Background technique [0002] Cold (hot) rolls are generally made of cast iron. Because of their poor weldability, it is difficult to surfacing on the surface. If the commonly used low-carbon steel electrodes or wires are used, their bonding strength and wear resistance will be affected. Foreign countries with advanced technology are all committed to developing their own special electrodes and wires for surfacing welding of cast iron roller shells, and formulating corresponding welding processes, which have achieved good results and have been widely used. Since the early 1990s, my country has carried out preliminary research in this area and gained s...

AI Technical Summary

Problems solved by technology

Ventilation is required in the production process of existing spot surfacing, which cannot realize continuous operation, and the solder joints produced by surfacing welding are prone to defects such as undercuts and pores

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