Special welding rod used for surfacing reparation of high carbon steel type high-speed railway base tamping pick

Abstract

The invention discloses a special welding rod used for the hardfacing reparation of a high carbon steel type high-speed railway base tamping pick. The coating of the special welding rod comprises the following chemical ingredients 1-3wt% of titanium dioxide, 25-35wt% of marble, 9-15wt% of fluorite, 2-4wt% of quartz, 2-4wt% of chalk, 5-7wt% of high-carbon ferrochrome, 2-4wt% of high-carbon ferromanganese, 3-5wt% of graphite, 1-3wt% of ferrosilicon, 6-8wt% of ferrotitanium, 5-7wt% of ferromolybdenum, 5-7wt% of cerium oxide, 3-5wt% of metallic nickel, 1-3wt% of ferrovanadium, 3-5wt% of tungsten carbide and 5-7wt% of ferrotungsten, and a core wire is an H08A steel core wire. Through adoption of the welding rod disclosed by the invention, the step of preheating before the welding can be avoided, and low-temperature tempering after welding is used for carrying out surfacing reparation or reproduction for the high-speed railway base tamping pick; because the surfacing metal is high-carbon steel, the surfacing surface has higher abrasion resistance and certain impact resistance and cracking resistance and the special welding rod is very convenient to use on site; the surface hardness range of the high-speed railway base tamping pick after surfacing is HRC (Rockwellhardness) 61-65; and the service life of the repaired high-speed railway base tamping pick is 2-3 times that of the integrally-manufactured tamping pick.

Description

technical field [0001] The invention relates to a surfacing welding technology, in particular to a surfacing welding electrode. Background technique [0002] High-speed railway (high-speed railway) is the development trend of railway passenger transportation in the future. High-speed railway refers to the railway with a maximum operating speed of more than 200km per hour, and EMUs are generally used. The emergence of high-speed rail poses new challenges to the design, construction, and maintenance of traditional Chinese railway subgrades. The subgrade is the basis for bearing the weight of the track structure and the load of the train, and is an important part of the railway line engineering. High-speed rail puts forward higher requirements on the smoothness and stability of the track. In addition to the basic performance of the general railway subgrade, its roadbed also needs to meet the performance requirements of the high-speed rail track for the foundation. Therefore, ...

AI Technical Summary

Problems solved by technology

[0005] At present, some people have used chromium-molybdenum-tungsten-vanadium alloy as the wear-resistant layer material for tamping pick welding. Although the material can achieve high hardness, its wear resistance is obviously not enough when it interacts with high-hardness abrasive grains; In addition, there is also the use of hard alloy brazing on the surface of the palm of the hammer to improve wear resistance.

However, due to the large difference in linear expansion coefficient between it and steel, it is easy to crack during the brazing process, and the strength and toughness cannot be reasonably matched, resulting in brittle fracture or shedding of the cemented carbide during the working process, and the effect has not been ideal.