Laser hardening process of perforated plugs without preheating before laser cladding

Abstract

The invention relates to a laser strengthening process of a piercing plug. The laser strengthening process is characterized by firstly carrying out laser cladding on a transition alloy layer on the surface of a piercing plug matrix and then carrying out laser cladding on the high-strength alloy layer on the transition alloy layer, wherein the alloy powder adopted by the transition alloy layer is the nickel base alloy; the alloy powder adopted by the high-strength alloy layer is the cobalt base alloy. The laser strengthening process has the advantages that the transition alloy layer in the process has lower hardness than the high-strength alloy layer, plays a role in transition for the high-strength alloy layer with high hardness and high wear resistance and can well relieve the surfacing stress, so that even if the plug is not preheated or annealed, the residual surfacing stress can not have great impacts on the tissues of a laser cladding layer, thus effectively avoiding impacting the properties of the cladding layer by annealing, substantially improving the surface hardness and wear resistance of the piercing plug, simultaneously omitting the processes of preheating and annealing and also improving the production efficiency.

Description

[0001] This application is a divisional application, the application number of the original application: 201210248964.9, the name of the invention: laser strengthening process for perforated plugs, and the application date: 2012-07-18. technical field [0002] The invention relates to a laser cladding method, in particular to a laser cladding method for the surface of a perforated plug. Background technique [0003] With the increase of my country's export of seamless steel pipes, the consumption of spare parts used in the production of seamless steel pipes is also increasing year by year. The perforated plug is a key tool for producing seamless steel pipes. The quality and service life of the perforated plug have a direct impact on the output, quality and production cost of seamless steel pipes. The temperature of the perforated plug is very high when it is working, and it bears a lot of combined stress. During use, it will fail such as deformation, collapse, sticking to st...

AI Technical Summary

Problems solved by technology

The laser cladding process of the perforated plug in the prior art must preheat the plug and anneal after the surfacing to eliminate stress. Not only the process is cumbersome, the production efficiency is slow, but also the hardness of the cladding layer is reduced. there are certain problems