Laser cladding process molten bath temperature online monitoring device and method

Abstract

The invention discloses a laser cladding process molten bath temperature online monitoring device and method. The laser cladding process molten bath temperature online monitoring device comprises an inert gas shielding device, a laser control system, an infrared thermometer clamp, an infrared thermometer and a servo working platform, and further comprises a data acquisition unit connected with theinfrared thermometer and a computer connected with the data acquisition unit. The method comprises the two modes of tracking monitoring and fixed-point monitoring. Through the method, tracking monitoring and online real-time display can be effectively conducted on the molten bath temperature in the laser cladding process, and the temperatures of the quick heating and quick cooling process of a certain fixed-point position can be monitored and displayed on line in real time. In the using process, different methods can be selected according to requirements. The laser cladding process molten bath temperature online monitoring device and method are novel and reasonable in design, convenient to implement and low in cost and lays the foundation for optimizing the laser cladding process and improving the laser cladding quality.

Description

technical field [0001] The invention relates to the field of online real-time monitoring of temperature in a laser cladding process, in particular to an online monitoring device and method for a molten pool temperature in a laser cladding process. Background technique [0002] Laser cladding technology refers to pre-preparing coating materials on the surface of the cladding substrate with different filler methods, and forming a surface cladding layer with good metallurgical bonding with the substrate and a low dilution rate after laser irradiation, thereby significantly improving the resistance of the substrate surface. It is a surface strengthening technology for grinding, corrosion resistance, heat resistance, oxidation resistance, etc. This technology has broad application prospects in the fields of complex parts manufacturing, aerospace, parts repair, weapons and medical device manufacturing. [0003] The laser cladding process is a complex dynamic heat conduction proces...

AI Technical Summary

Problems solved by technology

The existing side-axis molten pool temperature monitoring instrument is not designed with a special adjustable angle fixture for fixing, which will inevitably cause the monitoring instrument to shake; due to the different shapes of the workpieces, the monitoring angle cannot be flexibly designed; there are workpieces of different sizes for infrared temperature measurement The instrument needs to be reinstalled, the disassembly and assembly are cumbersome, and the efficiency is affected.

At the same time, although the current monitoring method is aimed at the temperature of the molten pool, most of the collected signals are voltage or current signals, and the maximum temperature value of the molten pool cannot be measured; there is no fixed point for the rapid heating and rapid cooling process at any point. Monitoring, which brings a relatively inaccurate theoretical reference to the closed-loop control results of the molten pool temperature in the subsequent laser cladding forming process

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