Study On Laser Temperature Distirbution Calculation

The thesis does the research of laser characteristic and the status of lasertemperature, using the finite element software ABAQUS and Mathematicarespectively on the tool steel surface by laser cladding wear-resisting lasertemperature and the surface of magnesium alloy laser texture to simulate, analysis oftemperature distribution. Through simulation calculation of the temperature, it mainlydiscusses the laser scanning speed and defocusing distance effect on the temperaturedistribution, and the experimental results are analyzed.By using the method of ABAQUS, the thesis comes out the result of analogcomputation, which is carrying out by analog the temperature in the tool steel surfacelaser with the process of laser cladding. The result shows that in the process of laserscanning, there is the Laser Melted Pool, which is formed in the depth direction ofsubstrate. After scanning, it is obvious to find out that the temperature range in MeltedPool is much higher. When single channel scanning, the temperature near the surfaceof spot center drop very quickly in a small range, showing that the laser cladding is aquickly cold and hot process.The faster the scanning speed, the lower the laser temperature.Under a particularscanning speed, the greater the surface distance, the lower the temperature. Aroundthe general metal melting temperature, the Melted Pool depth is shallow about0.5mm,while temperature differences in the Melted Pool gradient are larger, it is conducive toget the tiny organization structure.The depth is within0.4mm, the longer the defocusing distance, the lower theMelted Pool temperature. While the depth is more than0.5mm, defocusing distancechange has not obvious effect on the temperature. Thus further explanation in theselected conditions is that Laser Melted Pool depth should not exceed0.5mm.Assisting with the software-Mathematica, comes the analog calculation of themagnesium alloy laser texture process temperature. In the surface of magnesium alloylaser texture process, the interaction of laser and substrate material for a short time,the internal temperature of the material is not affected by temperature, which can beregarded as a semi infinite model processing. For the semi infinite model, it is moresuitable to choose the Methematica. Through the analog computation we can get theresults: in order to guarantee the effects of the laser texture, the temperature can notexceed the substrate point; the shorter the defocusing distance, the faster the scanningspeed.