关键词: 激光填丝焊, 50CrV钢, 焊缝成形, 响应面法, 工艺参数

Abstract: The weld penetration should be precisely controlled at 2 mm when welding 50CrV steel plates. The response surface design method is used to meet the requirement. The experimental design of laser filler wire welding process for 50CrV steel is made by using Design-Expert 8.0 software. During the experiment, the laser power, welding speed, wire feeding speed and defocusing distance are presumed as the welding process parameters, and the specific weld penetration (2 mm), minimized weld width and weld reinforcement are considered as the process responses. Weld bead measurements are carried out to generate the response dataset of describing weld characteristics, and the mathematical models correlating the process parameters with the responses are developed. The accuracy of the established mathematical model is determined by variance test. The result shows that the laser power, welding speed, wire feeding speed and defocusing distance have significant influence on the weld bead geometry. According to the optimizated results, the laser power of 3.17-3.33 kW, welding speed of 1.30-1.40 m/min, wire feeding speed of 4.0-4.23 m/min, and defocusing distance of 3.1-4.5 mm are identified as the optimal process parameters. Under these process conditions, the weld penetration, weld width and weld reinforcement meet the welding requirement. The verification experiment shows that the predicted results are consistent with the actual welding results. Key

Key words: laserweldingwithfillerwire, 50CrVsteel, weldbeadshaping, responsesurfacemethod, processparameter