Application of combined laser processing in welding of heat-treated parts

International Workshop "Advanced Technologies in Material Science, Mechanical and Automation Engineering – MIP: Engineering – 2019"

材料科学;机械制造;原子能学

Ogin, P.^1

Togliatti State University, Belorusskaya St. 14, Togliatti, Russia^1

关键词: Advanced designs;    Assembled camshafts;    Axisymmetric structure;    End connections;    Induction method;    Laser machines;    Precision machines;    Technological feature;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/537/3/032028/pdf
DOI  :  10.1088/1757-899X/537/3/032028

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The article deals with the questions of the end connections of heat-treated precision machine parts having a low stiffness, in particular, assembled Camshaft cars. To reduce the residual stresses that occur when welding heat-treated parts, it is proposed to perform preheating of heat-treated elements in the welding zone using a laser. Also, to reduce the deformations that may occur when welding axisymmetric structures with low stiffness, such as assembled Camshaft, it is proposed to use pulsed laser welding, and welding is performed only on the site previously processed by the previous laser. A laser machine based on two sources of laser radiation DLR-200-AC and YLR 150/1500-QCW-AC was used for experimental studies. The technological heads of lasers are coaxially arranged and have a single output lens, this allowed to calculate the processing program and the necessary laser power for the first and second laser source in a single technological window, as well as to synchronize the work of two laser sources. As samples were used assembled Camshafts, which consisted of a shaft with a Central hole, and heat-treated Cams. The shafts were made of steel 20 (WNr 1.0402), Cams of steel 40X (WNr 1.7034). Heat treatment of Cams was carried out by induction method. Analytical and technological features of processing are described. The cyclic combined process is described. The result is shown. Using the proposed methodology it is possible to use the technology of connecting axisymmetric parts with low stiffness both at the stage of analysis and modernization of existing designs, and at the stage of development of advanced designs.