Metal welding is one of the essential tasks in daily life. Nowadays, there are various welding techniques and methods depending on the material/metal to be welded. This article focuses on studying the principles of corner welding techniques in the flat position using traditional tools and equipment. It proposes a solution to innovate the practice of metal welding with a corner in the flat position on real equipment to a method of practice using virtual reality technology. Accordingly, the practice method will involve designing and building 3D models of traditional equipment and tools such as welding torches, current adjustment machines, ground clamps for cutting machines, protective gear, welding cable heads, etc., using 3D graphic design softwares like Unity 3D, Maya, 3Ds Max and developing virtual simulation exercises of the welding practice process in the form of visual virtual reality models using virtual reality programming languages such as Unity 3D, OpenSG, C#. The results of the article will establish a virtual practice model for corner welding in the flat position, accompanied by automatic step-by-step explanatory guidance of the welding process. At the same time, the article will also provide evaluations and analyses of the quality of the practice exercises at vocational education institutions in the Thai Nguyen province.