1.Firstly, the elongation of the pipe is longer than that of manual welding, usually 4-5mm is preferred. If it is too long, it will reduce the weld penetration and make the weld unattractive; If it is too short, there may be defects such as undercutting and pipe mouth damage.
2.Secondly, there is a high requirement for the cleanliness of the pipes and tube plates of welding equipment. It is best to clean the tube plate with alkaline solution or organic solution, and the tube should be polished with sandpaper until a metallic luster is visible.
3. If the surface of the welded workpiece is not clean, air holes may appear during welding, which affects the welding quality.
4. The pipe groove should not be too large. Generally, the chamfer should be ≤ 2mm, and 1mm is the best choice. If the groove is too large, it is easy to burn the pipe, and if it is too small, it can lead to insufficient penetration.
