Laser scanning and laser hot wire TIG composite welding method

Abstract

The invention provides a laser scanning and laser hot wire TIG composite welding method which is formed by combining scanning laser welding and laser hot wire TIG composite welding. During welding, before a welding wire is fed into a molten pool, the welding wire is heated by low power laser, TIG electric arcs and scanning laser simultaneously act on the molten pool, and the welding wire fed into the molten pool is heated simply by very little heat. On one hand, through the preheating action of the low power laser, the melting efficiency of the welding wire is improved. On the other hand, due to the stirring action of the scanning laser on the molten pool, the temperature gradient is reduced, the solidification and crystallization process is improved, and the property of a welded joint is improved. A scanning trace can be in any forms like a circle, a sine shape and a triangle, and scanning can be carried out in a specific area and range. In addition, due to mutual intensified coupling action of laser electric arcs, the depth of fusion is increased. With the adoption of the laser scanning and laser hot wire TIG composite welding method, high quality of TIG welding is ensured, the efficiency and the welding quality are improved and the welding defects are overcome.

Description

technical field [0001] The invention belongs to the technical field of high-precision laser welding manufacturing, and in particular relates to a laser scanning combined with laser hot wire TIG composite welding method. Background technique [0002] In traditional hot wire TIG welding (Tungsten Inert Gas Welding), the welding wire is mostly heated by resistance heating, that is, the welding wire is used as a part of the circuit. When a current flows in it, the welding wire generates resistance heat, so the welding wire is preheated. This process is suitable for the welding of materials with high resistivity such as carbon steel and stainless steel, but it is difficult to apply to the welding of high-conductivity materials such as copper and aluminum. At present, in view of the large number of applications of copper, aluminum and other materials in national defense and other fields, the hot wire TIG welding technology suitable for these high-conductivity materials is undoubte...

AI Technical Summary

Problems solved by technology

However, due to the improvement of welding efficiency, the increase of temperature gradient and the coarsening of grains, at the same time, due to the fast cooling time, defects such as cracks and pores are also prone to occur, which is unfavorable to welding quality and forming

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