Welding agent for gas shielded welding of aluminium-alloy vehicle body and preparation method of welding agent

Abstract

The invention discloses a welding agent for gas shielded welding of an aluminium-alloy vehicle body and a preparation method of the welding agent. The preparation method comprises the following steps of: weighing Nocolok (KAlF4+K3AlF6 cocrystallization) and CsF dry powder according to the matching ratio of 95% of Nocolok (KAlF4+K3AlF6 cocrystallization) and 5% of CsF, stirring uniformly with a powder stirrer, then weighing polyethylene glycol with the molecular weight of being 200 as a carrier according to 20-30% of the total weight of the welding agent, mixing the polyethylene glycol and the welding agent into paste with the proper viscosity meeting spraying or painting and packaging by a plastic tank. The welding agent for gas shielded welding of the aluminium-alloy vehicle body and the preparation method of the welding agent have the advantages that not only is the oxidation film removed, but also the base material and the metal in the molten pool are protected from secondary oxidation, so that the energy inputted in arc welding is greatly reduced, the warp distortion of the base material is reduced, the splashing and the dust generation amount of the metal are reduced, andsimultaneously the welding action of the metal is enhanced and the welding quality is improved.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy gas shielded arc welding welding materials, and in particular relates to a flux used for gas shielded welding of aluminum alloy car bodies and a preparation method thereof. Background technique [0002] Flux is a substance that can melt and form slag and gas during welding, which can protect and metallurgically treat molten metal. The definition of flux is very broad, including molten salt, organic matter, active gas, metal vapor, etc. [0003] Traditional aluminum alloy arc welding relies on arcs to break the oxide film on the surface of aluminum alloys. This technology has many negative effects. Due to the high melting point of the oxide film, Al 2 o 3 The melting point of MgO is 2050°C, the melting point of MgO is 2825°C, which is nearly 5 times higher than the melting point of the base metal itself, and the structure is dense, non-conductive, and hinders the fusion between metals; the...

AI Technical Summary

Problems solved by technology

Fourth, due to the excessive heat input of the welding arc, the range adjacent to the heat-affected zone of the weld is larger and the influence is deeper, resulting in a too low strength of the heat-affected zone of the weld, which is only 60%-70% of the strength of the base metal itself. The strength of the aluminum alloy strengthened by heat treatment is reduced more, in order to maintain the bearing capacity of the workpiece in the process design, the base metal has to be thickened technologically

Fifth, due to excessive heat input, metal evaporation and dust generation increase, environmental protection and other problems occur