A kind of welding auxiliary activator and method for improving welding penetration nut projection welding

Abstract

A welding auxiliary activator and a nut projection welding method for improving welding penetration, 1) Firstly, powder and binder are mixed in a mass ratio of 1:4 to 6 to form an activator, and then acetone is used in a ratio of 1.5 to 3:1 Dilute the active agent, the powder includes the following components by mass percentage: carbon black 50% to 65%, CaF2 4% to 10%, TiO2 16% to 25%, Mn 15% to 27%; 2) will be made The active agent is placed in a special active agent box. 3) Install the active agent cartridge on the nut conveyor conveying structure. 4) Nut projection welding is carried out, and the nut passes through the active agent box during the conveying process, so that the nut bumps are dipped in the active agent. The invention can greatly increase the penetration depth of the weld nugget, improve the consistency of nut multi-bump welding, improve forming defects such as virtual welding and spatter, and realize high-efficiency nut projection welding. The method greatly reduces the probability of false welding, saves a repair welding process, improves welding efficiency, reduces energy consumption, saves costs, and greatly improves the welding quality of nut projection welding.

Description

technical field [0001] The invention belongs to the technical field of resistance welding, and in particular relates to a welding auxiliary activator and a nut projection welding method for increasing welding penetration. Background technique [0002] Nut projection welding is a special form of spot welding and a key technology in the body-in-white manufacturing process. It is widely used in automobile chassis, body A-pillar, B-pillar, gearbox, engine and other parts. According to statistics, on average, the cab of each car requires more than 100 bolts and nuts of various specifications to be projection welded. Nuts and bolts can be assembled by more than 90% of the body through projection welding. Nut projection welding has a great impact on the quality of vehicle assembly. big impact. Therefore, it is of great significance to develop a nut projection welding method to improve the welding penetration. [0003] Due to the very short welding time of the nut projection weldi...

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Problems solved by technology

[0003] Due to the very short welding time of the nut projection welding, the nucleation size is small, and there are multiple bumps on a nut, it is very easy to have false welding, spatter and inconsistent multi-bump welding, which directly affects the entire workpiece or even the entire vehicle in severe cases. Assembling quality, workers are sometimes required to perform secondary repair welding, which affects the assembly process

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