Nitrogen fixation device used in multi-element activated nitrogen arc welding process and method

Abstract

The invention belongs to the field of welding, and particularly relates to a nitrogen fixation device used in the multi-element activated nitrogen arc welding process and a method. The method is achieved through the nitrogen fixation device used in the multi-element activated nitrogen arc welding process. The nitrogen fixation device comprises a wire-powder synchronous conveying device, a consumable electrode gas shielded welding gun, a gas mixing device and a rotary table scraper powder feeder. Iron powder and nitride alloy powder are uniformly mixed through the rotary table scraper powder feeder, shield gases are uniformly mixed through the gas mixing device, and the alloy powder and part of parent metal at a welded seam are melted into a molten pool through electric arc heating. Alloy elements and the parent metal in the molten pool are sufficiently mixed, the molten pool is cooled and solidified, and a high-quality high-nitrogen steel welded seam can be obtained. The high-nitrogensteel welded seam processed through the device and method is high in nitrogen content, and the nitrogen content of the high-nitrogen steel welded seam is far higher than the maximum nitrogen content of a conventional high-nitrogen steel welded seam; and by adjusting the powder feeding speed, the wire feeding speed and the components of the shield gases in real time, high-nitrogen steel welded seams different in component and property can be obtained.

Description

technical field [0001] The invention belongs to the field of welding, and in particular relates to a nitrogen fixation device and method in the multi-component activated nitrogen arc welding process. Background technique [0002] High nitrogen steel is widely used in the industry because of its excellent mechanical properties, corrosion resistance and wear resistance. However, the nitrogen content of high-nitrogen steel is higher than the solubility of nitrogen in molten steel at atmospheric pressure, so that nitrogen escapes and forms pores in the weld. Therefore, in the welding process of high-nitrogen steel, if there are no additional measures, the weld will The nitrogen content will be reduced. Considering that high nitrogen steel is usually used in specific application requirements, even a small loss of nitrogen content will lead to performance deterioration. Therefore, in the welding process of nitrogen-containing steel, how to avoid the loss of nitrogen and stabilize...

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Problems solved by technology

Connect the high-pressure nitrogen protection tow shield with the melting electrode nitrogen protection torch through the clamping device. Nitrogen is usually not used for arc welding, because the dissociation energy of nitrogen is high, which will deteriorate the performance of the welding process. Only nitrogen arc is used to fix nitrogen in the weld. cause pores to appear

[0007] At present, in the field of welding, the powder feeding method using nitride in-situ metallurgical nitrogen fixation is mainly side-axis powder feeding. The powder feeding is easily affected by the direction of motion, and the cladding quality is relatively poor; when feeding the mixed powder, the uniformity of the powder of different materials is not considered. Due to the non-uniform distribution of alloying elements in the final weld; only using shielding gas for nitrogen fixation, the composition and performance of the weld will fluctuate greatly due to the change of shielding gas composition; in addition, some alloying elements will be burned during the welding process , only using protective gas for nitrogen fixation, cannot compensate for the alloying elements lost by burning

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