Self-propagating brazing heat source medicinal powder, self-propagating brazing device and preparation method thereof

Abstract

The invention discloses self-propagating brazing heat source medicinal powder, a self-propagating brazing device and a preparation method thereof. 20 to 45 mass percent of Fe2O3 powder, 10 to 30 mass percent of Al powder and 30 to 50 mass percent of CuO powder are uniformly ground to obtain heat source medicinal powder; the heat source medicinal powder is filled into a heat temperature-resistant container of which a bottom part is provided with a through hole, a brazing heat-conducting tank of which a bottom part is open is put into the heat temperature-resistant tank to squeeze the heat source medicinal powder between two containers, a brazing filler metal is positioned in the brazing heat-conducting tank, and a lead is inserted into the heat source medicinal powder. During the welding, the self-propagating brazing heat source medicinal powder is put at a to-be-welded position of a workpiece, the lead is ignited, welding powder performs thermit reaction and discharges heat to melt the brazing filler metal, and the brazing filler metal is dropped at the to-be-welded position to form a welding seam. In the invention, the welding powder is utilized to perform the thermit reaction and discharge heat to melt the brazing filler metal so as to realize welding without any welding equipment or a power supply, the welding operation is simple, convenient, rapid and safe, a thermit reaction product can be well separated from the brazing filler metal, the welding seam is relatively pure, the heat input is low, the thermal deformation of a parent metal is low, and controllability is high.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a welding method combining self-propagating welding and brazing. Background technique [0002] In the existing field emergency repairs, manual arc welding and gas welding are generally used. Both welding methods require complex and heavy equipment, and both require operators to undergo strict special training. These conditions greatly limit field operations and special places. Completion of emergency welding repair tasks under extreme disaster conditions. Therefore, it is of great significance to study the emergency and rapid repair of damaged parts under the condition of no electricity and no gas in the field. [0003] The manual self-propagating welding that has appeared in recent years uses the exothermic heat of the self-propagating reaction and its products to weld the base metal to be welded, and the flux that can undergo self-propagating reaction is made into a pen-like ...

AI Technical Summary

Problems solved by technology

Although this kind of welding rod is small and light, it can be used for welding and cutting anytime and anywhere, but because the various raw materials of this kind of welding rod are all packed in paper cylinders, the reaction product contains not only Fe, but also Al. 2 O3, therefore, there are cases where the separation of slag is not complete and there are many weld defects in the welds welded by this method

On the other hand, because the welding reaction is relatively violent, the reaction controllability is poor, and the operator holds the electrode to operate, and the welding height and angle must be accurate and require manual operation, so the requirements for the operator are high.

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