A non-electric welding flux suitable for emergency welding maintenance of low-carbon steel sheet parts below 5mm and a welding pen containing the flux

Abstract

The invention relates to a non-electric welding agent applicable to emergency welding repair of low-carbon steel thin-walled sheet parts below 5mm. The welding agent is formed by mixing powdery thermite, slagging constituents, alloying agents and thinners. The welding agent generates the self-propagating reaction after being ignited, the thermite in the welding agent reacts to generate heat for maintaining reaction and also provide enough heat to enable parent metal to melt, and the metal part generated by the thermite and the melting part of the parent metal jointly form a molten bath to be subjected to metallurgic reaction at high temperature; the slagging constituents and Al2O3 generated by the thermite jointly form slag low melting point and viscosity, the slag is effectively separated from metal ingredients in the molten bath, Al2O3 is taken out, and the defect of slag inclusion in weld metal is overcome; alloy ingredients in the alloying agents enter the molten bath at high temperature generated by the thermite and participate in the metallurgic reaction of the molten bath jointly, so that the weld metal has the ideal microstructure and reasonable mechanical property; the thinners are used for adjusting the self-propagating reaction speed and reaction temperature of the welding agent, so that operation is convenient.

Description

technical field

[0001] The invention relates to the field of emergency welding, in particular to an electroless welding material suitable for low-carbon steel sheet parts below 5mm. This material is based on self-propagating technology and realizes electroless emergency welding through self-propagating flux reaction. Purpose. Background technique

[0002] Welding technology plays an important role in machine manufacturing, petrochemical, aerospace and electronics industries, especially in the field of field emergency repairs, for fractures and cracks (cracks) in construction machinery, pipelines, boxes, profile structural parts, etc. Among the repair methods for failures such as cracks, holes, etc., the use of welding to repair accounts for a large proportion. Utilizing the principle of self-propagation, the implementation of field non-electric welding maintenance can solve the problems of lack of external energy, heavy equipment, and poor mobility in the field, and can be ...

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