Welding method of sealing opens of metal tube member

Abstract

The invention provides a welding method for sealing of opening of metal pipe casting and comprises the following steps: A. a welding equipment work platform is provided; B. a metal pipe casting with an opening is provided; C. a plugging block matched with the opening of the metal pipe casting is provided; D. the plugging block is arranged on upward side of the opening of the metal pipe casting; E. the welding equipment is started and the metal pipe casting and the plugging block are welded together; the welding method adopted by the welding equipment is resistance welding. The welding method provided by the invention has the advantages of high welding speed, no requirement for additive packing material, easy realization of automation and high working efficiency; short heating time and energy saving due to centralized heat lead to small heat affected field and small deformation and stress, moreover, calibration and heat treatment process are not necessary to be arranged after welding, with no flue and no requirement for numerous abrading and polishing; the invention is energy saving and environmental friendly while saving material.

Description

technical field [0001] The invention relates to a welding method, in particular to a resistance welding process for sealing both ends of a metal pipe fitting. Background technique [0002] Due to the low heat conduction efficiency of traditional cast iron radiators for heating, casting and polluting the environment, steel pipes are mostly welded now. At present, the welding methods used for the sealing of the two ends of the steel pipe radiator mainly include argon arc welding, carbon dioxide welding, flame brazing and the like. Among them, the operation process of argon arc welding is to place the plugging piece at the end of the steel pipe, and through the high temperature of the arc, the place where the sealing piece and the steel pipe are in contact with each other, that is, the base material of the weld seam, is melted and welded together. The welding track is Go around the welding seam to be welded; after welding, there will be irregular burrs and bumps at the welding...

AI Technical Summary

Problems solved by technology

Among them, the operation process of argon arc welding is to place the plugging piece at the end of the steel pipe, and through the high temperature of the arc, the place where the sealing piece and the steel pipe are in contact with each other, that is, the base material of the weld seam, is melted and welded together. The welding track is Go around the welding seam to be welded; after welding, there will be irregular burrs and bumps at the welding place, which requires a lot of grinding; in addition, it is necessary to continue to energize for a period of time during welding to make the welding seam The base metal of the metal remains in a state of high-temperature melting for a certain period of time, which increases a lot of energy loss; at the same time, because the metal material at the weld is in a state of high-temperature melting, it is easy to oxidize with the air during welding, resulting in A lot of smoke and harmful gas

The welding method of carbon dioxide welding is the same as that of argon arc welding, but it will also be filled with welding wire, and the filler material will be melted to connect the weld while welding. Since part of the filler material will be burned during welding, the smoke and harmful gas produced will be more Many, a lot of grinding is also required after welding

Copper solder is added during flame brazing, and a lot of polishing and grinding work is required after welding. There will also be a lot of smoke and harmful gases during the welding process, and the welding speed is slow and energy-consuming materials are consumed.

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