Tool and method for welding copper pipe and stainless steel pipe

Abstract

The invention discloses a tool for welding a copper pipe and a stainless steel pipe. The tool comprises a T-type pull rod and a baffle. An external electrode is arranged at the position, needing to be welded, of the exterior of the copper pipe, an internal electrode is arranged at the position, needing to be welded, of the interior of the stainless steel pipe, and the external electrode and the internal electrode are connected with power lines. When the copper pipe and the stainless steel pipe are welded through the welding tool, the internal electrode is extruded by a T-type head of the T-type pull rod, the pressure is transmitted to the wall of the stainless steel pipe, the pressure borne by the wall of the stainless steel pipe ranges from 1.8 Kg / cm2 to 4.5 Kg / cm2, a direct current is applied to enable discharging to be generated between the internal electrode and the external electrode, the discharging time ranges from 70 ms to 240 ms, the maximum current ranges from 18000 A to 35000 A, after welding is completed, the T-type pull rod is pushed to enable the internal electrode to be separated from the stainless steel pipe, and a completely-welded welding piece can be taken out. According to the tool, circumference welding is carried out on the copper pipe or a copper alloy pipe and the stainless steel pipe through the specially-made electric-resistance-welding welding tool and the welding technology, complete liquid-phase nuggets can be obtained, and true welding is achieved.

Description

technical field [0001] The invention belongs to the technical field of electric resistance welding, and in particular relates to a welding tool and a welding method for copper pipes and stainless steel pipes. Background technique [0002] At present, in the field of metal welding, most of the welding between stainless steel pipes and copper pipes adopts the method of flux and flame brazing, that is, adding brazing filler metal between copper pipes and stainless steel pipes and then using high temperature oxygen and acetylene. The flame melts the solder to achieve the purpose of welding, but these welding methods have disadvantages such as low efficiency, high welding cost, and poor welding environment. [0003] Resistance welding is to use the resistance heat generated by the resistance of the metal to be welded to pass through the current. When welding, a certain pressure is applied to the metal to be welded to achieve the purpose of welding. However, the melting point of c...

AI Technical Summary

Problems solved by technology

[0002] At present, in the field of metal welding, most of the welding between stainless steel pipes and copper pipes adopts the method of flux and flame brazing, that is, adding brazing filler metal between copper pipes and stainless steel pipes and then using high temperature oxygen and acetylene. The flame melts the solder to achieve the purpose of welding, but these welding methods have disadvantages such as low efficiency, high welding cost, and poor welding environment.

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