KR970033355A - Welding method and device between metal pipes - Google Patents

Abstract

The present invention relates to a method for welding metal pipes and apparatus therefor. In the welding of conventional metal pipes, metal pipes having different polarities are joined to each other to generate a discharge, and to be press-bonded without generating beads in the welding portion. It is not only practically impossible to use, but it is necessary to use a hydraulic machine mechanism and too complicated mechanism to construct the pipe base material to flow current of different polarity to the pipe base material to be joined and to fix the pipe base material. There was an economic disadvantage. The present invention has been created to fundamentally eliminate these problems, by providing a welding support device that can be easily installed and removed inside the pipe base material to be joined to act to retain the weld metal formed during welding to oxygen It prevents oxidation by blocking contact with and prevents the deposited metal from flowing into the inside of the pipe base material so that a good back welding state and a back bead can be formed if necessary, and TIG welding In order to be able to weld without having to replace with inert gas inside, the tetrahedral block and the inverted trapezoidal block which have grooves in the longitudinal direction at the center are alternately inclined to be in contact with each other by wire A welded back support block group is formed, and on the inner surface of the back bead forming ring, a plurality of insulating bands are operated on the band. A thermal insulation layer has a band characterized in that the effective welding between the metal pie by infusion and discharge means for the installation of possible balun (balloon) in the air.

Description

Welding method and device between metal pipes

Since this is an open matter, no full text was included.

3 is a block diagram of an apparatus for welding pipe cleaning by the method of the present invention.

4 and 6 are reference cross-sectional views showing the welding process by the method of the present invention.

8 and 9 are reference longitudinal cross-sectional views showing the welding process by the method of the present invention.

10 is another embodiment of a component for applying the present invention.

11 is an enlarged reference perspective view of a component applied to the present invention.

13 is an exemplary view of the present invention.

Claims (8)

In the welding to connect the pipe base material, the regular trapezoidal block and the inverted trapezoidal block are alternately inclined to be in contact with each other to form a welded back support block group connected by wires, Inner surface is provided on the outer circumferential surface of the balloon (balloon) capable of injecting and discharging air insulation layer of a plurality of insulating bands sewn on the band; Pressing the inner diameter of the pipe base material on the outer circumferential surface of the balloon while the square trapezoid block and the inverted trapezoid block slide on the inclined side of each other by inflation of the balloon by the injection of air into the balloon. The metal pipe welding method, characterized in that for welding between the pipe base material to match the root between the center of the welding back support block group and the pipe base material. The welding method between metal pipes according to claim 1, wherein a groove is formed in a longitudinal direction at the center of said positive and inverse trapezoid block. In welding between the pipe base materials, a balloon of a predetermined size, in which air is injected or discharged according to the operator's intention, and the ends of the plurality of insulating bands 33 overlap the band 31. Insulated band layer 32 and fixed so that the trapezoidal block 35 and the inverted trapezoidal block 36, each of which has grooves 34 and 34 'formed in the longitudinal direction at the center thereof, are alternately assembled to wire ( 37) and a welded back support block group configured to move in a slide state by contacting the inclined side surface 35 'of the tetragonal block 35 and the inclined side surface 36' of the inverted trapezoid block ( 39) A welding device between metal pipes, characterized in that consisting of. 4. The metal pipe between the pipes according to claim 3, wherein the uneven parts 45 and 46 are formed on the side surfaces 35 'and 36' of the positive and inverted trapezoid blocks 35 and 36. Welding equipment. 4. The welding device between metal pipes according to claim 3, wherein the outer diameter surfaces of the positive and inverted trapezoid blocks (35) and (36) are curved surfaces corresponding to the inner diameter of the pipe base material. The welding device between metal pipes according to claim 3, wherein a taper (43) is provided so that the longitudinal edges of the positive and inverted trapezoid blocks (35, 36) have a constant angle. 4. The outer diameter of the welded back support block group 39 is determined by the size of the positive and inverted trapezoidal blocks 35 and 36 and the number of installations according to the inner diameter of the pipe base material. Welding device between the metal pipes, characterized in that. According to claim 3, The auxiliary towing wire 60 is connected to the discharge valve 49 installed in the balloon 30 to the balloon 30, and the insulation band layer 32 and the welding back support block group A wire 37 connected to the head 39 is provided with a towing wire 63 having a length longer than that of the auxiliary towing wire 60 to be connected to the main towing wire 64 together with the auxiliary towing wire 60. Welding device between metal pipes. ※ Note: The disclosure is based on the initial application.