SU1328120A1 - Method of welding non-rotatable pipe joints - Google Patents

Abstract

The invention relates to the field of welding, more specifically to the design of devices for welding fixed pipe joints, and can be used in the energy, chemical and other fields of engineering. The aim of the invention is to improve the formation of a seam by displacing the axis of rotation of the faceplate relative to the axis of the weldable pipe by a specified amount. The device includes a housing with a faceplate and a welding torch installed on it. The casing has holes in which the insert is fastened with the help of pins. The inset is provided with seats in the form of two parallel flat sections, the distance between which is equal to the diameter of the pipe being welded. The entire device is attached to the pipe with adjustable clamps. The device is installed on the pipe. In this case, the seats on the inserts are placed horizontally. Using clamps, expose the desired eccentricity and weld. 2 hp f-ly, 6 ill. Ш СЛ

Description

{The invention relates to welding, more specifically to the design of devices for welding fixed pipe joints, and can be used in the power, chemical and other engineering industries.

The purpose of the invention is to improve the formation of the seam due to the displacement of the axis of rotation of the faceplate relative to the axis of the pipe being welded by a specified amount.

FIG. 1 shows the device a general view; FIG. 2 is the same side view; in fig. 3 - removable insert with access points; in fig. 4 shows section A-A in FIG. 3; in fig. 5 — node 1 in FIG. 4, in FIG. 6 - node II in FIG. 3

The device includes a welding head with an annular body 1, a rotating faceplate to which the drive mechanisms and the welding torch 2 are attached, and a removable plug-in insert 3 (Figs. 1 and 2).

On each of the parts of the detachable insert 3, the seats 4 are made in the form of parallel flat sections symmetrically located relative to the diametrical plane of the housing 1. The distance between the seats 4 is equal to the diameter of the pipe 5 to be welded, and the internal diameter of the parts of the insert 3 outside the seats is larger pipe diameter by an amount not less than the eccentricity by which the axis of rotation of the faceplate must be shifted from the welding torch 2 relative to the axis of the pipe 5.

The insert is provided with tides 6, which are made detachable and through which the fingers 7 connecting the two halves of the insert (Fig. 3 and 4). Adjusting screws 8 connected with clips 9 also pass through the tides. The insert is fixed on the head body with the help of studs 10, passing w 1x through holes 11, made in the body and located around the circumference.

The device works as follows.

Using the fingers 7, connect both halves of the insert 3 on the pipe 5 to the tide connectors 6. The ends of the fingers

pinned.

The insert is positioned so that the seats 4 resting on the pipe 5 are parallel to the horizontal diameter of the joint, using

Q

5 5

0

0

five

the adjusting screws 8 move the clamps 9, setting the required eccentricity e. After that, the body 1 of the welding head is mounted on the insert 3 so that the tides 6 do not interfere with the welding (i.e., on the other side of the faceplate with the welding torch 2), and the drive mechanism faceplates would be located in the least constrained side (from the conditions of the structure to be welded). In this case, the studs 10 of the insert 3 pass through the openings of the housing 1 and nuts 12 are screwed onto the threaded ends of the fingers. After fixing the device on the pipe 5, the pipe is finally clamped by tightening the adjusting screws 8 and welded.

To do this, set the specified arc length on the horizontal section, light it and turn on the movement of the faceplate. When moving the arc around the butt of the joint, the working end of the electric arc will move eccentrically to the butt and, accordingly, the length of the arc along the perimeter of the butt will be variable: the longest ascent; metal melting.

An example. The welding head of the GNS-180 AM is completed with a detachable insert with seating places between which is 50 mm. The insert is placed inside a round hole in the head housing and the entire device is fixed on a titanium pipe S 50 mm with an eccentricity of 2 mm. pipe wall is 3 mm. The welding is carried out with a 3 mm tungsten electrode, the welding current is 120 A, the welding speed is 7 m / h. The maximum length of the open arc component in the Ascent position is 4 mm, the maximum immersion of the arc in the In Descent position is 0.5 mm. Using templates from the weld zone, it was established that high-quality welding of the entire joint takes place; there are no portions that are usual for this wall.

The use of this device allows to weld annular non-rotary joints with high-quality formation along the entire length beyond

313281

the expense of a corresponding change in the length of the arc, while ensuring quick adjustment of the welding head to the desired eccentricity.

5 Forms of invention

Claims (3)

1. A device for welding non-rotary joints of pipes, containing a ring body, a faceplate with a JO welding torch, and removable inserts fixed to the body with mounting places for mounting the device on the pipe, characterized in that, in order to improve the formation of a weld | 5, displacing the axis of rotation of the faceplate relative to the axis of the pipe being welded by a given amount, it is equipped with two pairs of clamps, the seats on the inserts are made in the form of 2Q two parallel flat sections symmetrically located relative to 204 but the diametral plane of the housing, and the presses are mounted on the inserts in pairs on either side of each flat portion with the possibility of movement relative to the housing in the radial direction. 2. The device according to claim 1, characterized in that the clamps are placed in high tides, made on the side surface of the inserts on the side opposite to the faceplate with the welding head. 3. A device according to claim 1, characterized in that holes are made in the body, located at the same distance from each other, and matching studs are fixed to the inserts at the same diameter, the distance between which is a multiple of the distance between the holes in the case. 2 FIG. H FIG. five Compiled by M. Bu New Editor S. Pekar Tehred L. Serdyukova Proofreader M. Demchik Order 3433/16 Circulation 974 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Fiyo.b