CN2132901Y

CN2132901Y - Melt-welding butt joint of inner wall plastic-coated steel pipe

Info

Publication number: CN2132901Y
Application number: CN 92215863
Authority: CN
Inventors: 冯逸骅
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-07-14
Filing date: 1992-07-14
Publication date: 1993-05-12
Anticipated expiration: 2002-07-14

Abstract

The utility model relates to the melt-welding butt joint of an inner wall plastic-coated steel pipe; the inner hole of the welding end of a plastic-coated steel pipe has a mouth form conical surface, and the outer edge of a combination surface has a combination welding seam. The inner side of the combination welding seam is provided with a liner ring embedded tightly at both sides in the plastic coated steel pipe. After the combination melt-welding butt joint is welded, the process of welding seam cleaning and coated plastic complementing in the pipe can be relieved; besides, under the protection of the liner ring, the welding seam can not be eroded by corrosive medium in the pipe.

Description

Melt-welding butt joint of inner wall plastic-coated steel pipe

The utility model relates to the steel pipe butt joint and melts soldered splice, is that soldered splice is melted in a kind of inwall plastic-coated steel butt joint.

After welding is melted in existing inwall plastic-coated steel butt joint, need the purge tube inside weld, and the internal plastic coating layer of scaling loss replenishes plastic-coated during to welding.This is difficult to guarantee the coating layer quality, can influence the working life of plastic-coated steel, also brings inconvenience to site operation.

The purpose of this utility model provides a kind of inwall plastic-coated steel butt joint and melts soldered splice, but plastic-coated is cleared up and replenished to plastic-coated steel dispense tube inside weld after welding, and the protection butt weld is not subjected to the tube inner corrosion erosion medium resistance.

For achieving the above object, the structure of the utility model inwall plastic-coated steel butt joint thawing soldered splice is as follows: the welding ends endoporus of inwall plastic-coated steel has enlarging shape inner conical surface.The thin walled tube inner conical surface is obtained by the steel pipe enlarging.The thick walled tube inner conical surface is obtained by giving processing.Butt weld is in the junction plane outer rim.There is grommet the butt weld inboard, tightly is embedded in the plastic-coated steel of both sides.The grommet inwall is that garden cylinder diameter is slightly less than the plastic-coated steel internal diameter.The grommet outer wall is

Shape, two ends have short garden shell of column to constitute convex shoulder to be engaged in both sides plastic-coated steel internal diameter, in abutting connection with the garden shell of column be to be attached to the garden conical surface two on the plastic-coated steel inner conical surface section of both sides outside, grommet outer wall intermediate portion is the ring surface of garden cylinder or summary indent.Different with conventional belt liner weld seam, grommet and weld seam bottom keep the gap.The inner conical surface angle of plastic-coated steel connecting end endoporus is consistent with two male cone (strobilus masculinus) angle nominal sizes on the grommet, but plus tolerance is got at the inner conical surface angle of steel pipe, and negative common difference is got at two male cone (strobilus masculinus) angles on the grommet, and it is tight to form the outside, the cooperation of middle pine.Grommet is made with corrosion resistant material or common iron plastic-coated.

Therefore the advantage of the utility model inwall plastic-coated steel butt joint thawing soldered splice is: the grommet location is arranged, and two butt joints are good by the centering of weldering plastic-coated steels; The weld seam bottom is gapped with grommet, and the heat affecting to grommet during welding is little; The weld seam contraction can make two male cone (strobilus masculinus)s of grommet and plastic-coated steel inner conical surface section chimeric tighter; Owing to can forming the plastic sealing ring that fuses at grommet conical surface place under capillary attraction, the welding heat affected steel pipe inwall coating layer that fuses stop tube inner corrosion sex work medium to ooze to the weld joint.But this butt joint thawing soldered splice dispense tube inside weld after welding is cleared up and is replenished plastic-coated.And under weld seam under the protection of grommet, can be subjected to tube inner corrosion sex work erosion medium resistance, thereby make things convenient for site operation.

The utility model is described in further detail below in conjunction with the accompanying drawing illustrated embodiment.

Fig. 1 is that soldered splice figure is melted in the butt joint of the utility model inwall plastic-coated thin-wall steel tube.

Fig. 2 is that soldered splice figure is melted in the butt joint of the utility model inwall plastic-coated thick walled steel tube.

As seen from Figure 1.The welding ends of inwall plastic-coated thin-wall steel tube 1 is done 40 ° ^{+ 3 °}Enlarging, and the bevel for welding of formation weld seam 3, butt weld 3 is in the junction plane outer rim.The inboard of butt weld 3 has grommet 2 tightly to be embedded in the both sides plastic-coated steel 1.Grommet 2 inwalls are that garden cylinder diameter is slightly less than plastic-coated steel 1 internal diameter, and grommet 2 outer walls are

Shape, two ends have shell of column 4 formation convex shoulders in short garden to be engaged in both sides plastic-coated steel 1 internal diameter, and in abutting connection with the garden shell of column is two 40 ° that are attached on the both sides plastic-coated steel 1 flared section inner conical surface ^{-2 °}The outer garden conical surface 5, grommet 2 outer wall intermediate portions 6 are the garden cylinder, butt welded seam 3 bottoms keep the gap.

The welding ends of inwall plastic-coated thick walled steel tube 11 is through giving processing as seen from Figure 2, and endoporus processes 30 ° ⁺2 enlarging shape inner conical surfaces, outer rim processes bevel for welding.The inwall plastic-coated should carry out after processing.Butt weld 3 is in the junction plane outer rim.The inboard of butt weld 3 has grommet 2 tightly to be embedded in the both sides plastic-coated steel 11.Grommet 2 inwalls are that garden cylinder diameter is slightly less than plastic-coated steel 11 internal diameters.Grommet 2 outer walls are

Shape, two ends have shell of column 4 formation convex shoulders in short garden to be engaged in both sides plastic-coated steel 11 internal diameters, and in abutting connection with the garden shell of column is two 30 ° that are attached on the both sides plastic-coated steel 11 inner conical surface sections ^{-1 °}The outer garden conical surface 5, grommet 2 outer wall intermediate portions 6 are the garden cylinder, butt welded seam 3 degree portions keep the gap.

Claims

1, soldered splice is melted in the butt joint of a kind of inwall plastic-coated steel, butt weld in the junction plane outer rim, it is characterized in that:

(1) the welding ends endoporus of inwall plastic-coated steel has enlarging shape inner conical surface;

(2) butt weld 3 inboards have grommet 2 tightly to be embedded in the plastic-coated steel of both sides;

(3) grommet 2 inwalls be garden cylinder diameter less than the plastic-coated steel internal diameter, grommet 2 outer walls are

Shape, two ends have garden shell of column 4 to be engaged in both sides plastic-coated steel internal diameter, in abutting connection with the garden shell of column be to be attached to the garden conical surface 5 outside two on the plastic-coated steel inner conical surface section of both sides, grommet 2 outer wall intermediate portions 6 are that the ring surface and weld seam 3 bottoms of garden cylinder or indent keep the gap.