SU1252002A1 - Method of producing straight-seam welded pipes - Google Patents

Description

H; i () 6peTt HH (. Refers to the production of electrofusion pipes) and can be used on pipe electric welding units (TESA).

The aim of the invention is a new quality pipe.

The nature of the proposed method lies in the fact that the initial tape is first molded into the molding mill cages into a tubular tube (circular section, crimping it around the perimeter in closed gauges by 1 8 ° / o, and the tubular billet out of the forming mill welding caliber is subjected to additional compression along the perimeter on the 3., so that the welding of edges is inspected.

The amount of additional reduction of the choice according to the test data, depending on the diameter, then the wall thickness and mechanical cBoiicTB (steel grades of the formable tubular billet and the amount of compression of the welded pipe in the reduction mill, if the mill was in the pipe line. 1 welding machine. / Add, crimp a value of less leads to undermolding of the edges of the pipe bale () of the product, and more to an unacceptable reduction in plasticity, which increases the damage to the workpiece.

For ductile steel with a ratio of 10–15, an additional reduction of the formable for1H) product up to is permissible.

4 15-50 is compression

 One of the sets. left 20 - / o, and

more than 50 magnitude

D () oolnite; 1 oozhati take the minimum equal to Yu - / p and less.

With a constant wall thickness of the molded tube blank with an increase in its diameter, the amount of crimping decreases. With a constant diameter (|:) of the armored pipe — Hoif for 1 () of a pipe with a single wall, the type of wall is added, the reduction is also reasonable, 1.

Than the extremity, the strength of the metal, 1a and below 01 iosite.ping beats, p1nie, leMmenne1e should be the value of .cho, 1pieces of reduction (} 1 volt for 1 () of the product. Plastic mega, 1, 1 donus the sickness of the size of compaction.

On one and the same Irubo-electric welding unit (HE (.. L) can be used simultaneously as; 1opp, 1py compression ipy6Hoii of the noc, ie (|) form before welding, hook and known cold reduction of already welded rough |, g (lmma

Sost: | Mr. T1 or S ,. Nikulin

I l. iaKTop .L FSopoiuiuTe.hrred I. VeresKorrektor I. - rleyas

Zack (trHi i lOTirage 783Polisno.

VNIINI G () C d; f1-tnenogo Committee (. R

110 Lelama and; (oG) retonium and discoveries

I 130.3). .Moscow, F: (5, Raushsk naG). l 4i ri

Filia ,, 1I1P “Pateit. i. Uzhorol, st. Projects, 4

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five

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deformations of both processes should not exceed the maximum permissible deformation of 50 ° / o. So, if at the TESA the cold reduction of welded pipes and deformation is applied at 15%, and for this metal the maximum deformation is permissible, then the additional additional reduction of the tube billet before welding should be no more.

An example. A steel roll tape of steel 10 with a size of 96.2 X 2 mm is set in a series of successive calibers of the ethane molding stands and a tubular billet with a diameter of 32 X 2 mm is formed from it with compression in closed calibers of up to 4%. A billet of the bottom of the middle caliber of the forming mill tubular billet is subjected to cutting, 1) compression of the butt perimeter by the amount and a tubular billet with a diameter of 28 x 2 mm is obtained. The operation but the additional compression of the property. 1 are placed in a number of reduction stands installed after the molding stands 1 before a welding gauge, in which with the use of high-frequency heating they are welded to the billet to the bottom: 1: crimped tubular billet.

(e) the arch of the pipes from the above claim differs in the stability of the quality of ish, as indicated by the results of 1) the gates of pipe and pipe per floor (cottage, but the samples were kept at (l) vi) .

Example 2. Use tape pz steel 081 (1, which at TPPs. D 5 1N is molded into 12 X () ,, and .uiTCM sf () movannuk) billet is subjected to additional compression, compression set,: 1 enn () m in line agr (M ATA between the last mold) to, 1st and welding knots, 1st. Be, 1 motive doPO. 1ppt. 1N OVERALL 1) AND: (VOL. IHCT

40

so how

S (Togo V sva

rochpom k.liore agregga weld edges D () on, 1п N Lpo of the cut-up workpiece with a dimension () X P,).

The 11A.A.The proposed method for the production of alekstrosvarn |) 1x pr monyuvshlh pipes provides accurate shaping to 1hms coarsely of the i-01-ovki, paral, 1 e1 edge in welding 1.1bre, computes the rasp () P1nipness and (1zioto. the original tapes, eliminating the vertical mixing of the edges in the welder to; 1, 1bre and 1 of the forma- tion, arranged in a cBai tioro zone;

Claims (1)

METHOD FOR PRODUCING RECTANGULAR ELECTROWELDED PIPES, including forming a tape into a pipe billet with compression along the perimeter and welding its edges, characterized in that, in order to improve the quality of the pipes, the pipe billet is additionally crimped by 3-50%.